Full Stack Developer at Reaktor | Helsinki

Join Reaktor's award-winning tech community as a Full Stack Developer in Helsinki!If you thrive in a collaborative environment and possess a passion for tackling complex challenges through innovative software solutions, we want to hear from you. Our low-hierarchy culture fosters creativity and encourages you to contribute to all stages of the software develo…

Join Our Award-Winning Tech Community as a Lead Developer in Helsinki!About the RoleAs a Lead Developer at Reaktor, you will be instrumental in guiding your team through the full software development lifecycle. Your leadership will ensure successful project outcomes while fostering a collaborative and innovative environment.Key Responsibilities:Serve as the primary technical liaison for clients, addressing queries and ensuring high-quality deliverables.Collaborate effectively with client tech and business teams, facilitating communication among stakeholders to guarantee excellence in delivery.Develop and implement new features across front-end applications, back-end servers, and databases, ensuring the necessary infrastructure is in place to support your team.Enhance team performance by empowering members to explore optimal workflows and achieve a healthy work-life balance.Cultivate strong relationships with clients to ensure ongoing collaboration.Support your team in adopting and adhering to agile methodologies.Who You AreYou are an adept developer who thrives on tackling technical challenges and excels at providing clarity in uncertain situations.Qualifications:A minimum of eight years of diverse experience across back-end, front-end, and operations.Strong grasp of agile project management principles.Demonstrated experience in team leadership and consulting roles.Proven capability in collaborating with multiple client stakeholders to resolve complex challenges.Familiarity with at least one widely-used server-side programming language, with a preference for TypeScript/JavaScript and Node.js, though Java/Scala/Kotlin, Clojure, and Python are also considered.Strong knowledge of at least one client-side language and framework, preferably TypeScript/JavaScript with React, and mobile frameworks such as Swift, Java/Scala/Kotlin, or React-native.Competency in creating new back-end services and managing CI/CD pipelines as required by projects.Familiarity with database management, particularly PostgreSQL.

Join Reaktor's award-winning technology community as a Full-Stack Software Developer in Helsinki!Are you passionate about navigating the full software development lifecycle? Do you thrive on solving real-world problems through a comprehensive approach? If you enjoy working in a flat organizational structure, you may be the perfect fit for our team.Your Role as a Full-Stack Developer at ReaktorAs a Full-Stack Developer, you will be responsible for a wide range of software development tasks, from front-end design to back-end production processes.Your daily responsibilities will include:Collaborating with client technology and business teams to identify and implement suitable technological solutions.Adding new features that necessitate modifications to frontend applications, backend servers, and databases, and occasionally infrastructure.Providing exceptional technical expertise to clients and team members.Engaging in additional software development tasks, including debugging, architectural design, and implementation.Who You AreYou are an inquisitive developer with proficiency in both backend and frontend application development and a solid understanding of infrastructure's role in your daily activities.To excel in this role, you will need:A diverse skill set across software development practices, including backend, frontend, operations, and consulting experience.While there is no strict experience requirement, most candidates typically accrue these competencies over several years.Experience with at least one popular server-side programming language; our projects frequently utilize TypeScript/JavaScript and Node.js, but also Java, Scala, Kotlin, Clojure, and Python.Strong proficiency in at least one client-side language and framework; common technologies include TypeScript/JavaScript and React for web applications, and Swift, Java/Scala/Kotlin, or TypeScript/JavaScript React Native for mobile applications.The relevant skills to create new backend services and establish CI/CD pipelines when required.A foundational understanding of DevOps principles, including Continuous Integration (CI), automated deployment, and test automation.Familiarity with databases, such as PostgreSQL.

Join Reaktor’s award-winning technology community as a Full Stack Software Engineer in Helsinki!If you thrive in an environment where you can navigate the entire software development cycle, enjoy tackling complex human-centered challenges, and seek a collaborative, low-hierarchy workplace, you may be the perfect fit for our team.As a Full Stack Software Engineer at Reaktor, you will take on a diverse range of software development responsibilities, covering everything from frontend design to backend production.Your key responsibilities include:Collaborating closely with clients’ technical and business teams to identify and implement the most suitable technologies for their needs.Developing new features that may involve modifications to frontend applications, backend servers, and databases, as well as infrastructure enhancements.Providing exceptional technical expertise to both the client and the team.Engaging in other software development activities, including debugging, design, and architecture creation.The ideal candidate is a curious developer comfortable with both backend and frontend technologies and understands the significance of infrastructure in daily operations.To excel in this role, you’ll need:Experience across various software development modalities, including backend, frontend, ops, and consulting capabilities.No strict requirement for years of experience, but in-depth knowledge typically comes with years of dedication.Proficiency in at least one popular server-side programming language. Many of our current projects utilize TypeScript/JavaScript and Node.js, alongside Java, Scala, Kotlin, Clojure, and Python.Strong familiarity with at least one client-side language and framework, with frequent use of TypeScript/JavaScript and React for web applications, and Swift, Java/Scala/Kotlin, or React Native for mobile applications.Relevant skills to develop new backend services and create CI/CD pipelines as needed.A foundational understanding of DevOps practices, including Continuous Integration (CI), automated deployments, and test automation.Knowledge of databases, such as PostgreSQL.

Join Reaktor's award-winning technology community as a Senior Full Stack Software Engineer in Helsinki.Do you thrive in a low-hierarchy environment and have a passion for addressing human challenges through innovative software solutions? If so, we want to hear from you!Your Role:As a Senior Full Stack Software Engineer, you will be at the forefront of the software development lifecycle, bringing expertise in both front-end and back-end technologies, as well as infrastructure management.Key Responsibilities:Collaborate with clients' tech and business teams to select optimal technologies tailored to their requirements.Develop and implement new features encompassing changes to frontend applications, backend servers, and databases, including infrastructure modifications.Provide world-class technical guidance to clients and team members.Engage in software development tasks such as debugging, designing, and contributing to architectural decisions.Your Profile:We are seeking a curious and versatile developer who is proficient in both backend and frontend development and appreciates the significance of infrastructure.Required Qualifications:Proven experience across various software development domains (backend, frontend, operations, and consulting).While we do not enforce a strict years-of-experience requirement, the skills we seek typically take time to develop.Experience in at least one popular server-side programming language (TypeScript/JavaScript and Node.js preferred, but Java/Scala/Kotlin, Clojure, and Python are also relevant).Strong proficiency in at least one client-side language and framework, with a preference for TypeScript/JavaScript and React for web applications, and Swift, Java/Scala/Kotlin, or TypeScript/JavaScript React-native for mobile projects.Ability to design new backend services and establish CI/CD pipelines as necessary.Foundational knowledge of DevOps practices, including Continuous Integration, automated deployment, and test automation.Familiarity with databases such as PostgreSQL.

Join Reaktor's Renowned Tech Community as a Mobile Developer!If you are passionate about mobile development and excel at tackling intricate challenges within multidisciplinary teams, we encourage you to consider joining us in Finland (Helsinki, Tampere, Turku). At Reaktor, we foster a low-hierarchy environment that promotes creativity and collaboration.Your responsibilities will include:Creating native mobile applications for both iOS and Android.Engaging directly with clients and stakeholders to clarify project requirements in a collaborative team setting.Making significant contributions to architectural decisions and guiding the long-term technical strategy.Participating in discovery, conceptualization, and iterative delivery processes, beyond mere implementation.Occasionally extending your contributions beyond mobile development to adopt a full-stack approach when beneficial to the project.To excel in this role, you should possess:Extensive experience in at least one mobile ecosystem (iOS/Android), typically requiring around 6 years of professional development experience.Solid practical knowledge of technologies such as: Swift, UIKit, Reactive Programming, Java, Kotlin, depending on your ecosystem.Experience with SwiftUI is a valuable addition.A strong sense of ownership in testing: You will take responsibility for the entire development cycle, ensuring features are defect-free and delivered to users.Prior experience in monitoring and troubleshooting production applications.A keen interest in developing refined animations in collaboration with a Motion Designer.We also value the following qualities:A consultative mindset with experience in engaging multiple stakeholders to unravel complex, ambiguous challenges.Familiarity with full-stack development.References to well-known, high-traffic consumer applications that are currently available for download.Fluency in verbal and written English to collaborate effectively in our international setting. Proficiency in Finnish is considered an advantage.

Join Tieto Tech Consulting as a Full-Stack Developer, where you will play a vital role in designing and implementing innovative software solutions. Collaborate with cross-functional teams to deliver high-quality applications that meet client needs.

Join Reaktor's Award-Winning Tech Community as an AI Developer!Are you passionate about leveraging advanced AI technologies to create innovative LLM-powered applications? Do you excel in navigating the complete software development lifecycle? If you're eager to tackle real-world challenges with a holistic approach, we invite you to connect with us. Experience a collaborative, low-hierarchy environment where your ideas and curiosity can drive meaningful change.Your Role as an AI DeveloperAs an AI Developer at Reaktor, you will take on a pivotal role, mastering various AI-related software development tasks that span from front-end design to production implementation.Key Responsibilities:Crafting and deploying end-to-end LLM-enabled applications, focusing on backend architecture and user-facing components to ensure scalability and maintainability.Integrating both commercial and open-source LLMs (such as OpenAI, Anthropic, Meta Llama) into production applications using APIs or fine-tuning techniques.Engaging with end-to-end RAG pipelines, including embeddings, vector databases (like PostgreSQL + pgvector, chromaDB, pinecone), and robust prompt engineering strategies.Developing and implementing evaluation pipelines to measure model performance and ensure safety.Collaborating with cross-functional teams to create AI use cases that address complex business problems.Partnering with client tech and business teams to identify the most suitable technologies for their needs.Providing world-class technical expertise to clients and team members.Contributing to overall software architecture and design, including test automation and debugging tasks.Your ProfileYou are a curious AI developer adept in working with LLMs, backend and frontend technologies, with a solid understanding of infrastructure and transformer-based models.Qualifications Required:Proven experience in AI software development technologies including LLMs, backend, frontend, and operational skills within a production setting.Experience in deploying AI applications in cloud environments (Azure, AWS, GCP) with containerization and orchestration tools (Docker, Kubernetes).Strong problem-solving skills and a proactive approach in technology selection suitable for project needs.

Role overview Reaktor is hiring a Hands-on Software Architect in Helsinki. This position centers on designing and building scalable software systems. The architect works closely with cross-functional teams, guiding technical conversations and helping set the direction for digital product development. What you will do Design and implement software architecture for a range of projects Lead architecture discussions and decisions with development teams Work alongside colleagues from different disciplines to deliver quality products Mentor developers and support their technical growth Contribute directly to codebases and technical problem-solving Influence the evolution of Reaktor's technology stack Requirements Proven experience designing and implementing scalable software systems Ability to lead technical discussions and make architectural decisions Interest in mentoring and collaborating with developers Curiosity about new technologies and approaches This role is based in Helsinki.

Join Aiven, a dynamic global team of over 400 professionals dedicated to redefining the landscape of open-source technology and multi-cloud solutions. Our mission is to empower developers, builders, and creators by providing a fast and straightforward cloud data platform that makes open-source databases, search, streaming, and application infrastructures readily accessible.The Role:We are seeking a Senior Full Stack Engineer to become a vital member of our PostgreSQL Developer Experience team. This team is on a clear mission: to simplify modern application development, backed by the world’s most resilient Postgres database.As a full-stack engineering specialist, you will translate complex PostgreSQL features into elegant, user-friendly interfaces for developers. You will act with urgency and a proactive mindset, exercising sound judgment to balance innovation, risk, and opportunity with release timelines and project scopes.Our back-end systems are primarily developed in Python, with components in Go and C, while the front end utilizes React and TypeScript.In this role, you will not only execute tasks but also shape the PostgreSQL experience for developers, making it enjoyable, discoverable, and easy to adopt.What You’ll Do:Deliver End-to-End Developer Experience: Own the technical implementation throughout the entire user journey—from onboarding and data migration to ongoing usage, developer satisfaction, and growth opportunities.Build Intuitive Interfaces: Design and develop front-end applications, dashboards, and developer tools that facilitate the seamless adoption and use of PostgreSQL.Obsess Over Usage Data: Analyze and monitor product usage to understand developer behaviors, identify friction points, and drive data-informed enhancements.Experiment & Iterate Quickly: Work in agile cycles, delivering prototypes and features swiftly to test adoption and enhance the user experience.Work Across a Modern Codebase: Collaborate on a technology stack where back-end systems are primarily Python, with modules in Go and C, and the front end is built with React and TypeScript.Champion Quality at Speed: Produce high-quality, maintainable code while embracing agility and rapid iteration, and participate in technical planning to steer architectural decisions.Collaborate Cross-functionally: Partner with back-end engineers, product managers, and design teams to foster a cohesive development environment.

At Mapbox, we are revolutionizing the way location data is utilized through our cutting-edge real-time location platform, empowering businesses to integrate location-awareness seamlessly. Our platform is favored by over 4 million developers for its unmatched flexibility, security, and privacy compliance, enabling organizations to craft unique and engaging experiences for their customers.About The Data Tooling TeamThe Data Tooling team plays a critical role in managing and enhancing Mapbox’s global basemap content, ensuring our customers receive the most accurate and up-to-date Live Map of the world. We leverage advanced data processing pipelines and proprietary tools to validate millions of data updates monthly, address thousands of weekly user feedback inputs, and transform user telemetry into actionable insights.We are on the lookout for a skilled Full-Stack Software Development Engineer to join our dynamic team, where you will take charge of advancing our mapping tools and capabilities.As AI integration becomes ever more crucial in modern engineering practices, we value engineers who can thoughtfully incorporate AI into their design, development, and decision-making processes. Your interview will include discussions on how you leverage AI in your engineering workflows.

Join Our Award-Winning Tech Community as a Lead Software Engineer in Helsinki! Your Role: As a Lead Software Engineer at Reaktor, you will navigate the entire software development lifecycle, empower your team to excel, and drive impactful results. Your Daily Responsibilities Include:Acting as the primary technical contact for clients, addressing inquiries and ensuring delivery quality.Collaborating with the client's technical and business teams to foster effective communication and guarantee high-quality outcomes.Implementing new features involving modifications to front-end applications, back-end servers, and databases, while understanding necessary infrastructural support.Enhancing team workflows by encouraging optimal processes and balancing work-life dynamics among team members.Cultivating strong client relationships to facilitate ongoing collaboration.Guiding your team in adopting agile methodologies seamlessly. Your Profile: You are a seasoned developer who thrives on technical challenges and excels at providing clarity in uncertain situations.To Succeed in This Role, You Should Have:Extensive experience across various domains (back-end, front-end, and operations). Typically, a minimum of eight years of relevant experience is desired.A strong grasp of agile project management principles.Prior experience in both team leadership and consulting roles.Proven ability to engage with multiple client stakeholders to address complex issues.Familiarity with at least one popular server-side programming language. Currently, many of our projects utilize TypeScript/JavaScript and Node.js; however, Java, Scala, Kotlin, Clojure, and Python are also in our technology stack.Strong proficiency in at least one client-side language and framework, with TypeScript/JavaScript and React commonly used for web apps, and Swift, Java, Scala, Kotlin, or React Native for mobile applications.Relevant skills to create new backend services and refine CI/CD pipelines as project needs dictate.Knowledge of databases, such as PostgreSQL.

Tietoevry is seeking Integration Developers and Architects for the Tieto Tech Consulting team in Helsinki. The main focus is on creating and delivering integration solutions that help streamline and enhance business operations. Collaboration with colleagues from various backgrounds is a key part of the work, ensuring that different systems communicate effectively across platforms. Key responsibilities Design integration solutions that address specific business requirements Implement integrations to boost process efficiency Collaborate with cross-functional teams to ensure smooth connections between platforms Location This role is located in Helsinki.

At Two, we are at the forefront of revolutionizing B2B commerce by reimagining payment processes for businesses. Our goal is to integrate the speed, simplicity, and customer-centric approach of B2C e-commerce into the B2B realm, alleviating barriers in business transactions and fostering growth for both merchants and buyers.Utilizing real-time credit assessments, seamless checkout experiences, and sophisticated risk evaluations, we empower sales processes that are faster, smarter, and more efficient. With an impressive 30% month-over-month growth and operations spanning Europe and the United States, we are rapidly scaling and are poised to establish ourselves as the premier B2B payment solution globally by 2027, aiming to become one of the next Nordic unicorns.Supported by renowned investors such as Sequoia Capital, Shine, LocalGlobe, Antler, and respected fintech angels, we have successfully raised over €40 million in equity thus far. And we're just getting started!About The RoleWe are seeking ambitious and proactive Sales Development Representatives to join our dynamic Commercial team. In this role, you will be instrumental in driving market share across the Nordics and broader Europe while also aiding our expansion into new strategic markets as we continue our growth trajectory.As an SDR at Two, you'll serve as the initial point of contact for prospective customers, helping them recognize the value of Two’s offerings and contributing to our go-to-market strategy. Your responsibilities will include generating and qualifying leads, scheduling discovery calls, and collaborating closely with our Sales Managers and Chief Commercial Officer to develop robust regional pipelines.This is a remarkable opportunity to become part of one of Europe’s most promising fintech scale-ups and directly influence our commercial success.Location:This position can be based in our office hubs in Oslo, Stockholm, or London, or it can be fully remote from Helsinki.Please note that visa sponsorship is not available for this role.What You’ll DoInitiate contact with potential customers via phone, email, LinkedIn, and other channels.Assess inbound and outbound leads and arrange discovery meetings for Sales Managers.Develop a comprehensive understanding of Two’s products, customer segments, and value propositions.Collaborate with the broader commercial team on outreach strategies and enablement content.Conduct market research to effectively identify and qualify target industries, verticals, and buyers.Maintain precise records of all prospect interactions in our CRM system.What We OfferThe chance to shape and scale a high-impact commercial function.Competitive base salary with an uncapped performance-based bonus structure.Stock option plan.Flexible working options – remote or hybrid, tailored to your preference.Access to modern office hubs in Stockholm or Oslo.

Tieto Tech Consulting seeks an AI Developer in Helsinki to design and deliver artificial intelligence solutions for diverse client projects. This position involves both building new AI applications and applying existing technologies to meet specific business needs. Key responsibilities Create and implement AI-driven tools and applications for client use Contribute to projects that use AI to solve practical challenges for organizations Work closely with colleagues to design, test, and improve AI models About Tietoevry Tietoevry applies technology expertise to help organizations tackle complex problems and encourage innovation.

At Mapbox, we lead the way in real-time location solutions, empowering a new generation of location-aware businesses. Our platform provides organizations with a comprehensive suite of tools to facilitate the navigation of individuals, packages, and vehicles worldwide. Over 4 million developers trust Mapbox for its flexibility, security, and adherence to privacy standards. With our applications, data, SDKs, and APIs, businesses create tailored and engaging experiences that resonate with their users.What We DoThe Maps API team focuses on building and sustaining the infrastructure and applications that generate and distribute Mapbox maps. Thousands of clients depend on our services to manage billions of daily requests, scale seamlessly during global events, and enable designers, developers, and analysts to craft and share innovative maps.Delivering maps requires a constantly evolving model of the world, adept at accommodating various edge cases such as writing systems, fonts, local regulations, and global boundary disputes.Our team upholds the highest-traffic read APIs at Mapbox, alongside distributed ETL pipelines utilized by both internal and external clients to transform data into maps. We’re committed to developing novel methods for visualizing location data.As AI becomes increasingly integrated into engineering workflows, we seek engineers who can thoughtfully weave AI into design, development, and decision-making processes. Expect discussions during the interview process about your use of AI in engineering.

airapps is looking for a React Native Engineer to join the team in Helsinki. This position centers on building mobile applications that are scalable and responsive, with a strong emphasis on user experience and thoughtful design. What you will do Develop and maintain mobile apps using React Native Work closely with colleagues to design and implement new features Keep applications responsive and high-quality Apply mobile development best practices throughout the project lifecycle Requirements Experience with React Native Solid understanding of mobile development principles Comfort working in a collaborative team setting Interest in building applications that enhance user experience Location This role is based in Helsinki.

What does it mean to be a Consultant at Netlight?At Netlight, our consultants engage in vital projects that drive digital transformation. Our mission is to unlock the full potential of our clients and ourselves. You will play a crucial role in shaping the software products and technical solutions of the future, collaborating closely with both colleagues and clients. We believe in customizing roles to fit individual strengths, interests, and market demands. Here, you will have the freedom to chart your career path, select your projects, and define your role. You will benefit from mentorship, coaching, and networking opportunities to facilitate your personal and professional development. The scope for growth is limitless!Our focus extends beyond just digital products; we aim to create a positive impact on teams and businesses. Our projects cover a broad technical spectrum, including Fullstack Development, Backend, Data Science & Engineering, Cloud Solutions, Architecture, Web Development, AI solutions, DevOps, and more.

Join Mapbox, the premier platform for real-time location services that empowers a new wave of businesses focused on location awareness. We provide organizations with a comprehensive suite of tools designed to facilitate the navigation of people, packages, and vehicles globally. With over 4 million developers leveraging our platform, Mapbox is renowned for its flexibility, robust security measures, and adherence to privacy regulations. Our applications, data, SDKs, and APIs allow businesses to craft unique and engaging experiences that captivate their customers.The Role of Maps RenderingAt Mapbox, the Maps Rendering team is at the forefront of transforming interactive mapping and real-time visualization on the web. We develop and enhance Mapbox GL JS, the leading rendering engine that delivers dynamic, high-performance maps to millions of users daily. Our endeavors intersect graphics programming, large-scale data visualization, and pioneering browser technology.Your ContributionsAs a Software Development Engineer III, you will:Spearhead the development of mapbox-gl-js, recognized as the leading map rendering solution in the industry.Collaborate with engineers, product managers, and design teams to define a visionary roadmap for the future of map rendering.Utilize modern web technologies such as WebGL, WebGPU, Web Workers, TypeScript, and WebAssembly.Tackle complex challenges in graphics, algorithms, and system architecture.Enhance performance, reliability, and maintainability across our rendering technology stack.Collaborate with Native and Mobile rendering teams to ensure seamless cross-platform experiences.Key Traits for SuccessA strong passion for unraveling complex technical challenges in the realms of graphics, mapping, and data visualization.Proficiency in TypeScript, algorithms, and performance optimization techniques.Exceptional communication and teamwork skills within distributed, cross-functional teams.A growth-oriented mindset, showcasing empathy, receptiveness to feedback, and a desire to foster success in others.Preferred QualificationsExperience in graphics programming, including OpenGL and WebGL.Familiarity with large-scale data visualization and performance tuning.

Join Reaktor's Award-Winning Tech Community as a Platform Engineer!We are on the lookout for a talented Platform Engineer to become a vital part of our Industrial Business Unit in either Helsinki or Tampere. If you have a passion for designing and constructing large-scale cloud platforms, engaging in hands-on infrastructure as code (IaC), continuous integration and delivery (CI/CD), and ensuring robust security and observability, we want to hear from you!As a Platform Engineer at Reaktor, your primary responsibility will be to architect, develop, and manage secure, scalable, and cost-effective cloud platforms that align with our product teams and client business needs.You will collaborate closely with Reaktor teams to provide consultation and support for infrastructure automation and DevOps practices. This role may involve creating new infrastructure and platforms or integrating existing systems with what our clients currently employ.Become a part of our Industrial Business Unit, where you will be instrumental in supporting our clients in this dynamic field.Your Daily Responsibilities Will Include:Designing, implementing, and maintaining Azure cloud environments, utilizing the latest best practices and technologies to help product teams deliver exceptional solutions.Ensuring security and compliance are integral to everything you develop.Facilitating scalable and resilient infrastructure that adapts to demand, ensuring reliable digital service operations.Identifying opportunities for cost-efficiency while maintaining performance and reliability.Automating routine tasks to allow engineers to focus on higher-value projects.Advocating for standardization through common tools, processes, and configurations to enhance maintainability and accelerate development cycles.Acting as a trusted advisor by closely collaborating with product teams and stakeholders to understand their infrastructure needs.Supporting Reaktor’s Industrial Business Unit in sales and proposal activities as an infrastructure expert.You will thrive in this role if you enjoy transforming complex, fragmented infrastructure into streamlined, scalable platforms that empower teams to operate swiftly and reliably.