Senior Backend Engineer at Kiefer | Athens

Join Kiefer Tech, a pioneering force in the technology sector, where we harness over 12 years of engineering expertise from the Green Energy domain to craft innovative AI, robotics, and enterprise solutions throughout Greece and the EU. Our mission is to construct sovereign AI infrastructure that upholds data privacy within EU borders while driving substanti…

Join Kaizen Gaming as a Senior Backend Engineer and be part of a dynamic Agile team dedicated to crafting innovative solutions for millions of users worldwide. Collaborate with cross-functional teams to drive impactful projects, from user-facing applications to robust backend services, ensuring high performance and reliability. Your expertise will guide the development of scalable systems, turning complex requirements into elegant technological solutions.

Join our team as a Senior Backend Engineer (Python) and engage in a challenging project that focuses on data-intensive processing, system integration, and semantic technologies. In this pivotal role, you will take charge of an established codebase, enhancing its stability and evolving it to meet the project’s demands. This position is perfect for seasoned engineers who thrive in working with complex systems and have a solid grasp of data-driven architectures.Key Responsibilities:Thoroughly analyze and take ownership of an existing Python-based backend.Refactor and optimize backend components with an emphasis on maintainability and performance.Develop and sustain data processing pipelines and integration workflows.Collaborate closely with data and semantic engineers on RDF/SPARQL-driven processes.Contribute to the architectural redesign and technical documentation.Assist with deployment, configuration, and troubleshooting tasks.Ensure high code quality through rigorous reviews, testing, and adherence to best practices.Requirements:A minimum of 3 years of professional experience in backend development.Expertise in Python programming.Experience with:Apache Airflow and AWS.Data-intensive or integration-heavy systems.APIs, batch processing, and backend services.Configuration-driven systems (XML / JSON / YAML).Strong understanding of:Software architecture and design patterns.Debugging and maintaining legacy codebases.Proven experience in complex, multi-stakeholder projects (experience in EU or public-sector projects is a plus).Preferred Qualifications:Familiarity with Semantic Web technologies (RDF, SPARQL, OWL).Experience in data modeling or knowledge-based systems.Exposure to DevOps practices (CI/CD, containerization).Experience in contributing to or maintaining technical documentation (e.g., AsciiDoc, Antora).Benefits:We value talent and commitment, offering the following perks:Attractive full-time salary.Private health insurance under the company’s group plan.Flexible working hours.Access to top-quality tools.Opportunities for professional development, including language courses and specialized training.Career advancement potential by collaborating with leading specialists in the field.A dynamic work environment that encourages personal and professional growth.If you're ready for an exciting challenge, we would love to hear from you!

Join Skroutz, where our mission is to deliver extraordinary experiences. Since our inception in 2005, we have believed that satisfied customers lead to satisfied merchants, driving us to understand and fulfill their needs while providing a seamless shopping journey.Our ambition is to transform into the Everyday App, the preferred platform for millions to meet their online shopping requirements. From the latest smartphone to essential pantry items, stylish outfits, or collectible gaming consoles, Skroutz is your reliable partner for effortless shopping.With aspirations that extend beyond Greece, we are on the path to becoming one of Europe's fastest-growing Marketplaces, with exciting ventures underway in Cyprus and the Balkans. Our commitment to customer satisfaction shapes every decision we make.We are looking for passionate individuals who thrive in the intersection of e-commerce and technology. If your drive is to create remarkable shopping experiences for users while enabling sellers globally to thrive, we want you on our team.At Skroutz, be a part of a transformative journey that redefines online shopping. Together, let’s turn everyday moments into exceptional experiences.Are you ready for the challenge?#AimToAmazeOur Engineering ValuesMaster your craft and take pride in your work.Deliver early and iterate based on feedback.Collaborate and be proactive within your team.Avoid over-engineering and focus on simplicity.Enjoy the process and celebrate achievements.Technologies We UseOur primary stack includes Ruby for backend development, utilizing the Ruby on Rails framework, alongside Javascript (ES6) and React/Redux for frontend. We leverage a MariaDB cluster for storage, with extensive use of Elasticsearch, Kafka, MongoDB, Redis, and Memcached. Jenkins is our go-to for CI, and we utilize tools like Sentry, DataDog, and Grafana for monitoring purposes. We consistently seek the most effective tools tailored to our needs. Discover more about our projects on our Engineering blog.Your Contribution to Skroutz's VisionWe are searching for Senior Backend Software Engineers with a robust technical background...

Join Our Journey at Welcome!Established in 2015 in Athens, Greece, Welcome is revolutionizing travel experiences by offering more than just a transfer service. We are pioneers in delivering a comprehensive and personalized journey for travelers from their arrival to their departure. Welcome Pickups caters to every travel need, providing seamless transfers, engaging sightseeing tours, and invaluable local insights in the most user-friendly and personalized manner. Our drivers are not just transporters; they are local experts who enhance travelers' experiences, making them feel at home no matter where they are. Our commitment to safety is paramount, featuring contactless rides, stringent cleaning protocols, and protective equipment for every journey.As a rapidly growing travel tech startup, Welcome is quickly establishing itself as a global leader in in-destination travel services.Rated 4.9/5 stars, we are among the highest-rated global transportation companies.We service over 300 destinations with plans to expand to 350 by 2024.Our network includes over 4,000 travel partners, including 2,500 hotels and numerous vacation rentals, welcoming over 50 new partners each month.We delight over 2.5 million travelers annually.⭐ Dive deeper into the culture of Welcome by visiting our TikTok account.⭐About Our TeamOur team is a vibrant mix of diverse individuals passionate about travel and dedicated to quality. Each member is committed to Welcome's vision and works tirelessly to achieve it. We think outside the box, prioritize design and usability, and strive to create unforgettable experiences. We are committed to continuous learning and personal and professional growth while maintaining a humble, 'pay it forward' mindset and ambitious goals.Role OverviewAs a Backend Software Engineer, you will play a pivotal role in transforming our vision into tangible products. Your contributions will directly impact the travel experience for users, drivers, and partners. You will be responsible for enhancing our tech infrastructure and optimizing the code that powers our production servers, ensuring a flawless user experience.In the past 18 months, our full-stack approach has yielded remarkable results. Our engineers focus primarily on back-end development, working on logic, APIs, and databases, while also having the capability to build functional UI using React.

The Sportsbook Area within Product Development is expanding rapidly, and we are on the lookout for a talented Backend Software Engineer to join our world-class Sportsbook team. Our platform, meticulously crafted in-house, is gaining traction not only in new markets but also as a B2B offering. With our product available globally, we provide around-the-clock support to enhance the experience for users betting on various sports.Our Product Development organization boasts a truly global presence, featuring cross-functional teams across five Tech Hubs: Malta, Budapest, Stockholm, Tallinn, and Athens. Life at Betsson Group is akin to a thrilling rollercoaster ride—fast-paced, full of unexpected turns, and always exhilarating. Our diverse team of over 2,800 colleagues from more than 75 nationalities collaborates daily to tackle new challenges and seize opportunities for growth. If you thrive in an innovative environment and enjoy pushing boundaries, you will find your place among us.As a vital member of our Sportsbook tech team—a high-performance group focused on delivering optimal functionality and user experience in the iGaming sector—you will play a key role in ensuring our platform meets the demands of our brands serving over 20 different markets. Join us in our mission to create unmatched performance and functionality in the industry!

At Skroutz, we are driven by a straightforward mission: to amaze our customers. Since our inception in 2005, we've believed that satisfied customers lead to satisfied merchants. Our goal is to understand and anticipate customer needs, providing them with an unparalleled and worry-free shopping experience.Our vision is ambitious: we strive to be the Everyday App, the ultimate platform where millions can satisfy their online shopping desires. Whether you’re in search of the latest smartphone, replenishing pantry staples, finding the ideal outfit for an occasion, or hunting down that elusive gaming console, Skroutz is your reliable partner for effortless shopping.Our aspirations extend well beyond Greece. We are on track to become one of Europe’s fastest-growing marketplaces, with exciting expansions already taking place in Cyprus and the Balkans. Our unwavering commitment to customer satisfaction drives every decision we make.To fulfill our vision, we are in search of individuals who share our enthusiasm for e-commerce and technology. If you are motivated by the desire to create extraordinary shopping experiences for our users and assist sellers worldwide in growing their businesses, we would love to have you on our team.Join us at Skroutz and be part of a transformative journey that is redefining online shopping. Together, let’s turn everyday moments into extraordinary experiences.Are you ready to embark on this challenge?#AimToAmazeOur Engineering ValuesMaster Your Craft: Develop and refine your technical skills, and take pride in your work.Release Early & Iterate: Launch prototypes swiftly to gather critical feedback and refine based on insights. Don’t hesitate to make adjustments and revisit to enhance.Be a Team Player: Offer assistance, listen, and seek to comprehend. Take initiative and be proactive.Avoid Over-Engineering: Steer clear of unnecessary complexity or regulation.Enjoy Your Work: Celebrate achievements along the way.Technologies We UseOur primary tech stack includes Ruby for backend development, utilizing the Ruby on Rails framework, along with JavaScript (ES6) and React/Redux for frontend development. We operate on a MariaDB cluster for storage and utilize Elasticsearch, Kafka, MongoDB, Redis, and Memcached extensively. Jenkins is employed for CI, while tools like Sentry, DataDog, and Grafana are used for monitoring. We strive to select the best tools available to meet our needs. To learn more about our projects, visit our Engineering blog.Your Contribution to Skroutz's Vision

Join the dynamic team at Finartix as a Senior Software Engineer specializing in .NET technologies. We are seeking a motivated and talented Backend Application Developer to contribute to our Software Engineering Practice. You will play an essential role in designing, implementing, and managing innovative technology-driven solutions that enhance our clients’ operational efficiency across various sectors. Key ResponsibilitiesEngage in the complete software development lifecycle including designing, testing, and maintaining bespoke applications.Adhere to established programming standards for naming conventions, security, performance, and ensure comprehensive code documentation.Act as a trusted technical advisor to clients, offering solutions tailored to their needs.Provide ongoing support to both business and IT users for existing applications.

Join Kaizen GamingAt Kaizen Gaming, the driving force behind Betano, we are proud to be one of the leading GameTech companies globally, with operations spanning 20 diverse markets. Our commitment lies in leveraging state-of-the-art technology to deliver unparalleled experiences for millions of customers who rely on us for their entertainment.Our vibrant team consists of over 2,700 talented individuals from more than 40 nationalities across three continents.Recognized as one of the Best Workplaces in Europe and certified as a Great Place to Work in all our offices, we guarantee that no two days will ever be the same. Are you ready to Press Play on Your Potential?About the RoleAs a Backend Engineer, you will be an integral part of an autonomous Agile team, collaborating closely with the Product Owner, Agile Delivery Lead, Automation Testers, and fellow Software Engineers to create a competitive edge for Kaizen and provide an exceptional online experience for our customers.At Kaizen, our software engineers are entrusted with a variety of projects, ranging from customer-facing websites and mobile applications to internal tools and backend services, all designed to handle high traffic and volume.Your ResponsibilitiesDevelop innovative solutions from the ground up, guiding them from concept to production.Transform requirements into efficient and sophisticated technological systems, leveraging our large-scale, highly available infrastructure.Design, build, and maintain efficient, reusable, and reliable code.Explore new technologies to identify effective solutions for everyday challenges.Deliver high-value features rapidly.Question the status quo and drive improvements for both the team and the product.Technology StackOur platforms primarily utilize C# / ASP.NET, with new services developed in .NET Core. Contemporary applications employ Vue.js for the frontend, while legacy systems utilize server-rendered (Razor) views combined with jQuery and Knockout.js. We predominantly rely on MS SQL Server for data storage, supplemented by Redis and ElasticSearch when applicable. RabbitMQ serves as our primary message broker, and we use GitLab for code versioning and continuous integration, alongside the Atlassian suite for issue tracking and documentation.

IKH is a globally recognized leader in Software & Robotics Solutions, renowned for our innovative approach to digital transformation. In just a few years, our dynamic team has expanded by over 80%, and we have relocated to a modern, spacious office to accommodate our growth. As we embark on numerous exciting projects in 2026, we are eager to welcome a skilled Backend Developer to our team to tackle challenging outsourced projects.Key Responsibilities:Execute complex project tasks with precision.Utilize Waterfall implementation methodologies effectively.Translate client requirements into robust functionalities.Collaborate closely with the architecture team to align solutions with client needs.Integrate applications with developed modules and external systems.Support deployment and configuration management activities.

Are you excited about the power of Artificial Intelligence? At Satori Analytics, we are dedicated to transforming industries through innovative Data & AI solutions. Our mission is to empower global brands by providing unparalleled clarity and insights, utilizing cutting-edge technologies. Our diverse range of services spans from developing cloud-based ecosystems for fintech to creating predictive models for the airline industry, covering the entire data lifecycle—from data ingestion to AI implementation.As a rapidly expanding scale-up, our talented team of over 100 professionals—including Data Engineers, Data Scientists, and other tech experts—delivers pioneering analytics solutions for various sectors, including FMCG, retail, manufacturing, and financial services. Join us as we spearhead the data revolution in South-Eastern Europe and beyond!Ready to collaborate with one of Greece's largest energy companies?Your Daily Responsibilities:Design, construct, and maintain backend services that address real-world business challenges, guiding projects from concept to production.Engage in the complete software development lifecycle—from gathering requirements to deploying and managing systems in a live environment.Monitor, diagnose, and enhance production systems and cloud infrastructure utilizing observability tools.Work closely with product teams and stakeholders to translate business requirements into precise, actionable technical solutions.

Welcome to Kaizen Gaming!At Kaizen Gaming, the driving force behind Betano, we are proud to be one of the leading GameTech companies globally, actively operating in 19 diverse markets. Our mission is to harness cutting-edge technology to deliver exceptional experiences to millions of customers who rely on us for their entertainment needs.Our vibrant team consists of over 2,700 Kaizeners from more than 40 nationalities, spread across three continents.As a recognized Best Workplace in Europe and a certified Great Place to Work, we promise that no two days will be the same. Are you ready to Press Play on your potential?About the Role:As the Lead Software Engineer, you will be instrumental in guiding a talented team of software engineers in crafting and delivering top-tier software products. Your leadership will involve overseeing project execution, mentoring team members, and ensuring adherence to engineering best practices. This role seamlessly combines technical acumen with leadership and communication skills to drive both team and organizational success.

Join the dynamic team at FINARTIX as a passionate Backend Application Developer. Contribute to innovative projects across various sectors, playing a vital role in developing, implementing, and managing technology-driven business solutions that enhance our clients' delivery approaches. Key Responsibilities Engage in the complete software development lifecycle, including the implementation, testing, and maintenance of custom applications. Adhere to established standards for programming, security, and performance while ensuring thorough code documentation. Act as a technical consultant to clients, providing expert advice and support. Assist both business and IT users with existing applications to ensure optimal performance. QualificationsBachelor's or Master's degree in Computer Science, Engineering, or a related field is required.A minimum of 3 years of experience in Software Engineering.Strong proficiency in Backend Engineering with the .Net Framework.Hands-on experience with various database technologies, including SQL, NoSQL, and Vector.Familiarity with Web Services (SOAP/REST) and Application Servers (IIS).Understanding of system frameworks such as Git and Azure DevOps (ADO), as well as container technologies like Docker or Kubernetes.Previous experience in Infrastructure Architecture and support is a plus.Cloud Services certification (AWS, Azure, GCP) is an added advantage.Exceptional programming skills and a creative approach to problem-solving.Excellent communication and time management skills.Proficient in both English and Greek, with strong written and verbal capabilities.BenefitsProfessional development through engaging, real-world projects across diverse industries.Work within a rapidly-growing technology company with esteemed partners.Opportunity to collaborate with talented colleagues in a diverse environment.Competitive salary package.Comprehensive private health insurance.Access to training and development opportunities.Company laptop provided.Flexible work environment.

Join Us at Kaizen Gaming!Kaizen Gaming, the driving force behind Betano, stands as one of the leading GameTech companies globally, thriving in 19 markets. Our mission is to harness innovative technology to deliver unparalleled experiences to the millions of customers who entrust us with their entertainment needs.We pride ourselves on our diverse workforce of over 2,700 Kaizeners from more than 40 nationalities across 3 continents.As a recognized leader in workplace culture, we are honored to be listed among the Best Workplaces in Europe and certified as a Great Place to Work across our offices. Here, you won't encounter an average day. Are you ready to Press Play on Your Potential?About the RoleIn this pivotal role, you will become part of an autonomous Agile team, collaborating closely with the Product Owner, Agile Delivery Lead, Automation Testers, and fellow Software Engineers to carve out a competitive edge for Kaizen and deliver a distinctive online experience to our users. Alongside your Agile team, you will also engage with a talented cohort of backend professionals within our Backend Chapter. As a Senior Backend Engineer, you will:Take charge of a variety of projects ranging from customer-facing websites and mobile applications to internal administrative tools and robust backend services designed to handle high traffic and volume.Own the development lifecycle of our applications, ensuring an engaging journey from start to finish.Design and implement innovative solutions, steering them from ideation through to production.Translate complex requirements into clean, sophisticated technological systems, leveraging our large-scale, highly-available infrastructure.Be a key contributor in designing, building, and maintaining efficient, reusable, and reliable code.Explore and research new technologies to identify efficient solutions for everyday challenges.Deliver high-impact features rapidly and effectively.Challenge conventional approaches to enhance both team dynamics and product quality.Our Tech StackOur platforms and services predominantly utilize C# / ASP.NET, with newer services developed in .NET Core. Our frontend applications leverage either Vue.js or Angular, while legacy systems employ server-rendered (Razor) views combined with jQuery. Microsoft Orleans facilitates our scalable and resilient distributed applications, with MS SQL Server serving most storage needs, alongside Redis and ElasticSearch where appropriate. RabbitMQ is our preferred message broker, and we utilize Gitlab for version control and CI.

Our Core Values: Trust | Respect | Team SpiritOur Key to Success: The exceptional individuals on our team, whose integrity and skills set us apart!We are on the lookout for an experienced Senior DevOps Engineer to join our innovative team. The ideal candidate will possess extensive hands-on experience with cloud technologies, automation, containerization, and application development. You will be instrumental in designing, deploying, and sustaining scalable solutions while collaborating with cross-functional teams.Position Overview:Your daily responsibilities will encompass:Designing, implementing, and maintaining CI/CD pipelines utilizing Azure DevOps / Azure Pipelines and Jenkins.Managing containerized applications with Docker or Podman.Deploying applications in RHEL Linux environments.Developing and maintaining automation scripts using Python.Configuring and sustaining JBoss / WildFly application servers.Building and managing applications based on Spring Boot and Node.js.Overseeing builds and dependencies with Maven.Working with Oracle databases and managing schema updates using Liquibase.Collaborating with development teams to ensure secure, reliable, and efficient deployments.

Join our dynamic team at Netcompany A/S as a Senior System Engineer. In this pivotal role, you will leverage your technical expertise to design, implement, and maintain advanced systems that drive our operations forward. You will work closely with cross-functional teams to ensure the seamless integration of technology solutions that meet business needs.Your contributions will be vital in optimizing system performance and enhancing user experience. If you are passionate about technology and innovation, we invite you to apply and be part of our mission to deliver excellence.

We are seeking a highly skilled Senior DevOps Engineer to join our dynamic team at Netcompany1. In this pivotal role, you will be responsible for implementing and maintaining scalable and efficient infrastructure solutions that support our development and operational processes. You will collaborate closely with software engineers and IT teams to automate processes and improve system reliability.Your expertise in cloud services, containerization, and CI/CD pipelines will be key in driving our projects forward and enhancing our DevOps practices. If you are passionate about technology and thrive in a fast-paced environment, we would love to hear from you!

Founded in 2018, Causaly is revolutionizing enterprise-scale scientific research with its advanced AI platform, enhancing human productivity. Our innovative technology empowers researchers to discover, visualize, and interpret biomedical knowledge while automating essential research workflows, driving progress against significant global health challenges.We collaborate with some of the largest biopharmaceutical companies and institutions worldwide, addressing diverse use cases in Drug Discovery, Safety, and Competitive Intelligence. To learn more about how we facilitate knowledge acquisition and enhance decision-making, explore our informative blog posts here: Blog - CausalyOur company is backed by leading venture capital firms, including ICONIQ, Index Ventures, Pentech, and Marathon.

We are seeking a talented and experienced Database Engineer to join our dynamic team at Netcompany1. In this role, you will be responsible for designing, implementing, and maintaining robust database systems that support our innovative projects and applications. You will have the opportunity to work with cutting-edge technologies and collaborate with cross-functional teams to deliver high-quality solutions.

Join our dynamic team at Kiefer Tech, the technological arm of Kiefer, renowned for over 12 years of pioneering work in the Green Energy sector. We are at the forefront of developing innovative AI, robotics, and enterprise solutions across Greece and the EU. Our commitment to crafting sovereign AI infrastructure ensures that data remains within EU borders, prioritizing privacy while delivering measurable business outcomes. Guided by our core principles of innovation, quality, and long-term partnerships, we create enterprise-grade AI frameworks, including Greece’s first authentic Large Language Models and intelligent automation solutions that empower organizations to succeed. Our strategic alliance with NVIDIA enhances our sustainable infrastructure expertise with world-class AI technology, fostering an ecosystem of innovation that bolsters Greece’s technological sovereignty and generates significant impact across various industries. Become a part of our mission to build the AI-powered world of tomorrow.We are on the lookout for a Senior QA Engineer to help establish robust testing methodologies and ensure product reliability in preparation for our enterprise launch.