AI Developer - LLM Applications

ReaktorHelsinki

On-site Full-time

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Experience Level

Experience

Qualifications

Essential Skills:Experience with AI software development technologies (LLMs, backend, frontend, ops, consulting). Knowledge of deploying AI applications in cloud environments (Azure, AWS, GCP). Familiarity with containerization and orchestration (Docker, Kubernetes).

About the job

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 Developer

As 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 Profile

You 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.

About Reaktor

Reaktor is a forward-thinking technology company that fosters a vibrant community of tech enthusiasts. We are dedicated to harnessing the power of AI to develop solutions that improve real-world situations. Our culture is founded on collaboration, innovation, and the continuous pursuit of excellence.

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Mar 9, 2026

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Full-time|On-site|Mapbox Helsinki

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Software Development Engineer I - Android Auto Integration

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Full-time|On-site|Mapbox Helsinki

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Jan 26, 2026

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Engineering Manager - Partner Platform Development

Aiven

Full-time|On-site|Helsinki, Uusimaa, Finland

Join a global team of over 400 innovators at Aiven, where we are at the forefront of open-source technology and multi-cloud solutions. Our mission is to empower developers and creators to turn their ideas into reality with unparalleled speed and simplicity by providing an accessible cloud data platform that supports open-source databases, search, streaming, and application infrastructure for all.Your Role:We are in search of a proactive and outcome-focused Engineering Manager to lead our Partner Platform Development team. This position emphasizes customer engagement and satisfaction while balancing the diverse needs of various stakeholders to craft an effective roadmap for our partners. Reporting to the Director of Partner Product & Engineering Management, you will serve as the vital connection between our engineering teams and partners, ensuring smooth delivery and nurturing collaborative relationships.As the leader of the Partner Platform Development team, you will spearhead the technical execution of both existing and complex new partner integrations, acting as the primary engine for our growth. This role merges technical leadership with operational excellence, as you will manage an exciting pipeline of new regional launches, service extensions, and crucial platform upgrades while working closely on the overarching product roadmap.

Mar 5, 2026

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Staff Software Engineer - Platform Development

Aiven

Full-time|On-site|Helsinki, Finland

Aiven is seeking a Staff Software Engineer focused on platform development in Helsinki, Finland. This position centers on designing and building scalable solutions that support Aiven’s cloud services. Role overview This engineer will work closely with cross-functional teams to strengthen the platform’s performance, reliability, and security. The work includes both designing new features and improving existing systems to meet the demands of a growing cloud infrastructure. What you will do Design and implement scalable solutions for Aiven’s platform Collaborate with teams across engineering, product, and operations Focus on maintaining high standards for performance, reliability, and security Requirements Strong background in software engineering Experience working on complex challenges in platform or cloud development Comfort working in a fast-paced setting

Apr 29, 2026

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Full-Stack Software Development Engineer II

Mapbox

Full-time|On-site|Mapbox Helsinki

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.

Dec 9, 2025

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