AI Developer - LLM Applications

Reaktor's award-winning tech community is looking for AI developers to join us in Helsinki.

If you thrive on applying cutting-edge AI technologies, building LLM-powered applications, and driving projects through the full software development lifecycle — and you’re passionate about solving real human problems with a holistic approach — we’d love to meet you. Join us to experience a truly collaborative, low-hierarchy environment where your curiosity and ideas can make a real impact.

##
As an AI Developer at Reaktor, your job is to be an expert in a range of AI-related software development responsibilities spanning the entire software development lifecycle, from front-end to production.

Your daily tasks include:

• Designing and implementing end-to-end LLM-enabled applications from backend architecture to user-facing components, ensuring scalability and maintainability.

• Integrating commercial and open source LLMs (e.g. OpenAI, Anthropic, Meta Llama etc.) into production applications and workflows, using APIs or fine-tuning.

• Working with end-to-end RAG pipelines, including embeddings, vector databases (e.g. PostgreSQL + pgvector, chromaDB, pinecone), robust prompt engineering strategies and guardrails

• Designing and implementing evaluation pipelines to benchmark the model performance and safety

• Collaborating with cross-functional teams, contributing to the development of AI use cases to address complex business challenges

• Working together with the client’s tech and business teams and helping them to pick the right technologies suitable for their needs.

• Delivering the client and the team with world-class technical expertise.

• Developing the agentic software development process and ways of working, to better leverage the use of AI.

• Other software development-related tasks like contributing to the overall software architecture and design, building test automation and debugging problems.

You are a curious-minded AI developer who is comfortable working with LLMs, backend, and front-end of an application. Additionally, you understand the role of infrastructure and understand the underlying workings of transformer-based models.

To thrive in this position, you’ll need:

• Experience working with AI software development technologies (LLMs, backend, frontend, ops, and consulting skills) in a production environment.

• Experience in deploying AI applications in cloud environments (Azure, AWS, GCP) with containerization/orchestration (Docker, Kubernetes)

• We don’t have a hard limit on years of experience, but we’ve noticed that some of these competencies take several years to accumulate.