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. - Foundational knowledge in DevOps, including Continuous Integration (CI), automated deployment, and test automation. - Know-how on vector databases and databases (e.g., PostgreSQL + pgvector, pgvectorscale, chromaDB, pinecone). - Awareness of data privacy (GDPR), security and ethical considerations when handling sensitive data with AI. - To be comfortable engaging with the client stakeholders when needed. - Fluent verbal & written Finnish and English skills. RE: Technologies in our projects - Some projects require proficiency in Python or Node.js/TypeScript, including experience with frameworks like LangChain, FastAPI or LlamaIndex. - Some projects require JVM-based languages. - Our philosophy is that tech is a tool. This role is quite new to the industry and there will be some grey areas when it comes to exact techs in our projects. Do not let lack of a specific technology hinder you from applying to this job. Why join us? For two decades, we’ve been developing qualities and capabilities for adapting, reacting, and supporting change – building Reaktor to hold up in a fast-paced environment while ensuring the well-being of our people. At Reaktor, you'll have the opportunity to work across a range of industries, such as Healthcare, the Public Sector, Industrial and Retail. You might al