Software Engineer

About the Position

We are looking for a Software Engineer with expertise in Python and FastAPI to join our team in Białystok, Poland. This role is a CONTRACTOR position offering a competitive salary of 6000-8000 PLN per hour.

Responsibilities

• Designing, developing, and implementing agentic AI solutions using LangGraph and AWS services
• Building low-code automations (Copilot Studio, Power Automate) where they add value alongside pro-code solutions
• Owning assigned solution streams across 1–2 projects, ensuring production readiness
• Collaborating closely with cross-functional teams to deliver scalable AI solutions
• Maintaining and improving deployed components, ensuring reliability and performance

Requirements

• Strong expertise with at least 2 years of experience in agentic AI frameworks, including LangGraph (state graphs, conditional routing, and checkpointing as mandatory capabilities) and LangChain for building chains, memory, and custom tools
• Hands-on experience with AWS or any cloud and AI platforms such as AWS AgentCore and AWS Bedrock, covering model invocation, guardrails, and knowledge base integration
• Proven capability in building end-to-end RAG pipelines, including chunking, embeddings, retrieval, evaluation, and working with vector databases like Pinecone, ChromaDB, OpenSearch, and FAISS
• Solid backend engineering skills with production-grade Python, leveraging FastAPI, async/await, Pydantic, and type hints to build scalable services
• Experience working across multiple LLM providers such as OpenAI, Claude, Gemini, and Llama, with a clear understanding of their trade-offs and best-fit use cases
• Strong communication skills in English

Nice to Have

• Deep experience with AWS AgentCore components such as runtime, memory, and tools gateway
• Exposure to MCP / A2A protocols and agent-to-agent communication patterns
• Enterprise system integrations, including SAP HANA and Salesforce
• Document intelligence solutions involving OCR and layout-aware chunking
• Familiarity with evaluation frameworks (RAGAS, Promptfoo, DeepEval) and cloud certifications (AWS, GCP, Azure AI/ML)

We Offer

• Diverse portfolio of clients
• Wide portfolio of technologies
• Employment stability
• Remote work opportunities
• Contracts with the biggest brands
• Great Place to Work Europe
• Many experts you can learn from
• Open and accessible management team

About the Company

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.