Senior Fullstack Engineer, Python, React
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Job Description
Senior Fullstack Engineer building Python and React GenAI applications for Bonapolia’s enterprise clients. Developing AWS agents, scalable APIs, and retrieval-augmented systems.
Responsibilities:
- Develop, test, debug, maintain, and continuously improve Python-based applications and services
- Deploy and configure applications and services in AWS environments
- Provision and manage infrastructure using Infrastructure as Code while considering system performance and cloud costs
- Work with PostgreSQL using pg_vector or search technologies such as OpenSearch or Elasticsearch for vectorized custom data and Retrieval-Augmented Generation use cases
- Design and implement GenAI agents using AWS Bedrock and related cloud-based AI capabilities
- Evaluate open-source GenAI frameworks against direct API integrations and select appropriate approaches for specific use cases
- Explore and implement multi-agent solutions using frameworks such as AutoGen where appropriate
- Investigate and resolve application, infrastructure, and integration issues
- Optimize system performance and reliability
- Collaborate with stakeholders and technical teams across multiple global regions
- Contribute to innovation within the broader engineering organization
Requirements:
- Senior-level experience
- Upper-Intermediate English proficiency
- Candidate must be located in Poland
- Availability to work in the CET time zone
- Experience with Python and FastAPI in production environments
- Practical experience with GenAI and agentic application development
- Hands-on knowledge of LangGraph and LangChain
- Experience with managed cloud-based GenAI services such as AWS Bedrock / AgentCore or comparable solutions
- Strong experience with PostgreSQL and relational database development
- Hands-on experience with Pandas and Excel-based data processing
- Frontend development experience with Next.js and React
- Experience using AI-assisted development tools such as Cursor, Claude Code, or Codex
- Experience designing and developing scalable APIs and backend services
- Ability to manage multiple tasks and priorities effectively in parallel
- Strong critical thinking skills
- Proactive approach to clarifying requirements
- Comfortable working in a proof-of-concept-oriented delivery environment
- Excellent communication skills
- Nice to have: Experience with MCP and FastMCP
- Nice to have: Experience with web scraping and external data ingestion
- Nice to have: Experience with Docker, cloud-native architectures, and serverless technologies
- Nice to have: Experience with Terraform and cloud infrastructure troubleshooting
Benefits:
- Full-time employment contract (UoP) at 0.125 FTE
- Client-provided equipment
- Fully remote work
- English check and interview process
- Payment terms up to 60 days
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