Backend Developer

Backend Developer - PlenoCollaborate with data scientists and ML engineers to understand requirements for ML/LLM features. Design, implement, maintain, improve, and document backend systems (Python, FastAPI) for ML/LLM features. Manage and optimize databases (Postgres, MongoDB, Milvus) for application storage. Improve observability and reliability for distributed, async workloads (structured logging, metrics, retry/backoff strategies, traces). Help maintain and orchestrate containerized development workflows (uv, Docker, Docker Compose, Kubernetes) and CI checks. Raise the bar for testing (unit + integration) to ensure high code quality and reliability. Improve the local development experience for the team by establishing and promoting Python-based development standards and best practices. Integrate and optimize calls to LLM APIs (OpenAI) and agentic frameworks (OpenAI Agents SDK). Mentor other engineers and drive architectural decisions.RequirementsExperience in backend engineering, specifically in building production services, with over 2 years of expertise in working with asynchronous Python. Extensive Python knowledge: async/await, typing system, modern Pydantic (v2), and testing frameworks (pytest). Production experience building RESTful APIs with FastAPI and ASGI servers (uvicorn). Solid operational and debugging skills for async systems and distributed services. Strong familiarity with Postgres and MongoDB databases. Experience with vector search systems (Milvus, FAISS, Pinecone) and embedding pipelines. Experience with message queues, background processing, and patterns for batch processing, idempotency, and retries. Practical experience integrating with OpenAI or other LLM providers. Comfortable working with containerization technologies (Docker, Docker Compose, Kubernetes). Familiarity with AWS services (EKS, ECS, S3). Familiarity with CI/CD pipelines (Jenkins, GitHub Actions). Good communication skills and ability to work effectively in a remote team environment. Good English proficiency (reading, writing, speaking).OSF Digital is proud to be an equal opportunity employer, where you can bring your whole self to work. Join an inclusive and passionate community of professionals who help bring about digital transformation for businesses around the world. At OSF Digital, we welcome all individuals and do not discriminate on the basis of gender identity and expression, race, ethnicity, disability, sexual orientation, color, religion, national origin, age, marital status, or any other protected category in any of the jurisdictions in which we conduct business.