Senior Python Software Engineer

With 42 years of experience in the international market and 19 years in Romania, HN Services means:

Digital transformation and IT professionals;

Diversity of technical roles;

Wide IT market exposure in different domains of activity;

A dedicated internal training center for software development

💡 We, at HN Services Romania, are expanding our team in Bucharest, and we are looking for new, experienced professionals ready to deliver high-quality solutions. The goal is to ensure that the Software Development services provided to the business are stable, resilient and performant.

Responsibilities:

• Develop a tailored wrapper for the OpenAI API using Python and FastAPI;
• Integrate Generative AI tools such as embeddings, vector operations, and pre-built APIs;
• Implement JWT-based authentication for secure API interactions;
• Design and manage RESTful endpoints for interacting with the OpenAI services;
• Work with databases (e.g. PostgreSQL) for storing conversational history or embeddings;
• Optimize API performance, ensuring stateless design where required;
• Collaborate with frontend teams to deliver end-to-end features;
• Integrate with Vector Databases (VectorDB e.g. ChromaDB, pgVector, Pinecone) for embedding-based retrieval workflows;
• Implement cleanup and background tasks via scheduled jobs (e.g., CronJobs);
• Write clean, well-documented, and maintainable code;
• Collaborate with other teams for cross-service integration.

Must Have:

• 3+ years Proficiency in Python (OOP, asynchronous programming, performance optimization, design patterns) and hands-on experience with FastAPI (endpoints, routers, middlewares, handling schemas and performing data validation with Pydantic);
• Solid understanding of RESTful API principles and authentication protocols (JWT/OAuth2);
• Experience integrating with OpenAI API (e.g., ChatGPT, embeddings);
• Knowledge of Database and Data Management (SQL, NoSQL, Vector DBs, and ORM);
• Testing and Debugging knowledge (writing unit tests with unittest or pytest);
• Programming best practices (SOLID, PEP8 and analysis with flake8), and security assurance (writing secure code e.g. validating inputs, avoiding injection attacks) managing secrets securely with tools like HashiCorp Vault);
• Familiarity with CI/CD workflows (Jenkins/Tekton), version control systems (Git), and Atlassian Suite (Jira/Confluence/Bitbucket);
• Understanding of containerization and orchestration tools like Docker, and K8s;
• Strong problem-solving skills, ability to work independently as well as part of a team;
• Excellent communication and collaboration skills;
• Attention to detail and ability to meet project deadlines.

Nice to Have:

• Prior experience with Generative AI tools and libraries (e.g., Gensim, OpenAI Embeddings);
• Knowledge of Vector Databases (VectorDB e.g. ChromaDB, pgVector, Pinecone) for GenAI data retrieval workflows;
• DevOps knowledge with OpenShift, Helm Charts, and ArgoCD;
• Experience with task automation tools (e.g., CronJobs);

Only eligible candidates will be contacted for further information and start of the recruitment process.