Senior Software Engineer (Python)

Company

A startup-like full-stack engineering team inside one of Bulgaria’s leading banks, building production software systems, AI-powered applications, and backend platforms used by real customers.

What you will do

• Design, develop, and maintain high-performance backend services and APIs with Python and FastAPI.
• Own software components end to end, from requirements and architecture through implementation, testing, deployment, monitoring, and improvement.
• Build scalable APIs and distributed services for production workloads.
• Design database schemas, queries, indexes, and data-access layers across SQL and NoSQL systems.
• Contribute to architecture decisions involving service boundaries, caching, asynchronous processing, and reliability.
• Review code, provide technical guidance, and improve engineering standards across the team.

Requirements

• 5+ years of software engineering experience with strong Python backend development experience.
• Advanced Python knowledge, including object-oriented and functional programming, asynchronous programming, concurrency, typing, error handling, and ecosystem best practices.
• Strong experience with FastAPI or similar modern Python web frameworks, REST APIs, HTTP, authentication, authorization, validation, serialization, versioning, and error handling.
• Strong SQL and relational database knowledge, especially PostgreSQL, plus practical understanding of NoSQL databases such as Redis, MongoDB, Elasticsearch, or OpenSearch.
• Knowledge of data structures, algorithms, software design principles, modular architecture, testing, Git, CI/CD, Docker, Linux, and cloud environments.
• Upper-Intermediate English or above is required.

Nice to have

• Experience with distributed systems, microservices, Kubernetes, Helm, and Azure.
• Experience with Kafka, Redis, SQLAlchemy, and asynchronous or event-driven architectures.
• Knowledge of observability, monitoring, performance optimization, concurrency, and high-throughput systems.
• Frontend experience with React and TypeScript or willingness to contribute to frontend development.
• Experience integrating AI/ML or LLM-powered applications into production systems.

Culture & Benefits

• Production work with direct customer impact across banking software, AI, ML, and backend platforms.
• Modern technology stack comparable to leading global IT companies.
• In-house ML and AI platforms supporting deployment from development to production.
• EU Blue Card support.
• Salary from $3,000 net per month and an annual bonus of up to two salaries.