Senior Software Engineer (Python + Rust)

Constructor’s mission is to enable all educational organisations to provide high-quality digital education to 10x people with 10x efficiency. With strong expertise in machine intelligence and data science, Constructor’s all-in-one platform for education and research addresses today’s pressing educational challenges: access inequality, tech clutter, and low engagement of students. Please send your resume in English only. The type of contract is a full-time legal agreement in Bulgaria, Serbia, and Turkey, not a B2B contract.

Responsibilities

Design and implement backend services in Rust within a microservices architecture; Maintain and evolve existing Python services (FastAPI) where it's the right tool for the job; Write maintainable, testable, and performant code; participate in code reviews and raise the engineering bar across the team; Work with QA and DevOps to improve reliability, observability, and performance of our services; Contribute to architectural decisions: choosing the right language for each problem, inter-service communication patterns, and data modeling

Requirements

5+ years of professional backend development experience; Solid production experience with Rust (minimum of 3 years); Strong Python: FastAPI or similar modern frameworks, asynchronous programming (asyncio), and type-driven development (mypy, pydantic); Deep understanding of microservices and communication patterns: sync/async, event-driven, message brokers (Kafka / RabbitMQ / NATS), gRPC/REST; Working-level PostgreSQL: indexes, transactions, isolation levels, locking, query plans; SOLID, dependency injection, and clean architecture — applied in practice, not just in theory; Working knowledge of k8s, containers, networking, and CI/CD; English B2 or higher

Nice to have

Experience migrating Python services to Rust under real load (with measurements and clear motivation); Exposure to vector databases (e.g., Qdrant); Experience integrating with LLM APIs (OpenAI, Anthropic); Familiarity with LangChain / LangGraph and RAG

Benefits

Choice of work equipment (e.g., laptop, monitor, etc.); English classes (iTalki – $130 monthly); Flexible schedule (we usually work between 09:00/10:00 and 18:00/19:00); Newborn bonus (€500 per child); Patent remuneration; Paid leave; Remote work in locations without our offices; Hybrid work in locations with offices (2 days in-office, 3 days remote)