{"id":2353037,"url":"https://alion.io/job/constructor-tech-senior-software-engineer-python-rust-3","title":"Senior Software Engineer (Python, Rust)","company":{"id":1984326,"name":"Constructor Tech","domain":"constructor.tech","url":"https://alion.io/company/constructor-tech","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"D","score":54,"open_postings":51,"ghost_share":0.765,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":48000,"max_usd":90000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"Asyncio","optional":false},{"name":"CI/CD","optional":false},{"name":"Clean Architecture","optional":false},{"name":"Dependency Injection","optional":false},{"name":"FastAPI","optional":false},{"name":"gRPC","optional":false},{"name":"Kubernetes","optional":false},{"name":"Mypy","optional":false},{"name":"NATS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"RabbitMQ","optional":false},{"name":"Rest API","optional":false},{"name":"Rust","optional":false},{"name":"Anthropic","optional":true},{"name":"LangChain","optional":true},{"name":"LangGraph","optional":true},{"name":"LLM","optional":true},{"name":"OpenAI","optional":true},{"name":"Qdrant","optional":true},{"name":"RAG","optional":true}],"status":"live","first_seen_at":"2026-05-07T06:07:57Z","employer_posted_date":"2026-08-18","last_verified_at":"2026-10-13T05:11:28Z","board_verified":true,"closed_at":null,"days_open":159,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":158},"description":"Our mission\nConstructor’s mission is to enable all educational organisations to provide high-quality digital education to 10x people with 10x efficiency. \nWith 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.\nPlease send your resume in English only.\nThe type of contract is a full-time legal agreement in Bulgaria, Serbia, and Turkey, not a B2B contract.\nDuties and Responsibilities:\nDesign and implement backend services in Rust within a microservices architecture.\nMaintain and evolve existing Python services (FastAPI) where it's the right tool for the job.\nWrite maintainable, testable, and performant code; participate in code reviews and raise the engineering bar across the team.\nWork with QA and DevOps to improve reliability, observability, and performance of our services.\nContribute to architectural decisions: choosing the right language for each problem, inter-service communication patterns, and data modeling.\nQualifications and Experience:\n5+ years of professional backend development experience.\n Solid production experience with Rust (minimum of 3 years).\n Strong Python: FastAPI or similar modern frameworks, asynchronous programming (asyncio), and type-driven development (mypy, pydantic).\nDeep understanding of microservices and communication patterns: sync/async, event-driven, message brokers (Kafka / RabbitMQ / NATS), gRPC/REST.\nWorking-level PostgreSQL: indexes, transactions, isolation levels, locking, query plans.\nSOLID, dependency injection, and clean architecture - applied in practice, not just in theory.\nWorking knowledge of k8s, containers, networking, and CI/CD.\nEnglish B2 or higher.\nNice to Have but not Obligatory: \nExperience migrating Python services to Rust under real load (with measurements and clear motivation).\nExposure to vector databases (e.g., Qdrant).\nExperience integrating with LLM APIs (OpenAI, Anthropic).\nFamiliarity with LangChain / LangGraph and RAG\nWhat We Offer\n Choice of work equipment (e.g., laptop, monitor, etc.)\n English classes (iTalki - $130 monthly)\n Flexible schedule (we usually work between 09:00/10:00 and 18:00/19:00)\n Newborn bonus (€500 per child)\n Patent remuneration\n Paid leave\n Remote work in locations without our offices\n Hybrid work in locations with offices (2 days in-office, 3 days remote)\nConstructor fosters equal opportunity for people of all backgrounds and identities. 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