{"id":3338259,"url":"https://alion.io/job/avenga-senior-backend-engineer-net-and-python","title":"Senior Backend Engineer (.NET and Python)","company":{"id":181252,"name":"Avenga","domain":"avenga.com","url":"https://alion.io/company/avenga","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":{"grade":"B","score":76,"open_postings":26,"ghost_share":0,"stale_share":0.962,"repost_share":0,"time_to_fill_p50_days":32,"computed_at":"2026-11-02T06:13:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Sofia, Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":45000,"max_usd":85000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"C#","optional":false},{"name":"Claude Code","optional":false},{"name":"Copilot","optional":false},{"name":"Cursor","optional":false},{"name":"Function Calling","optional":false},{"name":"GCP","optional":false},{"name":"GitHub","optional":false},{"name":"Grafana","optional":false},{"name":"gRPC","optional":false},{"name":"Kubernetes","optional":false},{"name":"Least Privilege","optional":false},{"name":"LLM","optional":false},{"name":"OpenTelemetry","optional":false},{"name":"Prometheus","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"Terraform","optional":false},{"name":"CI/CD","optional":true},{"name":"Envoy","optional":true},{"name":"LiteLLM","optional":true},{"name":"Open Policy Agent","optional":true}],"status":"live","first_seen_at":"2026-10-27T12:15:18Z","employer_posted_date":"2026-10-27","last_verified_at":"2026-11-02T21:09:38Z","board_verified":true,"closed_at":null,"days_open":6,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":6},"description":"Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets. \nAt the core of the role\nWe’re looking for a hands-on engineer to help shape an enterprise platform from an early stage, building and maintaining the backend services, APIs, and cloud infrastructure that power AI-driven solutions.\nYou’ll focus on security, access control, policy enforcement, observability, and reliability at enterprise scale, while leveraging automation and modern DevOps practices to streamline delivery.\nYour work will have a visible impact from the first weeks, with opportunities to contribute to the platform itself and later support its deployment with enterprise clients.\nCore skills you’ll bring\n6+ years of professional backend engineering, with production experience in both C#/.NET and Python, and strong in at least one of them.\n\nAPI and distributed-systems design: REST and gRPC, asynchronous processing and queues, idempotency, relational and NoSQL data stores.\n\nProduction experience on at least one major cloud (Azure, AWS or GCP) and working experience with a second, including Terraform or equivalent, containers and Kubernetes.\n\nSecurity fundamentals: OAuth 2.0 and OpenID Connect, secrets, least privilege, network isolation, data protection.\n\nObservability experience: OpenTelemetry, Prometheus/Grafana or a cloud-native equivalent.\n\nSpec-driven development as your normal way of working: specifications, interface contracts and acceptance criteria written before code; daily use of AI coding agents (for example GitHub Copilot, Claude Code or Cursor, with tools such as GitHub Spec Kit or Kiro); rigorous review and testing of generated code.\n\nA working understanding of LLM applications: model APIs, streaming, tool calling. You do not need to be an AI specialist.\n\nFluent English: you can explain a design to a client's CTO or security team and defend it.\n\nNice-to-have\nAPI gateways and reverse proxies: Azure API Management, YARP, Envoy, LiteLLM or similar.\nPolicy engines such as Open Policy Agent, and audit-grade logging.\n\nHigh-throughput streaming APIs.\n\nRegulated industries (financial services, pharma, telco).\n\nConsulting or client-facing delivery; contributions to open-source projects.\n\nThe impact you'll create\nDesign and build backend services and APIs in C#/.NET and Python: an AI gateway, access control, rate and spend limits, failover and upgrades.\n\nIntegrate with enterprise identity, secrets management and the AI services clients already use on Azure, AWS and GCP.\n\nBuild for performance and resilience: streaming, concurrency, caching, load testing and graceful degradation.\n\nStore and serve audit, usage and cost data reliably.\n\nBuild cloud infrastructure as code and CI/CD pipelines, with supply-chain security.\n\nInstrument everything: traces, metrics and logs, with the alerts and runbooks that production needs.\n\nWork spec-first: write the specification and acceptance criteria, implement with AI coding agents, then review and verify what they produce.\n\nWrite and review production-grade code, and contribute to technical proposals.\n\n What supports your journey\nPeople are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. 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