{"id":3825691,"url":"https://alion.io/job/avenga-senior-backend-engineer-fix-identity","title":"Senior Backend Engineer (FIX & Identity)","company":{"id":181252,"name":"Avenga","domain":"avenga.com","url":"https://alion.io/company/avenga","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":{"grade":"B","score":77,"open_postings":25,"ghost_share":0,"stale_share":0.92,"repost_share":0,"time_to_fill_p50_days":31,"computed_at":"2026-11-06T05:58:05Z"}},"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":["Banja Luka, Bosnia and Herzegovina","Belgrade, Serbia","Bitola, North Macedonia","Kragujevac, Serbia","Niš, Serbia","Novi Sad, Serbia","Ohrid, North Macedonia","Skopje, North Macedonia","Istanbul, Turkey","İzmir, Turkey"],"countries":["BA","RS","MK","TR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"C#","optional":false},{"name":"Datadog","optional":false},{"name":"ElasticSearch","optional":false},{"name":"IdentityServer","optional":false},{"name":"Java","optional":false},{"name":"Sentry","optional":false},{"name":"Databricks","optional":true},{"name":"JavaScript","optional":true},{"name":"React.js","optional":true},{"name":"Redux","optional":true},{"name":"WebSockets","optional":true}],"status":"live","first_seen_at":"2026-11-05T13:16:34Z","employer_posted_date":"2026-11-05","last_verified_at":"2026-11-06T15:22:19Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"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. \nCore skills you’ll bring\n5+ years building backend systems, ideally in C#/.NET. Strong Java engineers are welcome too, and we will give you time to move to .NET\n\nReal experience with the FIX protocol on electronic trading platforms in fintech or capital markets\n\nHands-on work with login and access control (OAuth2, OpenID Connect, IdentityServer or similar)\n\nDesigning and building APIs that other teams rely on\n\nSolid experience with message-based, event-driven systems\n\nExperience with financial calculations, such as pricing, where small rounding errors matter\n\nComfort with MongoDB or another NoSQL database\n\nSome experience with monitoring tools such as Datadog, Sentry or Elasticsearch\n\nClear communication and a habit of working well with product, frontend and DevOps colleagues\n\nNice-to-have\nKnowledge of fixed income or securities pricing\n\nExperience with QuantLib or other quantitative finance libraries\n\nLive data streaming with SignalR or WebSockets\n\nExposure to Pulsar, Databricks or Lakehouse setups\n\nSome React and Redux for light frontend work\n\nThe impact you'll create\nBuild the services behind a trading platform, where speed and accuracy matter every day\n\nConnect the platform to banks, brokers and venues through FIX\n\nMake sure the right people have the right access across all our services\n\nShape how pricing and financial calculations are done, with exact results\n\nHelp keep the system reliable and easy to monitor as it grows\n\nShare your experience with other engineers and help set good engineering standards\n\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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