{"id":12830,"url":"https://alion.io/job/trainline-senior-backend-engineer-net","title":"Senior Backend Engineer - .Net","company":{"id":4051,"name":"Trainline","domain":"thetrainline.com","url":"https://alion.io/company/trainline","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"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":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":85000,"max":95000,"currency":"GBP","period":"year","gross":null,"usd_annual":125558},"salary_estimate":null,"experience_years_min":null,"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":"CI/CD","optional":false},{"name":"GCP","optional":false},{"name":"GitHub Actions","optional":false},{"name":"IdentityServer","optional":false},{"name":"New Relic","optional":false},{"name":"TeamCity","optional":false},{"name":"Terraform","optional":false},{"name":"Docker","optional":true},{"name":"DynamoDB","optional":true},{"name":"PostgreSQL","optional":true}],"status":"live","first_seen_at":"2026-06-30T12:26:05Z","employer_posted_date":"2026-06-30","last_verified_at":"2026-10-17T16:03:31Z","board_verified":true,"closed_at":null,"days_open":109,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":109},"description":"About us\nAt Trainline, our purpose is to empower greener travel choices, connecting people and places. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels.\nGreat journeys start with Trainline\nWe’re Europe’s leading independent rail platform, helping millions of travellers find and book the best-value rail and coach journeys across our app, website and partner channels.\nOur job is to make the green travel choice the best choice. By building a better train travel experience, we help more people choose rail - creating a positive impact for customers, our business and the planet.\nWe’re a team of more than 1,000 Trainliners from over 50 nationalities, working across London, Paris, Barcelona, Milan, Edinburgh and Madrid. Now is a brilliant time to join us and help shape the future of travel.\nIntroducing the Backend teams at Trainline\nThe Backend teams at Trainline build the core of Trainline’s world class product. We create the journey search functionality that millions of our customers use on a daily basis, the eCommerce platform that provides a secure and seamless experience and we connect Trainline to over 270 travel operating companies, across 45 countries in Europe and the rest of the world. Each team has a targeted domain focus, ranging between journey search, fares calculation, bookings, fulfilment, payments, refunds, carriers’ integrations, real-time timetable information, journey disruptions and much more.\nAs a senior level .NET Engineer at Trainline you will...\nDeliver new functionality or features, using the most appropriate tools & techniques\n\nEnsure quality is at the heart of everything you and your team do\n\nContinuously improve the code base\n\nKeep our customer as the number one priority\n\nActively identify blockers, boulders, time sinks and waste, and actively attempt to remove them\n\nMake significant contribution to technical decisions\n\nAct as a coach and mentor to others in the team\n\nTake full ownership of the development lifecycle from code to production, including deployment and monitoring\n\nOur Tech Stack\nLanguages & Frameworks: C# (.NET 6-10)\n\nDatabases: DynamoDB, PostgreSQL\n\nCloud & Infrastructure: AWS Cloud, Docker, Terraform\n\nCI/CD & DevOps: GitHub Actions\n\nMonitoring & Logging: New Relic, ELK Stack\n\nWe'd love to hear from you if you have...\nExperience mentoring less experienced engineers and comfortable pair-programming with colleagues\n\nHands on experience with C# .NET and the latest features\n\nExperience collaborating with front-end engineers and other disciplines to deliver end-to-end features and cross-functional epics\n\nExperience working with identity and authentication systems (e.g. IdentityServer, OpenID Connect, OAuth2)\n\nExperience designing and maintaining CI/CD pipelines (e.g. GitHub Actions, TeamCity, Spacelift or similar tools)\n\nExperience with cloud platforms (AWS preferred; Azure or GCP also valuable)\n\nHands-on experience with Infrastructure as Code, particularly Terraform\n\nStrong experience with observability practices (logging, monitoring, alerting)\n\nFamiliarity with tools such as New Relic and ELK stack (or equivalents)\n\nCuriosity about AI and emerging tools\n\nExperience supporting production systems and improving reliability\n\nStrong experience building and operating microservices architectures\n\nExperience with event-driven systems and asynchronous messaging patterns\n\nSolid understanding of distributed systems and scalability challenges\n\nHave excellent communication skills\n\nMore information:\nEnjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits.\nWe prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Jump on board and supercharge your career from day one!\nWe're operating a hybrid model and ask that Trainliners work from the office a minimum of 60% of their time over a 12-week period. We also have a 28-day Work from Abroad policy.\nOur values represent the things that matter most to us and what we live and breathe everyday, in everything we do:\nThink Big - We're building the future of rail\n\nOwn It - We focus on every customer, partner and journey\n\nTravel Together - We're one team\n\nDo Good - We make a positive impact\n\nWe know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity - gender, ethnicity, sexuality, disability, nationality and diversity of thought. That's why we're committed to creating inclusive places to work, where everyone belongs and differences are valued and celebrated.\nInterested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!","description_format":"text","description_chars":4981,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Dental insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Ticketing","Travel Technology"],"lifecycle":[{"event":"open","at":"2026-06-30T12:26:05Z"}],"visa":[],"liveness":{"score":18,"band":"cold","label":"Long shot","p_open":1,"p_active":0.652,"p_room":0.28,"age_days":108,"expected_fill_days":40,"reasons":["conf:2","velocity","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":{"stated_usd_annual":125558,"is_top_pay":false},"html_url":"https://alion.io/job/trainline-senior-backend-engineer-net","json_url":"https://alion.io/job/trainline-senior-backend-engineer-net.json","meta":{"generated_at":"2026-10-17T16:44:06Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":23047,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4051},"rest":"https://alion.io/mcp/rest/get_company?id=4051"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftrainline-senior-backend-engineer-net"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Ftrainline-senior-backend-engineer-net"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Ftrainline-senior-backend-engineer-net"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/trainline-senior-backend-engineer-net\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftrainline-senior-backend-engineer-net"}]}