{"id":4089396,"url":"https://alion.io/job/shieldpay-senior-net-engineer","title":"Senior .NET Engineer","company":{"id":51412,"name":"Shieldpay","domain":"shieldpay.com","url":"https://alion.io/company/shieldpay","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","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":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ASP.NET Core","optional":false},{"name":"C#","optional":false},{"name":"Dependency Injection","optional":false},{"name":"Entity Framework Core","optional":false},{"name":"JavaScript","optional":false},{"name":"JQuery","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-07-28T14:47:47Z","employer_posted_date":"2026-07-28","last_verified_at":"2026-11-11T19:48:47Z","board_verified":true,"closed_at":null,"days_open":106,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":106},"description":"Impact and Responsibilities\nWe're a small engineering team behind a regulated payments platform that holds, verifies and disburses client money. We're looking for a Senior .NET Engineer to help shape where it goes next: building what our customers need, making our core safe to change, and bringing it onto modern .NET step by step rather than rewriting it. You'll work across the whole platform, with a real say in its direction.\nBuild for our customers\nDeliver features and improvements for the firms that use Shieldpay, from making the platform self-service end to end to enterprise needs such as single sign-on.\n\nBuild new services cleanly, with dependency injection, robust authentication and authorisation, structured logging and full observability.\n\nMake our core safe to change, and modernise it\nExtract business rules from undocumented SQL Server stored procedures and C# into clean, tested rules assemblies. They target netstandard2.0, so they run inside our .NET Framework platform today and on modern .NET tomorrow.\n\nWork across the links between our two platforms: an API façade, a database proxy and SNS/SQS events. Neither platform stands alone, and most real bugs live in the coupling, not on one side.\n\nShip changes in shadow mode: compute, log and compare against the legacy outcome without writing, until equivalence is demonstrated.\n\nShape how we build\nHelp set the platform's technical direction. Our target shape is a starting point to be tested, and the team changes it where the evidence says it's wrong.\n\nBuild with AI properly: the test harness in place first, and the gains measured, not assumed.\n\nTake the lead on an area of the platform: own it end to end, set its technical direction and lead the work day to day.\n\nWhat we're looking for in you\nYou're senior and hands-on in modern .NET, as well as deeply comfortable in legacy .NET Framework 4.x (ASP.NET MVC 5, Web API 2, Entity Framework 6). You respect legacy code and are happy working in it today.\n\nYou read, understand and safely change complex SQL Server logic.\n\nYou're comfortable working in JavaScript/TypeScript: jQuery on the legacy front end, and TypeScript services on our sister platform.\n\nYou have a \"boring technology\" instinct. You favour stability, predictability and incremental progress over rewriting everything or chasing trends.\n\nYou've proved equivalence before, using golden-master testing, diffing or shadow verification to show that new code matches legacy outputs.\n\nYou can hold two architectures in your head at once, and reason through their edge cases, data flows and coupling points.\n\nHow you work\nYou ask before you design. When a problem is underspecified, you draw out who it's for, how many, what can fail and what's regulated before proposing anything.\n\nYou're correct by default. You raise idempotency, partial failure, audit trails and reconciliation without being prompted.\n\nYou choose the simplest thing that works, and steer others away from over-engineering.\n\nYou push back with reasons, and change course when you're shown something new.\n\nYou turn large, ambiguous problems into work the team can pick up, and keep it moving.\n\nYou make the people around you better through reviews, pairing and mentoring, and you hold AI-generated work, yours and theirs, to the same standard as anything else.\n\nOur Promise: Shieldpay is an equal opportunities employer. For Shieldpay building a fair and transparent workforce begins with the recruitment process that does not discriminate on the grounds of gender, sexual orientation, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability or age. We offer flexible working options, such as flexible hours and hybrid work, to support our employees' work-life balance","description_format":"text","description_chars":3800,"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":["Flexible schedule","Hybrid work"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Financial Software & Embedded Finance","Payment Processing & Gateways"],"lifecycle":[{"event":"open","at":"2026-11-11T19:48:47Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-11-11T07:38:50+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":11,"band":"cold","label":"Long shot","p_open":1,"p_active":0.407,"p_room":0.28,"age_days":106,"expected_fill_days":29,"reasons":["conf:2","win:tail","crowd:"],"computed_at":"2026-11-11T22:01:16Z"},"pay":null,"html_url":"https://alion.io/job/shieldpay-senior-net-engineer","json_url":"https://alion.io/job/shieldpay-senior-net-engineer.json","meta":{"generated_at":"2026-11-11T22:01:16Z","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":43476,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-12T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":51412},"rest":"https://alion.io/mcp/rest/get_company?id=51412"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fshieldpay-senior-net-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"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%2Fshieldpay-senior-net-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Fshieldpay-senior-net-engineer"},{"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/shieldpay-senior-net-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fshieldpay-senior-net-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":4089396}},{"tool":"search_jobs","arguments":{"company":"shieldpay.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":4089396},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. Docs: https://alion.io/developers"}}