{"id":52590,"url":"https://alion.io/job/capital-on-tap-senior-software-engineer","title":"Senior Software Engineer","company":{"id":12307,"name":"Capital on Tap","domain":"capitalontap.com","url":"https://alion.io/company/capital-on-tap","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":90,"open_postings":32,"ghost_share":0,"stale_share":0.375,"repost_share":0.031,"time_to_fill_p50_days":47,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"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":{"min_usd":85000,"max_usd":166000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":112},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"C#","optional":false},{"name":"React.js","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false},{"name":"Azure","optional":true},{"name":"Dart","optional":true},{"name":"Flutter","optional":true},{"name":"GCP","optional":true},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-05-19T09:59:12Z","employer_posted_date":"2026-09-15","last_verified_at":"2026-10-13T01:30:51Z","board_verified":true,"closed_at":null,"days_open":146,"trust":{"level":"stale","repost_count":1,"flags":["stale"],"days_open":145},"description":"We’re Capital on Tap\n Capital on Tap started because small businesses were underserved. Big banks were slow, their products weren't fit for purpose, and small business owners often couldn't access what they needed. We set out to fix that.\nToday we're a financial platform - not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier. \n1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we're profitable. We’ve done a pretty good job so far, but we’re just getting started! \nThis is a hybrid role, our engineering teams work from our London (Moorgate) Office 2 days per week.\nThe Role\nWe're looking for Senior Software Engineers to help us build the products that small businesses across the UK and US rely on every day. You'll work across cross-functional teams alongside Product Managers, QA Engineers, and fellow Software Engineers, owning problems end to end, from the first line of code through to production, monitoring, and continuous improvement.\nThis isn't a role for someone who wants to be handed a ticket and told what to build. We're looking for engineers who understand the problem, challenge the approach when it needs it, and take pride in the quality of what they ship. We only build what the customer wants.\nWhat You’ll Be Doing\nDesigning and building robust, scalable solutions in .Net/C#, taking full ownership of the SDLC from concept through to production\nPlaying an active role in architectural decisions and technical direction, shaping how things are built, not just building them\nWorking closely with Product and QA, bringing your technical perspective early and often\nWriting bulletproof unit and integration tests and holding a high bar for code quality across the team\nCommunicating clearly across technical and non-technical stakeholders, translating complex engineering decisions into business context\nMentoring and supporting engineers around you, raising the standard of the team as well as your own output\nWe’re Looking For\n Required skills:\n5+ years of hands-on experience in C#, .Net and SQL Server; React and Typescript are a strong plus\nA clear sense of what senior means. Not just years in the seat, but ownership, judgement, and the ability to operate with ambiguity\nStrong testing practices across unit and integration testing\nBroad engineering knowledge that goes beyond your core stack; the kind of depth and curiosity that comes from solving hard problems in complex, distributed systems\nThe ability to communicate clearly and confidently, with your team, with Product, and with the wider business\nExperience working in agile, cross-functional teams\nSomeone who's proactive, direct, and makes the people around them better\nOur Tech Stack\nBackend: C#, .Net, .Net Core\nFrontend: React, Typescript\nMobile: Flutter, Dart\nDatabases: SQL Server, MongoDB\nCloud: Azure & GCP\nInterview Process\nFirst stage: 30-minute intro, CV review, and values with a Talent Partner\nSecond stage: 45-minute “Tech Chat” with a Team Manager\nFinal stage: 90-minute Code Pairing + 30-minute Values Interview\nDiversity & Inclusion\n We welcome, consider and encourage applications from anyone who shares our commitment to inclusivity. Join us in creating a space where authenticity thrives, and everyone can do their best work.\nGreat Work Deserves Great Perks\nWe try not to take ourselves too seriously (all the time) so we make sure our office is decked out with a pool table, arcade machine, beer tap, and a couple of office dogs thrown in for good measure. Check out our benefits:\nPrivate Healthcare including dental and opticians services through Vitality\nWorldwide travel insurance through Vitality\nAnniversary Rewards (£250, £500, £750, 4-week fully paid sabbatical)\nSalary Sacrifice Pension Scheme up to 7% match\nOctopus EV Salary Sacrifice Scheme\n28 days holiday (plus bank holidays)\nAnnual Learning and Wellbeing Budget\nEnhanced Parental Leave\nCycle to Work Scheme\nSeason Ticket Loan\n6 free therapy sessions per year\nDog Friendly Offices\nFree drinks and snacks in our offices\nOther Info\n Check out our ‘Top Tips’ for interviewing.\nKeep updated on new job opportunities by following us on Linkedin.\nEmail  if you have any questions.\nExcited to work here? Apply!\n If you’d like to progress your career within our fast growing, profitable fintech then click apply and we will aim to get back to you within 3 working days (during busy periods this could take up to 5 working days.)","description_format":"text","description_chars":4713,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Parental leave","Pet friendly"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Cards & Card Issuing","Business & SME Lending","Procurement & Spend Management"],"lifecycle":[{"event":"open","at":"2026-05-19T09:59:12Z"},{"event":"close","at":"2026-09-07T18:12:39Z"},{"event":"reopen","at":"2026-09-15T09:43:42Z"}],"visa":[],"liveness":{"score":16,"band":"cold","label":"Long shot","p_open":1,"p_active":0.581,"p_room":0.28,"age_days":145,"expected_fill_days":47,"reasons":["conf:1","wave","velocity","win:tail","crowd:"],"computed_at":"2026-10-12T06:55:09Z"},"pay":null,"html_url":"https://alion.io/job/capital-on-tap-senior-software-engineer","json_url":"https://alion.io/job/capital-on-tap-senior-software-engineer.json","meta":{"generated_at":"2026-10-13T03:42:04Z","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":5893,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"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":12307},"rest":"https://alion.io/mcp/rest/get_company?id=12307"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcapital-on-tap-senior-software-engineer"},{"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%2Fcapital-on-tap-senior-software-engineer"},{"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%2Fcapital-on-tap-senior-software-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/capital-on-tap-senior-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcapital-on-tap-senior-software-engineer"}]}