{"id":2846821,"url":"https://alion.io/job/oneadvanced-senior-software-engineer","title":"Senior Software Engineer","company":{"id":51451,"name":"OneAdvanced","domain":"oneadvanced.com","url":"https://alion.io/company/oneadvanced","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"iCIMS","truth_index":{"grade":"A","score":100,"open_postings":8,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":16,"computed_at":"2026-10-22T06:10:10Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Birmingham, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":72000,"max_usd":141000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":130},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"AI Agents","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"PostgreSQL","optional":false},{"name":"SQL","optional":false},{"name":"Windows","optional":false},{"name":"Confluence","optional":true},{"name":"Git","optional":true},{"name":"Jira","optional":true}],"status":"live","first_seen_at":"2026-10-19T11:25:58Z","employer_posted_date":"2026-10-19","last_verified_at":"2026-10-22T09:28:26Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Join OneAdvanced\nWhat if you could combine challenging software engineering with the opportunity to make a genuine difference to healthcare?\nAt OneAdvanced, we're evolving Vision, a large-scale clinical practice management system used by GP surgeries and healthcare clinics. Thousands of clinical users rely on our software to support patient care, making reliability, quality and innovation essential.\nWe're looking for an experienced Senior Software Engineer to help shape the future of this mission-critical product. You'll work across a complex, established codebase, modernising technology, developing new capabilities and using agentic AI tools to transform how we build and test software.\nWorking with C++, COM and C#/.NET, you'll tackle substantial engineering challenges while helping move Vision towards a more modern, maintainable architecture. It's an opportunity to combine strong engineering fundamentals with emerging AI-enabled development practices and see the real-world impact of your work.\nWhat You Will Do\nDevelop, maintain and enhance Vision across a complex codebase spanning C++, COM and C#/.NET.\nDiagnose challenging issues and improve system reliability, performance, maintainability and test coverage.\nSupport the modernisation of legacy C++ and VB6 functionality towards modern .NET solutions.\nWork with SQL databases, COM interop and established data access technologies.\nContribute to new web-based workflows through our IQHealth platform, improving experiences for GP practices and clinical users.\nUse agentic AI development and testing tools to accelerate engineering workflows, explore solutions and improve software quality.\nReview and validate AI-generated code, applying sound engineering judgement to ensure changes are secure, reliable and appropriate for a clinical environment.\nDevelop and maintain integrations with NHS systems and relevant healthcare standards.\nContribute to technical design, code reviews and automated testing, collaborating with Product and QA teams to deliver effective solutions.\nWhat You Will Have\nMust Have:\nCommercial experience developing complex software using MS C++ and C#/.NET.\nExperience with Windows desktop applications, ideally Windows Forms, and a strong understanding of maintaining and evolving established systems.\nExperience working with large codebases, diagnosing complex issues and understanding dependencies across application components.\nSolid SQL and relational database development skills; PostgreSQL experience is preferred.\nExperience using Visual Studio and MSBuild in a commercial development environment.\nAn understanding of COM, OLE and interoperability concepts.\nAn understanding of Windows APIs.\nA commitment to clean, maintainable code, appropriate testing and high engineering standards.\nHighly Desirable:\nExperience with COM-based systems, VB6 or VB.NET and legacy modernisation.\nPractical experience with agentic AI development tools, AI coding assistants or AI-enabled testing.\nCuriosity about AI-assisted software engineering and the ability to critically assess AI-generated code.\nExperience in healthcare, regulated or safety-critical software environments.\nKnowledge of NHS integrations, clinical systems or SNOMED CT.\nExperience with unit testing frameworks and Ranorex or comparable testing frameworks.\nExperience navigating large solutions with many interconnected projects.\nFamiliarity with Git or Perforce, Jira and Confluence.\nSuccess Measures\nDeliver high-quality software that meets requirements and minimises post-release defects.\nImprove system reliability, maintainability and automated test coverage.\nContribute to modernisation initiatives that support Vision's long-term evolution.\nUse AI-enabled development and testing to improve productivity without compromising quality or safety.\nMeet applicable NHS assurance and information governance requirements, maintaining a strong focus on clinical safety and data integrity.\nCommunicate technical decisions clearly and collaborate effectively across engineering, product and QA.\nContribute to thoughtful technical design, code reviews and continuous improvement.\nKey Relationships\nEngineering teams and technical leadership.\nProduct Managers and Product Owners.\nQA and software testing teams.\nExternal stakeholders, including NHS authorities and health boards.\nCapabilities & Behaviours\nEnjoys solving complex engineering problems and improving established systems.\nTakes pride in writing reliable, maintainable software and making sound technical decisions.\nUnderstands the responsibility involved in developing software that supports clinical care.\nEmbraces modern engineering practices and is curious about how agentic AI can improve software development.\nApplies critical thinking when evaluating AI-generated code and changing complex systems.\nCollaborates openly, shares knowledge and constructively challenges ideas to achieve better outcomes.\nBalances pragmatic delivery with long-term technical quality and continuous improvement.\nWhat We Do For You\nWellbeing that means something\n26 days’ holiday + bank holidays (and the option to buy more) plus 1 paid volunteering day every year\nExceptional family leave, 26 weeks fully paid maternity/adoption, 4 weeks fully paid paternity, 22 weeks fully paid shared parental leave, plus 5 days paid bereavement leave\nRobust sick pay of up to 13 weeks full pay + 13 weeks half pay\n24/7 Employee Assistance Programme for confidential support\nPrivate medical insurance for everyone, no medical-history exclusions\nFinancial benefits that have your back\nPerformance-based rewards tailored to your role, from company-wide bonuses to OTE and commission structures\nIncome protection: up to 75% salary for 5 years if you ever need it\nPension with 5% matched company contributions\nLife assurance worth 4x your salary from day one\nFree financial planning session with the option to engage in more tailored financial coaching.\nGrow your career with us\nSkillsHub learning platform with leadership pathways, future-manager training, and a huge online library\nAccess to external training and apprenticeships\nMaking a Difference\nMatchIt! Fundraise for a cause close to your heart and OneAdvanced will match part of the funding\nPennies from Heaven donate the pennies from your pay check to help make a difference without lifting a finger\nPlus plenty other flexible benefits to suit your lifestyle on our RewardHub, including:\nULEV car scheme with 1,000+ models\nDental insurance, Health Cash Plan, Critical Illness Cover, Partner Life Cover, Health Assessment, Gym Membership\nWho We Are\nAt OneAdvanced, we are at the forefront of delivering sector-focused technology solutions that simplify complexity, drive meaningful progress, and help build a fairer, more inclusive society.\nWe’re much more than a software company. We deliver SaaS workflow applications and IT services that power organisations across Education, Government, Healthcare, Legal, Manufacturing, Housing, Retail, and more.\nOneAdvanced is one of the UK’s largest business software and services companies. Based in Birmingham (The Mailbox), operating across the UK, Ireland, India, and Australia.\nOur secure, scalable platform, including OneAdvanced AI, our private AI service for UK organisations, powers connectivity and innovation across critical sectors. Alongside our software are our IT services, including hosting, managed services, and application modernisation.\nWe strive to create an inclusive workplace that drives innovation and collaboration, championing diverse perspectives and ideas. Our Environmental, Social and Governance (ESG) strategy is embedded in everything we do, guiding us to create meaningful impact for our people, our customers and the planet.\nProud to be recognised in the Financial Times’ Best Employers 2026 list for the second-year running, an independent and data led ranking based on employee feedback. Join us and become part of a team that’s powering the world of work and making a real difference.\nJoin us and become part of a team that’s powering the world of work and making a real difference.\nLearn more at www.oneadvanced.com","description_format":"text","description_chars":8130,"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","Gym membership","Health insurance","Parental leave"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["ERP & Business Management Software","EHR & Clinical Software","HR & Payroll Software","Legal Software"],"lifecycle":[{"event":"open","at":"2026-10-19T11:25:58Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":2,"expected_fill_days":16,"reasons":["conf:0","velocity","win:early"],"computed_at":"2026-10-22T06:10:10Z"},"pay":null,"html_url":"https://alion.io/job/oneadvanced-senior-software-engineer","json_url":"https://alion.io/job/oneadvanced-senior-software-engineer.json","meta":{"generated_at":"2026-10-22T11:17:30Z","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":9114,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-23T00:00:00Z"}},"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":51451},"rest":"https://alion.io/mcp/rest/get_company?id=51451"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Foneadvanced-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%2Foneadvanced-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%2Foneadvanced-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/oneadvanced-senior-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Foneadvanced-senior-software-engineer"}]}