{"id":1975136,"url":"https://alion.io/job/matchtech-microsoft-office-add-in-developer-netc","title":"Microsoft Office Add-In Developer (.NET/C#)","company":{"id":2073484,"name":"Matchtech","domain":"matchtech.com","url":"https://alion.io/company/matchtech-com","size_band":"11-50","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Schema","truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":"contractor","work_mode":"on_site","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":350,"max":350,"currency":"GBP","period":"day","gross":null,"usd_annual":116000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Azure","optional":false},{"name":"Azure DevOps","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Microsoft Office","optional":false},{"name":"Agile","optional":true},{"name":"PowerShell","optional":true},{"name":"SharePoint","optional":true}],"status":"live","first_seen_at":"2026-10-06T21:00:35Z","employer_posted_date":"2026-10-06","last_verified_at":"2026-10-11T19:48:41Z","board_verified":true,"closed_at":null,"days_open":5,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":5},"description":"Microsoft Office Add-In Developer (.NET/C#)\nOffice Add-ins | VSTO | Azure | Azure DevOps | Inside IR35 | ASAP Start | Contract until January 2027\nWe're partnering with a prestigious London-based law firm to secure an experienced Microsoft Office Add-In Developer to support the development, enhancement and maintenance of bespoke Office solutions used across the business.\nThis role is ideal for a developer with strong experience in .NET, C#, VSTO and custom Microsoft Office add-ins, alongside exposure to Azure-hosted solutions and Azure DevOps (ADO) pipelines.\nWhile primarily remote, candidates should be willing and able to travel to London on occasion for stakeholder meetings, workshops and project activities.\nKey Responsibilities\nDesign, develop and maintain bespoke Microsoft Office add-ins and integrations.\nBuild and support solutions using .NET, C# and VSTO technologies.\nGather requirements and work closely with business stakeholders to deliver tailored solutions.\nEnhance and support existing Office-based applications and automation tools.\nDevelop and maintain integrations with backend systems and services.\nSupport Azure-hosted applications and services associated with Office solutions.\nCreate and maintain CI/CD pipelines within Azure DevOps (ADO).\nTroubleshoot and resolve application issues, performance concerns and user-reported defects.\nContribute to development standards, code quality and best practices.\nEssential Skills & Experience\nStrong commercial experience with .NET and C# development.\nProven experience developing and supporting Microsoft Office Add-ins.\nExpertise in VSTO (Visual Studio Tools for Office).\nExperience developing bespoke Office solutions for enterprise environments.\nExperience with Azure-hosted applications and services.\nStrong knowledge of Azure DevOps (ADO), including build and release pipelines.\nExperience with application troubleshooting, debugging and performance optimisation.\nExcellent stakeholder engagement and communication skills.\nDesirable Skills\nExperience within legal, professional services or highly regulated environments.\nKnowledge of Microsoft 365 and Office Add-in technologies.\nExperience with PowerShell and automation.\nFamiliarity with SharePoint, Microsoft Graph or other Microsoft ecosystem technologies.\nExperience working in Agile delivery teams.\nContract Details\nRole: Microsoft Office Add-In Developer\nClient: Leading London Law Firm\nLocation: Remote with occasional travel to London\nIR35 Status: Inside IR35\nStart Date: ASAP\nDuration: Until 31st January 2027\nRate: Competitive day rate\nIf you're an experienced .NET/C# Developer with strong expertise in VSTO, bespoke Office add-ins, Azure and Azure DevOps, we'd love to hear from you. 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