{"id":2073689,"url":"https://alion.io/job/inetum-senior-net-developer-2","title":"Senior .NET Developer","company":{"id":3561,"name":"Inetum","domain":"inetum.com","url":"https://alion.io/company/inetum","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"A","score":85,"open_postings":555,"ghost_share":0,"stale_share":0.596,"repost_share":0,"time_to_fill_p50_days":34,"computed_at":"2026-10-10T05:45:15Z"}},"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":["Brussels, Belgium"],"countries":["BE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":46000,"max_usd":133000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6328},"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ASP.NET Core","optional":false},{"name":"C#","optional":false},{"name":"Rest API","optional":false},{"name":"SQL","optional":false},{"name":"Azure","optional":true},{"name":"ETL/ELT","optional":true}],"status":"live","first_seen_at":"2026-10-08T06:57:33Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-11T21:17:34Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Flemish Brabant / Brussels Region\nHybrid (3 days onsite)\nLong-term assignment\nFreelance\nAbout the Assignment\nFor an organization operating a complex, business-critical application landscape, we are looking for an experienced Senior .NET Technical Developer who enjoys combining hands-on development, technical leadership, and modernization initiatives.\nYou will join a team responsible for the continued development and evolution of a large-scale internal platform with a long history. In addition to delivering new functionalities, you will play a key role in driving improvements in architecture, performance, security, and maintainability.\nThis role is ideal for someone who takes ownership, embraces technical challenges, and is energized by improving complex application environments.\n Your Responsibilities\nHands-on development within a .NET environment\nAnalyze and improve existing architecture\nReduce technical debt and lead refactoring initiatives\nIdentify and resolve performance and security issues\nAdvise on technical decisions and modernization initiatives\nDesign future-proof solutions within an existing environment\nChallenge and guide technical stakeholders\nCollaborate closely with business stakeholders and development teams\nContribute to migration and continuous improvement programs\n Your Profile\nYou are a senior developer with a strong architectural background who enjoys remaining actively involved in development.\nMust-Have\nMinimum 10 years of experience in Microsoft development environments\nStrong knowledge of C# and .NET\nExperience with ASP.NET MVC\nIn-depth knowledge of .NET Framework environments\nExperience with modern .NET (.NET 6/7/8)\nStrong SQL Server expertise\nExperience with REST APIs and systems integration\nExperience working within complex legacy environments\nProven track record in modernization and migration projects\nStrong analytical and problem-solving skills\nExcellent communication skills with both technical and business stakeholders\n Dutch: professional working proficiency (spoken and written)\n English: professional working proficiency (spoken and written)\nNice to Have\nExperience with Azure\nKnowledge of IIS hosting\nExperience with WCF\nExperience with workflow or integration platforms\nKnowledge of ETL processes or job scheduling solutions\nExperience with performance optimization\nKnowledge of secure software development practices\nWho Are We Looking For?\nYou are someone who:\nQuickly understands technical complexity\nWorks independently\nTakes ownership and responsibility\nIs confident in constructively challenging technical decisions\nHas strong stakeholder management skills\nRemains pragmatic without compromising quality\nEnjoys bridging the gap between business and IT\n Practical Information\nHybrid working environment\n3 days onsite presence required\nFull-time engagement\nShort-term start possible\nLong-term assignment with stable future prospects\nInterested?\nAre you an experienced .NET professional looking to make a real impact in a challenging and evolving environment? 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