{"id":708852,"url":"https://alion.io/job/jex-senior-back-end-developer-net-c","title":"Senior Back-end Developer (.NET / C#)","company":{"id":678634,"name":"JEX","domain":"jex.nl","url":"https://alion.io/company/jex-2","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Recruitee","truth_index":{"grade":"B","score":72,"open_postings":13,"ghost_share":0.462,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":39,"computed_at":"2026-11-02T06:13:15Z"}},"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":["Rotterdam, Netherlands"],"countries":["NL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":5000,"max":6000,"currency":"EUR","period":"month","gross":null,"usd_annual":80868},"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":"C#","optional":false},{"name":"Clean Architecture","optional":false},{"name":"Entity Framework Core","optional":false},{"name":"Grafana","optional":false},{"name":"MS SQL","optional":false},{"name":"Rest API","optional":false},{"name":"Sass","optional":false},{"name":"Scrum","optional":false}],"status":"live","first_seen_at":"2025-01-06T14:24:24Z","employer_posted_date":"2026-10-05","last_verified_at":"2026-11-02T14:25:47Z","board_verified":true,"closed_at":null,"days_open":665,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":664},"description":"Bouw mee aan dé totaaloplossing voor MKB-bedrijven als Senior Back-end Developer bij JEX. De basis staat, jij krijgt de vrijheid om door te ontwikkelen en écht impact te maken. Jouw focus ligt op slimme, schaalbare code en oplossingen die het verschil maken. Denk analytisch, handel proactief en werk samen met andere teams om innovatie naar de praktijk te brengen.\nDit vind jij leuk om te doen:\nAls Senior Back-end Developer draai je mee in een multidisciplinair Scrum team. Je bouwt mee aan een product dat onderdeel is van een cloud-based microservice landschap. Dit ga je doen:\nSamenwerken met collega’s van verschillende expertises;\n\nSlimme AI-oplossingen implementeren binnen onze software development lifecycle;\n\nTechnisch uitdenken, ontwikkelen en testen van nieuwe features;\n\nSchakelen tussen implementatiedetails en abstracties om software netjes ontkoppeld te houden;\n\nCollega’s ondersteunen bij vragen en uitdagingen;\n\nMeedenken over architectuur en best practices om het product toekomstbestendig te maken.\n\nHier herken jij jezelf in:\nJe bent een gedreven ontwikkelaar met een proactieve instelling. Dit heb je ook:\nMinimaal 5 jaar ervaring in een soortgelijke functie;\n\nErvaring met het opzetten van unittesten en integratietesten xUnit;\n\nBekend met Clean Architecture en S.O.L.I.D;\n\nKennis van de volgende technieken: C# .NET, REST API;\n\nBasiskennis van Entity Framework, MSSQL en SCSS;\n\nEen sterke Agile mindset;\n\nKennis van Azure, Grafana, MassTransit of NserviceBus ;\n\nGoede communicatieve vaardigheden in de Nederlandse taal.\n\nWat biedt JEX:\nEen salaris tussen de €5.000 en €6.000 (o.b.v. je ervaring, skills en potentie);\n\nEen riante optieregeling in aandelen van JEX;\n\nEen passende mobiliteitsvergoeding;\n\n30 vakantiedagen o.b.v. 40 uur en 8% vakantiegeld;\n\nInwisselbare feestdagen en de optie om extra vrije dagen bij te kopen of te verkopen;\n\nEen premievrije pensioenregeling;\n\nEen laptop en telefoon van de zaak;\n\nElke dag ontbijt, uitgebreide lunch en onbeperkt fruit, snacks en fris;\n\nEen gym en gebedsruimte in ons prachtige kantoor;\n\nHele toffe events op interne én externe locaties;\n\nEen in house skybar waar we de gezelligste borrels hebben;\n\nDiverse opleidingsmogelijkheden, wij moedigen je aan om de beste versie van jezelf te worden.\n\nRequirements\nHier kom je terecht\nBij JEX geloven we dat technologie bedrijven vooruit moet brengen. Slimmer werken, sneller groeien en meer focus op wat écht telt. Met toegankelijke tech- en AI-oplossingen automatiseren we complexe en tijdrovende processen voor B2B-organisaties.\nEnthousiast?\nDat snappen we! Deel je cv en motivatie en krijg binnen twee werkdagen na je sollicitatie bericht van ons. We zijn erg benieuwd naar wat jou bijzonder maakt. Tip: kort is de kunst, krachtig de key!","description_format":"text","description_chars":2758,"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":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Accounting & Tax Software"],"lifecycle":[{"event":"open","at":"2026-09-11T04:14:24Z"},{"event":"open","at":"2026-09-25T17:28:10Z"}],"visa":[],"liveness":{"score":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.22,"p_room":0.28,"age_days":664,"expected_fill_days":39,"reasons":["conf:3","ghost","win:tail","crowd:"],"computed_at":"2026-11-02T06:13:15Z"},"pay":{"stated_usd_annual":80868,"is_top_pay":false},"html_url":"https://alion.io/job/jex-senior-back-end-developer-net-c","json_url":"https://alion.io/job/jex-senior-back-end-developer-net-c.json","meta":{"generated_at":"2026-11-02T20:56:33Z","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":29292,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-03T00:00:00Z"}},"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":678634},"rest":"https://alion.io/mcp/rest/get_company?id=678634"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fjex-senior-back-end-developer-net-c"},{"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%2Fjex-senior-back-end-developer-net-c"},{"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%2Fjex-senior-back-end-developer-net-c"},{"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/jex-senior-back-end-developer-net-c\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fjex-senior-back-end-developer-net-c"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":708852}},{"tool":"search_jobs","arguments":{"company":"jex.nl","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":708852},"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"}}