{"id":2462639,"url":"https://alion.io/job/coolblue-c-developer-2","title":"C# Developer","company":{"id":54499,"name":"Coolblue","domain":"coolblue.nl","url":"https://alion.io/company/coolblue","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"B","score":79,"open_postings":24,"ghost_share":0,"stale_share":0.833,"repost_share":0,"time_to_fill_p50_days":41,"computed_at":"2026-10-14T06:34:16Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","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":null,"salary_estimate":{"min_usd":59000,"max_usd":106000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":50},"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"AWS","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Clean Architecture","optional":false},{"name":"Datadog","optional":false},{"name":"DynamoDB","optional":false},{"name":"GitHub","optional":false},{"name":"GraphQL","optional":false},{"name":"JavaScript","optional":false},{"name":"MySQL","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"Scrum","optional":false},{"name":"TeamCity","optional":false}],"status":"live","first_seen_at":"2026-10-13T08:47:00Z","employer_posted_date":"2026-10-13","last_verified_at":"2026-10-14T14:25:30Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"What does a C# Developer at Coolblue do?\nAs a C# Developer, you're responsible for maintaining and developing products that support your domain together with your team. You do this by writing maintainable, testable and future-proof code. You also regularly participate in brainstorm sessions on user experience, data, and task flow with the UX Designer, Product Owner, and Data Scientist in your domain. Want to become a C# Developer at Coolblue? Read below if it suits you.\nOur toolkit is packed with:\nProgramming language: C# .NET 8.0\nData storage: Oracle, MySQL, PostgreSQL en DynamoDB.\nCloud platform: AWS\nCI/CD: Github en TeamCity\nLogging/Monitoring: Datadog\nYou enjoy doing this\nSolving problems with the best practices and principles that we've embraced, such as Clean Architecture, TDD/BDD, SOLID, and design patterns.\nWriting automated tests so you know that the quality of your software is on point.\nWorking with various types of data storage, such as Oracle, MySQL, and DynamoDB.\nShow ownership over the solutions in the portfolio of your domain by solving challenges in time by logging and monitoring Datadog.\nSharing knowledge by mentoring, pair programming sessions, and adding constructive comments to pull requests from colleagues in Github.\nGetting space to keep developing and to delve into the latest technologies.\nGiving and receiving constructive feedback\nPresenting deliverables during sprint demos\n Money.\nMonthly drinks, freshly made food, legendary Coolblue parties, and the greatest team activities.\nA nice combination of working at the office and from home. Of course, we'll make sure that you have a great home office. Including desk chair, laptop, and blue garlands.\nPlenty of room for your own ideas, initiatives, and choices. You do your work in your own way.\nTravel allowance, pension plan, and an allowance for when you work from home.\n25 vacation days. If you promise to come back.\nA discount on all products we sell.\nAn office you want to take photos of at a great location. It takes only 3 jumps from Rotterdam Central Station to get there. Or a 2-minute walk.\nMore than 30 courses in our own Coolblue University to become a little bit better every day.\n At least 3+ years (medior) or 6+ years (senior) of experience as a C# developer.\nYou have a Bachelor's or Master's degree in Computer Science or a comparable field.\nGood experience with software architecture and building application in .NET 8.0. \nYou have experience with Web API or MVC (REST and GraphQL) in .NET.\nKnowledge of designing, setting up, and maintaining cloud-native microservices, preferably in AWS.\nYou're very familiar working with Scrum/Agile.\nExperience with front-end development (React), JavaScript, HTML5, and CSS is a plus.\nBeing able to automate and implement repetitive tasks in a CI/CD platform. Experience with Teamcity is even better.\nYou speak English very well\n Together with the developers from your team, you design, realize, and maintain the software that brings a smile to the faces of your colleagues and our customers.","description_format":"text","description_chars":3044,"description_truncated":false,"requirements":{"experience_years_min":6,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":["Home office"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["E-commerce Platforms","Home Appliances"],"lifecycle":[{"event":"open","at":"2026-10-13T17:42:55Z"}],"visa":[],"liveness":{"score":60,"band":"ok","label":"Likely open","p_open":1,"p_active":0.602,"p_room":1,"age_days":0,"expected_fill_days":41,"reasons":["conf:0","stale_co","win:early"],"computed_at":"2026-10-14T06:34:16Z"},"pay":null,"html_url":"https://alion.io/job/coolblue-c-developer-2","json_url":"https://alion.io/job/coolblue-c-developer-2.json","meta":{"generated_at":"2026-10-14T17:08:22Z","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":21911,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-15T00:00:00Z"}},"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":54499},"rest":"https://alion.io/mcp/rest/get_company?id=54499"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcoolblue-c-developer-2"},{"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%2Fcoolblue-c-developer-2"},{"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%2Fcoolblue-c-developer-2"},{"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/coolblue-c-developer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcoolblue-c-developer-2"}]}