{"id":2851390,"url":"https://alion.io/job/coolblue-senior-front-end-reactnext-js-developer-2","title":"Senior Front-End React/Next.js 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":76,"open_postings":25,"ghost_share":0,"stale_share":0.96,"repost_share":0,"time_to_fill_p50_days":40,"computed_at":"2026-10-20T05:45:00Z"}},"role":"Frontend","role_family":"Frontend","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":53000,"max_usd":111000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":12},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"GitHub","optional":false},{"name":"JavaScript","optional":false},{"name":"Next.js","optional":false},{"name":"Node JS","optional":false},{"name":"React.js","optional":false},{"name":"Sass","optional":false},{"name":"Scrum","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-10-19T11:43:00Z","employer_posted_date":"2026-10-19","last_verified_at":"2026-10-20T21:51:45Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"What does a Senior Front-end Developer at Coolblue do?\nAs a Senior Front-End React/Next.js Developer, you will take the lead in developing user interface components and implementing them using modern front-end technologies, including React.js and Next.js. Your primary responsibility remains the front end, while bringing a strong full-stack mindset to architectural and technical decisions. You will collaborate with UX Designers to create solutions that deliver high-quality user experiences and present them to the team. You will be involved in critical decision-making around architecture, processes, and tools, and be responsible for ensuring the overall performance and maintainability of the solutions. You will mentor junior and medior developers, provide guidance, and share your knowledge with the team. Would you also like to become a Senior Front-End Developer at Coolblue? Read below if the job suits you.\nYou enjoy doing this:\nLeading the development and implementation of performant, user-friendly applications using React.js and Next.js.\nReviewing and improving application requirements, interface designs, and web-based user interactions.\nContributing to back-end logic such as APIs and server-side functionality using technologies like Node.js or C# when needed.\nMaking critical technical decisions regarding architecture, tools, and processes.\nCollaborating with team members across diverse backgrounds and nationalities.\nWorking with GitHub and writing automated tests to ensure software quality.\nLeading in a fast-paced Continuous Integration & Deployment environment.\nCoaching and mentoring junior and medior developers to elevate team skills.\n Money.\nWorking together in an international environment with colleagues from the Netherlands, Belgium, Spain, Brazil, Mexico, Italy, and many more. \nAn extraordinarily good work environment. Where we interact as friends and you can just be yourself.\nMonthly drinks, freshly prepared snacks, legendary Coolblue parties and the best team activities.\nA fine balance between working at the office and working from home. Of course, we’ll help you create the best home-office possible. Including desk chair, laptop, and blue garlands.\nPlenty of room for your own ideas, initiatives and choices. You do your work your way.\nTravel allowance, a retirement plan and an allowance when you work from home.\n25 leave days. As long as you promise to come back.\nA picture-perfect office at a great location. You could crawl to work from Rotterdam Central Station. We recommend just walking for 2 minutes, though.\nWith over 100 training courses in our own Coolblue University, you become a little better every day.\nA discount on all our products.\n You have 5+ years of experience as a Front-End React/Next.js Developer.\nYou have a BSc or MSc in Computer Science or a comparable field.\nYou have advanced experience with TypeScript and React.js/Next.js concepts.\nYou have extensive experience with modern JavaScript (ES2017+), HTML, and CSS/SCSS.\nYou are highly proficient with React.js and Next.js.\nYou have experience with a Back-End runtime environment such as Node.js or C# (.NET) and understand how back-end choices impact front-end architecture.\nYou have experience leading and mentoring teams and making technical decisions.\nWorking with Scrum/Agile is second nature to you.\nYou are fluent in English.\nYou live in The Netherlands.\n As a Front-End React/Next.js Developer, you will help improve the user experience of our web applications at Coolblue, while being comfortable working across the full stack when needed. This role is primarily front-end focused, with hands-on full-stack expectations including back-end development in TypeScript and C#.","description_format":"text","description_chars":3705,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":["Retirement plans"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["E-commerce Platforms","Home Appliances"],"lifecycle":[{"event":"open","at":"2026-10-19T13:25:20Z"}],"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":40,"reasons":["conf:1","stale_co","win:early"],"computed_at":"2026-10-20T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/coolblue-senior-front-end-reactnext-js-developer-2","json_url":"https://alion.io/job/coolblue-senior-front-end-reactnext-js-developer-2.json","meta":{"generated_at":"2026-10-20T23:34:05Z","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":27179,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-21T00:00:00Z"}},"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-senior-front-end-reactnext-js-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-senior-front-end-reactnext-js-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-senior-front-end-reactnext-js-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-senior-front-end-reactnext-js-developer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcoolblue-senior-front-end-reactnext-js-developer-2"}]}