{"id":1372282,"url":"https://alion.io/job/havas-senior-front-end-developer-react-typescript-english","title":"Senior Front-end Developer (React, TypeScript, English)","company":{"id":3592,"name":"Havas","domain":"havas.com","url":"https://alion.io/company/havas","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":75,"open_postings":111,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":29,"computed_at":"2026-10-10T05:45:15Z"}},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Ho Chi Minh City, Vietnam"],"countries":["VN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"AI Agents","optional":false},{"name":"CI/CD","optional":false},{"name":"Drupal","optional":false},{"name":"Java","optional":false},{"name":"Magento","optional":false},{"name":"Node JS","optional":false},{"name":"PHP","optional":false},{"name":"React.js","optional":false},{"name":"State Management","optional":false},{"name":"Symfony","optional":false},{"name":"TypeScript","optional":false},{"name":"WordPress","optional":false},{"name":"C#","optional":true},{"name":"Cypress","optional":true},{"name":"Git","optional":true},{"name":"JavaScript","optional":true},{"name":"Jest","optional":true},{"name":"Playwright","optional":true},{"name":"Sass","optional":true},{"name":"SLI/SLO/SLA","optional":true},{"name":"Storybook","optional":true},{"name":"Vitest","optional":true}],"status":"closed","first_seen_at":"2026-09-24T00:00:00Z","employer_posted_date":"2026-09-24","last_verified_at":"2026-10-03T15:27:30Z","board_verified":false,"closed_at":"2026-10-03T15:27:30Z","days_open":9,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":9},"description":"Agency :\nEkinoJob Description :\nEkino helps organizations transform tech ambition into business reality.\nThrough Serious Tech for Business, we combine enterprise-grade engineering, AI-powered delivery, and AI governance capabilities to build secure, reliable, and scalable digital platforms. Our mission is to help businesses operate, innovate, and grow with confidence in an increasingly Agentic world.\nWe design and build innovative solutions with an Agentic approach, ensuring alignment with business objectives while maintaining the highest standards of security, reliability, sovereignty, and traceability. Our solutions are integrated with legacy systems (e-commerce, billing, provisioning, leads, CRM,...) and help business and digital managers to meet their objectives.\nAs part of the Havas Group, we collaborate with other agencies across the network or directly serve APAC, European and American clients. Powered by HavasCX, our global network brand, we bring together over 1,200 specialists in digital transformation, eCommerce, customer experience design, customer acquisition, and engagement across Havas agencies worldwide.\nThe Ekino Group consists of 500 consultants and technical experts based in France (Paris & Bordeaux) and Vietnam (Ho Chi Minh City).\nekino in Vietnam\nEkino has been operating in Ho Chi Minh City since 2013, with around 160 employees.\nWe are specialised in Sage X3, Digital Architecture, eCommerce, Web Platforms, Mobile and Responsive Apps; Agile Development; ReactJS; AngularJS; NodeJS; Java; .Net; PHP (Symfony, WordPress, Drupal, Magento 2), User Experience, User Interface, Service Design; Cloud Services, DevOps.\n\nSenior Front-end Developer\nThe role will develop React front-end applications and components integrated into an existing enterprise CMS platform (Adobe Experience Manager), across several brands. Mostly TMA/ evolutive maintenance on an existing codebase, under French onshore technical supervision.\nJob description\nDesign and develop scalable, high-performance web applications using React and TypeScript.\nDrive performance optimization through rendering strategies, code splitting, caching, and bundle management.\nDefine and implement front-end architecture, state management, and reusable component systems.\nParticipate in Agile development, including technical discussions, estimation, and code reviews.\nEnforce clean, testable code, strong practices in testing, CI/CD, and design patterns.\nCollaborate closely with Product, UX/UI, and Backend teams to translate complex requirements into scalable solutions.\nLead junior developers, provide technical guidance, and support problem-solving on complex frontend challenges.\nContribute to technical roadmap and strategic decisions.\nDesired Skills and Experience\n5+ years' hands-on experience with React and TypeScript: hooks, context, composition, and performance patterns.\nSolid understanding of rendering modes (CSR, SSR, SSG) and hydration, including how to diagnose and fix a hydration mismatch, and their impact on SEO, Core Web Vitals, caching, and personalization.\nStrong HTML5 and modern CSS: semantic markup, SCSS, scoped styling, responsive design, and cross-browser discipline.\nExperience with design system integration: token-based theming, reusable components, and Storybook (or equivalent).\nBundle discipline: code splitting, lazy loading, and bundle size awareness.\nHands-on unit and component testing with Jest or Vitest and Testing Library; familiarity with E2E testing (Playwright or Cypress).\nFamiliarity with Git-based workflows, CI/CD pipelines, and code review processes.\nUnderstanding of accessibility standards, including WCAG AA compliance, semantic markup, assistive technology support, and accessibility testing methodologies.\nExperience integrating front-end applications with APIs, external systems, and third-party services: validation, error handling, privacy requirements, and resilient user journeys.\nGood communication in English, written and spoken.\nComfortable in brownfield code and TMA work: reads and understands before rewriting, favors targeted fixes, and works with hotfix and SLA discipline.\nCommunication and collaboration skills: able to work independently and in a team environment.\nNice-to-have skills\nMicro-frontend architecture: independently deployed front-end applications while ensuring effective versioning, isolation, interoperability, and scalability.\nAEM exposure: how a CMS component embeds and configures an external front-end app, author vs publish, dispatcher caching.\nMulti-brand or multi-locale platform experience.\nAutomotive experience.\nWhy ekino?\nHigh-ownership working environment: You will take full responsibility and control of your missions contributing to the team's success.\nContinuous skill improvement with new technologies, challenging projects, on-the-job coaching, and training programs.\nAnnual performance review & bonus: recognize your efforts and identify development/ improvement needs.\nClear career path: define your career development with long-term vision.\nBe secured in your mind with employee’s care: private healthcare insurance package, medical check-up, support allowance...\nGreat-place-to-work activities (company trip, sport clubs...): enhance teamwork spirit and facilitate your work-life harmony.\n---\nTo apply for this position, please kindly submit your resume viathis link.\nThank you for your time and enthusiasm in our career opportunities.\nPlease kindly note that shortlisted candidates will be contacted within 3 weeks of application. Alternatively, we will reach out to you when another suitable chance arises in the future.\nContract Type :\nTemporaryHere at Havas across the group we pride ourselves on being committed to offering equal opportunities to all potential employees and have zero tolerance for discrimination. We are an equal opportunity employer and welcome applicants irrespective of age, sex, race, ethnicity, disability and other factors that have no bearing on an individual’s ability to perform their job.","description_format":"text","description_chars":6028,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"},{"name":"Vietnam","iso":"VN","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Advertising","Creative Agencies","Personal Development"],"lifecycle":[{"event":"open","at":"2026-09-28T04:29:56Z"},{"event":"close","at":"2026-10-03T15:27:30Z"}],"visa":[],"liveness":null,"pay":null,"html_url":"https://alion.io/job/havas-senior-front-end-developer-react-typescript-english","json_url":"https://alion.io/job/havas-senior-front-end-developer-react-typescript-english.json","meta":{"generated_at":"2026-10-11T23:15:55Z","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":14072,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-12T00:00:00Z"}},"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":3592},"rest":"https://alion.io/mcp/rest/get_company?id=3592"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fhavas-senior-front-end-developer-react-typescript-english"},{"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%2Fhavas-senior-front-end-developer-react-typescript-english"},{"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%2Fhavas-senior-front-end-developer-react-typescript-english"},{"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/havas-senior-front-end-developer-react-typescript-english\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fhavas-senior-front-end-developer-react-typescript-english"}]}