Senior Front-end Developer (React, TypeScript, English)

Agency :

Ekino

Job Description :

Ekino helps organizations transform tech ambition into business reality.

Through 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.

We 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.

As 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.

The Ekino Group consists of 500 consultants and technical experts based in France (Paris & Bordeaux) and Vietnam (Ho Chi Minh City).

ekino in Vietnam

Ekino has been operating in Ho Chi Minh City since 2013, with around 160 employees.

We 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.

Senior Front-end Developer

The 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.

Job description

• Design and develop scalable, high-performance web applications using React and TypeScript.
• Drive performance optimization through rendering strategies, code splitting, caching, and bundle management.
• Define and implement front-end architecture, state management, and reusable component systems.
• Participate in Agile development, including technical discussions, estimation, and code reviews.
• Enforce clean, testable code, strong practices in testing, CI/CD, and design patterns.
• Collaborate closely with Product, UX/UI, and Backend teams to translate complex requirements into scalable solutions.
• Lead junior developers, provide technical guidance, and support problem-solving on complex frontend challenges.
• Contribute to technical roadmap and strategic decisions.

Desired Skills and Experience

• 5+ years' hands-on experience with React and TypeScript: hooks, context, composition, and performance patterns.
• Solid 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.
• Strong HTML5 and modern CSS: semantic markup, SCSS, scoped styling, responsive design, and cross-browser discipline.
• Experience with design system integration: token-based theming, reusable components, and Storybook (or equivalent).
• Bundle discipline: code splitting, lazy loading, and bundle size awareness.
• Hands-on unit and component testing with Jest or Vitest and Testing Library; familiarity with E2E testing (Playwright or Cypress).
• Familiarity with Git-based workflows, CI/CD pipelines, and code review processes.
• Understanding of accessibility standards, including WCAG AA compliance, semantic markup, assistive technology support, and accessibility testing methodologies.
• Experience integrating front-end applications with APIs, external systems, and third-party services: validation, error handling, privacy requirements, and resilient user journeys.
• Good communication in English, written and spoken.
• Comfortable in brownfield code and TMA work: reads and understands before rewriting, favors targeted fixes, and works with hotfix and SLA discipline.
• Communication and collaboration skills: able to work independently and in a team environment.

Nice-to-have skills

• Micro-frontend architecture: independently deployed front-end applications while ensuring effective versioning, isolation, interoperability, and scalability.
• AEM exposure: how a CMS component embeds and configures an external front-end app, author vs publish, dispatcher caching.
• Multi-brand or multi-locale platform experience.
• Automotive experience.

Why ekino?

• High-ownership working environment: You will take full responsibility and control of your missions contributing to the team's success.
• Continuous skill improvement with new technologies, challenging projects, on-the-job coaching, and training programs.
• Annual performance review & bonus: recognize your efforts and identify development/ improvement needs.
• Clear career path: define your career development with long-term vision.
• Be secured in your mind with employee’s care: private healthcare insurance package, medical check-up, support allowance...
• Great-place-to-work activities (company trip, sport clubs...): enhance teamwork spirit and facilitate your work-life harmony.

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To apply for this position, please kindly submit your resume via this link.

Thank you for your time and enthusiasm in our career opportunities.

Please 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.

#LI-TL1

Contract Type :

Temporary

Here 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.