Senior Frontend / Fullstack Engineer

Cint; Belgique; Sur place; EUR 85 000 - 140 000; Plein temps

Avantages offerts par ce poste

Health insurance

Wellness stipend

Résumé du poste

Cint is seeking a Senior Frontend or Full-stack Engineer to join our product engineering team in Belgium. You will own features end to end—from design to testing and deployment—primarily using React, TypeScript, and modern frontend patterns.

You’ll collaborate with designers, product managers, and other engineers, contribute to design systems, and have opportunities to work with .NET backends. We value craftsmanship, code quality, and shared standards.

Qualifications

• 4+ years of frontend or full-stack development experience.
• Strong React (hooks, functional components) and TypeScript proficiency.
• Experience owning design, coding, testing, deployment and monitoring.
• Familiarity with design tools such as Figma and Storybook.

Responsabilités

• Build and maintain product features with React across our product line.
• Own the full development lifecycle from design to deployment and monitoring.
• Write clean, well-tested code and participate in code reviews.
• Collaborate with cross-functional teams to define frontend standards and tooling.
• Debug production issues and contribute to frontend architecture decisions.
• Contribute to backend development on .NET services when needed.
• Stay current with frontend ecosystem and bring new tools to the team.
• Mentor other engineers and help raise engineering standards.

Connaissances

React

TypeScript

JavaScript

UI/UX collaboration

CI/CD

Testing

Design systems

Storybook

Agile methodologies

Communication

Formation

Bachelor's degree in Computer Science or related field

Outils

.NET

Git

REST APIs

CI/CD tooling

Description du poste

Cint is a pioneer in research technology (ResTech). Our customers use the Cint platform to post questions and get answers from real people to build business strategies, confidently publish research, accurately measure the impact of digital advertising, and more.

The Cint platform is built on a programmatic marketplace, which is the world’s largest, with nearly 300 million respondents in over 150 countries who consent to sharing their opinions, motivations, and behaviours.

We are feeding the world’s curiosity!

We're looking for an experienced Senior Frontend or Full-stack Engineer to join our product engineering team and help drive the evolution of our existing product suite, built on modern React.

You’ll own features end to end — from technical design through implementation, testing, and deployment — and you’ll be a key voice in how our organization approaches frontend and UI engineering more broadly.

You’ll regularly partner with engineers, designers, and product managers on other teams to align on shared patterns, standards, and tooling, so the products we build feel consistent and our teams don't reinvent the wheel independently.

If you enjoy owning your work fully, care about the craft of frontend engineering, and want a seat at the table when cross-team technical decisions are made, this role is built for you. Experience on the backend — especially .NET — is a strong plus and opens the door to broader full-stack ownership within our team.

What You’ll Do: Key Responsibilities

• Build and maintain product features using modern React (hooks, component architecture, state management) across our existing product line.
• Own the full development lifecycle for your work — from technical design and implementation, through automated testing (unit, integration, and end-to-end), to CI/CD deployment and post-release monitoring.
• Write clean, maintainable, well-tested code, and hold that same bar in code reviews for your teammates.
• Collaborate with external/cross-functional teams — other engineering squads, design, and product — to define and evolve a common approach to frontend and UI development (shared component libraries, design systems, coding standards, tooling, and best practices).
• Debug and resolve production issues, working with observability and monitoring tools to identify root causes and prevent recurrence.
• Participate in architectural decisions for the frontend, including framework/library choices, performance optimization, accessibility, and scalability of the UI layer.
• Contribute to sprint planning, estimation, and agile ceremonies, helping the team plan and deliver predictably.
• Mentor and support other engineers, sharing knowledge on frontend best practices and helping raise the overall engineering bar.
• (If applicable) Contribute to backend development, particularly on .NET-based services, APIs, and integrations that power the products you work on.
• Stay current with the evolving frontend ecosystem and bring relevant new tools, patterns, and practices back to the team.

What We Are Looking For: Required Qualifications

Core experience:

• 4+ years of professional experience in frontend or full-stack development.
• Strong, hands-on expertise with modern React (hooks, functional components, context/state management, performance optimization).
• Solid command of JavaScript/TypeScript, HTML5, and CSS3 (TypeScript is our standard, and experience with it is expected).
• Proven experience owning the entire development cycle: design, coding, testing, code review, deployment, and monitoring — not just writing features and handing them off.
• Familiarity with common design tools such as Figma and Storybook

Testing & delivery

• Practical experience with frontend testing methodologies and tools (e.g., Jest, React Testing Library, Playwright, Cypress, or equivalent) covering unit, integration, and end-to-end testing.
• Experience working with CI/CD pipelines and deployment workflows, and a good understanding of what “production-ready” means.
• Comfort with debugging and troubleshooting issues across the stack, including in production environments.

Collaboration & communication

• Demonstrated ability to communicate and align with external/other engineering teams — someone who can drive consensus on shared frontend standards, not just implement their own.
• Strong written and verbal communication skills; comfortable presenting technical trade-offs to both engineers and non-technical stakeholders.
• Experience working in agile/scrum environments (sprint planning, stand-ups, retrospectives).

Engineering practices

• Familiarity with modern frontend architecture concepts: component-driven design, design systems, state management patterns, accessibility (a11y), and performance/optimization techniques.
• Understanding of responsive design, cross-browser compatibility, and web fundamentals (DOM, network behavior, rendering).
• A pragmatic approach to using AI-assisted development tools — someone who can direct and verify AI-generated code, not just accept it.

Nice to have

• Backend development experience, ideally on the .NET / C# platform (building or consuming REST APIs, working with a relational database, understanding of service-oriented or microservice architectures).
• Experience with monorepos, micro-frontend architectures, or contributing to internal component/design-system libraries.
• Prior experience in a role that spanned multiple teams or products, requiring you to negotiate technical standards across organizational boundaries.

Education

• Bachelor's degree in Computer Science, Engineering, or a related field — or equivalent practical experience.

Our Values

Collaboration is our superpower

• We uncover rich perspectives across the world
• Success happens together
• We deliver across borders.

Innovation is in our blood

• We’re pioneers in our industry
• Our curiosity is insatiable
• We bring the best ideas to life.

We do what we say

• We’re accountable for our work and actions
• Excellence comes as standard
• We’re open, honest and kind, always.

We are caring

• We learn from each other’s experiences
• Stop and listen; every opinion matters
• We embrace diversity, equity and inclusion.

More About Cint

We’re proud to be recognised in Newsweek’s 2025 Global Top 100 Most Loved Workplaces®, reflecting our commitment to a culture of trust, respect, and employee growth.

In June 2021, Cint acquired Berlin-based GapFish – the world’s largest ISO certified online panel community in the DACH region – and in January 2022, completed the acquisition of US-based Lucid – a programmatic research technology platform that provides access to first‑party survey data in over 110 countries.

Cint Group AB (publ), listed on Nasdaq Stockholm, this growth has made Cint a strong global platform with teams across its many global offices, including Stockholm, London, New York, New Orleans, Singapore, Tokyo and Sydney. (www.cint.com)

Additionally, in a world of AI, we want our candidates to understand our approach to the use of AI during the interview and hiring process, so we'd appreciate you reading our AI usage guide.