Senior Frontend Engineer

Company Description Who We Are 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! Job Description The Role As a Senior UI Software Engineer, you will join our globally distributed team to enhance the Cint Exchange's Ordering platform. Your mission is to deliver an exceptional user experience for buyers, ensuring rapid delivery of high-quality research answers. You will be a product-oriented UI engineer, taking full ownership of the user experience. This involves close collaboration with UX designers and product managers to understand customer goals and pain points, ultimately delivering an intuitive and frictionless UI for requesting, tracking, and managing research samples. We are committed to always developing our Next.js frontend platform, integrating with our Design System, and collaborating with backend engineers to ensure optimal API support for our customer and product needs.  You are a driver of quality and standards, willing to research new technologies and novel solutions to enhance our platform security, quality and performance. This includes writing A.D.R’s and deeply understanding end to end system flows. You are an innovator who embraces the future of development. You have hands-on experience with AI tooling such as skills, agentic workflows, and MCPs, and you understand AI technical best practices. You will leverage this knowledge to optimize our frontend engineering practices, accelerate delivery, and help envision how AI can enhance the user experience of the Cint platform.   Qualifications What You Will Do Collaborate with Product and UX design teams to develop best-in-class user experiences and participate in release cycles and product launches. Build efficient, reusable frontend abstractions and systems, contributing to our reusable design system. Identify and address performance bottlenecks. Participate in design and code reviews. Collaborate with team members to integrate and share innovations. Identify and communicate best practices for frontend engineering. Independently complete medium to large features. Drive tasks and build relationships across teams. Design and write well-organized code. Identify and drive improvements in existing code. Provide on-call support for your systems in production. What We Are Looking For 3-5+ years of software development experience in a fast-paced, innovative, and complex environment. Experience using technical writing and diagrams for brainstorming, design alignment, and cross-team communication. Proficiency in Next.js 13+ (including App Router) and React Query, with experience in data caching strategies and performance optimization. Proficiency in breaking down product documents and abstracts into well-defined feature epics and user stories, driving features from concept to reality promptly. Experience with CSS and Tailwind, and in working with Figma and internal design systems. Experience delivering seamless complex data visualizations with technologies like Highcharts or D3.js A proven ability to design and implement robust UI solutions using TypeScript, with a keen eye for detail in applying comprehensive typing across the entire stack, delivering maintainable and highly reliable user experiences." Experience writing effective unit and integration tests, including API mocks. Ability to review OpenAPI specifications and provide feedback on API contract designs. A driver in determining, implementing, and continuously improving architecture and security across systems, tools, and workflows.  Familiarity and experience with authentication and authorization services. Familiarity developing Cloud-Native applications, preferably on AWS. Familiarity with LLM tooling and capabilities (Skills, MCPs, Agentic flows) Bonus Points Experience with Vite, Shadcn, Radix, Playwright, Auth0, OTEL, Sentry, Terraform, Java, C#, Go, Python, Scala, or other technologies are a plus. We support learning new technologies and encourage full-stack development. Experience using LLM tools for advanced engineering workflows and AI orchestration, such as automating complex code migrations, structured data extraction, prompt evaluation, and managing context windows. Additional Information 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 . I'm interested I'm interested Privacy Notice Imprint I'm interested Refer a friend share this job Share to WeChat × Copy the link and open WeChat to share. Copy to clipboard Open WeChat Share to WeChat × Use Scan QR Code in WeChat and click ··· to share. Senior Frontend Engineer London, UK Full-time I'm interested I'm interested window.labels = window.labels || {} window.labels['li-share-success'] = "Job successfully shared" window.labels['li-share-conflict'] = "Job already shared" window.labels['li-share-error'] = "An error occurred when sharing a job" window.labels['continueBu