Company DescriptionWho We AreCint 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.Job DescriptionThe RoleAs a Staff Software Engineer in our Supply domain, you won't just be writing features; We are leading the charge in modernizing our architecture; shifting from legacy systems and transitioning our ecosystem from Go toward a unified Java/Kotlin/Spring stack.

You will define the patterns and standards that guide this transition across the domain, spending roughly 20% of your time raising the bar for other engineers and 80% attacking our hardest technical problems, all with a high degree of autonomy and ownership.We build the critical infrastructure that manages and standardizes the flow of survey data to our global network of suppliers. We believe in strong collaboration and team work, high quality engineering, and providing the best possible experience for our customers.Design and implement patterns for legacy displacement to move domains out of our monolith with zero downtime.Level Up the Team: Multiply your impact by mentoring senior and mid-level engineers, raising the quality bar through design reviews, and growing the team's collective technical depth.Bridge Tech Stacks: Build new services and help transition others from GO to Spring while navigating and contributing to other codebases.Global Collaboration: Communicate effectively across timezones.





Master Observability: Use Grafana and modern tracing to monitor system health, ensuring our backend-heavy domain remains performant and reliable.Use it to deal with obvious problems and focus on the complex ones.Who You AreDeep Technical Expertise: You bring significant backend engineering experience (typically 10+ years) with the technical depth to be a go-to authority in performance-sensitive, production-critical systems.Fullstack-Minded Backend Expert: You have deep experience in backend systems and feel comfortable switching between languages. While backend is your priority, you don't shy away from the frontend; practical expertise in React sis highly welcomed.Quality Obsessed: You believe that code without a robust test suite (Unit, Integration, E2E) isn't finished.Global Impact: Your work powers a marketplace used by millions of people worldwideAdditional Information ValuesCollaboration is our superpowerWe uncover rich perspectives across the worldSuccess happens togetherWe deliver across borders.More About CintWe’re proud to be recognised in Newsweek’s 2025 Integral 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. ( Mid-Senior LevelIndustry: Computer Software

📌 Staff Software Engineer (Barcelona)
🏢 Cint
📍 Barcelona