Senior Software Engineer at Cint in Barcelona, Catalonia, Spain

companyDescription 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! jobDescription The Role As a Senior Software Engineer in our Supply domain, you won't just be writing features; you will be architecting the future of our platform. In 2026, our primary mission is foundational modernization. We are leading the charge in modernizing our architecture; shifting from legacy systems and transitioning our ecosystem from GO toward a unified Java/Spring stack. The Team The Supply domain is composed of talented engineers distributed in multiple countries across Europe and the US. 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. What You’ll Do Collaborate on this modernization journey: Design and implement patterns for legacy displacement to move domains out of our monolith with zero downtime. Bridge Tech Stacks: Build new services and help transition others from .NET to Spring while navigating and contributing to other codebases. Product Collaboration: Partner with product managers to question and form requirements, understand the "Why", and help shape a roadmap that balances technical debt with new value. Global Collaboration: Communicate effectively across timezones. Your written documentation and async communication will be the glue for our distributed team. Master Observability: Use Grafana and modern tracing to monitor system health, ensuring our backend-heavy domain remains performant and reliable. Drive AI Efficiency: Leverage Agentic programming tools (like Claude Code) to accelerate refactoring and development workflows. Use it to deal with obvious problems and focus on the complex ones. Who You Are 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. Collaborative Team Player: You have a strong collaboration mindset. You believe that success happens together and you actively seek to mentor others and share knowledge across the team Systems Thinker: You are comfortable with event-driven systems, and have a proven track record of breaking down monoliths and managing system migrations. Quality Obsessed: You believe that code without a robust test suite (Unit, Integration, E2E) isn't finished. Pragmatic & Curious: You have a strong product mindset. You don’t just take tickets; you seek to understand the business impact of your architectural choices. Observability Advocate: You don't wait for a crash to know there's a problem; you build systems that tell you how they're performing. Working at Cint Remote-First: Work from anywhere where Cint operates with a setup that supports your best work. High Autonomy: We trust our engineers to make sound decisions and own their work end to end. Global Impact: Your work powers a marketplace used by millions of people worldwide qualifications additionalInformation #LI-Remote 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. 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.