Senior Software Developer, Creative Solutions

👫 About the team At Equativ, we’re on a mission to develop advertising technologies that empower our customers to reach their digital business goals. This means that we rely on massively scalable, widely distributed, highly available, and efficient software systems; the platform deals with over 3 million requests per second (+250 billion/day) managed by 3,000 servers with less than 250ms response time. Our innovation team based in Paris, Nantes, Bordeaux, Limoges, Krakow and Berlin is composed of 150+ straightforward and energetic engineers working in an Agile environment and ready to tackle the most complex technical challenges. What you'll do ✏️ Work with Product, Design, and other Engineering teams to understand problems, define solutions, and make informed tradeoffs. Design, build, test, and maintain software across the stack, from user-facing tools and ad experiences to backend services and delivery systems. Take ownership of projects from investigation and technical design through deployment, monitoring, and iteration. Investigate production issues across system boundaries, using data and collaboration to understand their impact and fix the underlying problem. Build reliable, performant software that works at scale, and improve existing architecture and engineering practices along the way. Use AI coding agents as part of your workflow, review their output critically, and share useful approaches with the team. Contribute to code reviews, pairing, and technical discussions; mentor teammates and help make the team more effective. About you 💪 You have senior-level experience building and maintaining production software, with a strong foundation in JavaScript or TypeScript and backend or full-stack development. You can work through an ambiguous problem: ask questions, identify constraints, make decisions, and move toward a solution. You care about how software behaves in production, including reliability, performance, testing, and maintainability. You can work independently while keeping teammates informed, asking for help, and sharing context clearly. You want to understand the product and business reasons behind your work, not just implement a specification. You use AI tools in your day-to-day work and exercise your own judgment about when and how to use them. You understand and take responsibility for the code you ship. You're comfortable learning new technologies and working in unfamiliar parts of a system. Nice to have 🌟 Experience with Node.js, React, NestJS, Nx, Docker, SQL, or cloud platforms such as GCP. Experience with browser technologies, ad rendering, video, ad tech, or high-throughput distributed systems. Experience building with LLMs, whether an agent, an internal tool, an evaluation, or a product feature. Examples of improving how you or your team work, such as automating a recurring task or building a useful tool. Experience leading technical initiatives, mentoring teammates, or improving team practices. 👋 About us Equativ, a leading independent ad platform, brings scale and simplicity to digital advertising. Following its recent merger with Sharethrough and the acquisition of Kamino Retail, advertisers, media owners, and technology partners rely on Equativ’s advanced SSP, curation, and retail media services and technology to achieve maximum business outcomes. With a focus on privacy-first programmatic video, CTV, and data-driven solutions, Equativ enables clients to activate across the digital ecosystem while protecting consumer privacy. The company’s global expertise is also backed by a team of over 750 employees across 19 countries. As a proud recipient of the HappyIndex@Work label, Equativ is committed to providing a dynamic, flexible workplace where employees thrive, grow, and excel in both their professional and personal lives. Come and lead the charge with us in building a transparent ecosystem based on quality! ---------------------- Equativ is an equal opportunity employer. Equal access to employment, services, and programs are available to everyone, regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. If you require reasonable accommodation throughout the application and/or interview process, please contact the recruitment team at ta-team@equativ.com