As a Senior Software Engineer in the One Platform team , you'll have the opportunity to push our product and platform in new directions while also shaping the next iterations of the features our customers already love. You will be one of our first team members in our brand-new Barcelona office . You'll help drive the technical roadmap and implementation of our Internal and External API layers, our 3rd party integration platform and access management systems.
From high-performing APIs to backend algorithms, integration frameworks, to guaranteeing data privacy with access management rules, you'll hone your skills across multiple domains while helping to drive forward the Affinity product and vision.
For this role, we're embracing a hub-hybrid model, designed to balance flexibility with meaningful in-person collaboration. Team members in-office 2-days per week. Drive the technical best practices for our APIs, integrations and IAM systems that allow our platform to exceed its performance goals and customers expectations.
Promote operational excellence with focus on high reliability,



performance, and scalability
Studies have shown that women and people of color are less likely to apply to jobs unless they meet every qualification. You have ~7+ years of experience in software engineering, with at least 2+ years of experience as a senior member of a team delivering end-to-end systems.
You’ve worked with a variety of web APIs and developed backend services using modern OOP practices.
You have a strong understanding of relational databases and the ability to diagnose performance bottlenecks at the database layer.
You’re comfortable troubleshooting across network, application, caching, queuing, and storage layers
You've helped your teams solve high-scale challenges, integrate systems, or develop business intelligence platforms.
You communicate nuanced ideas clearly, whether you're explaining technical decisions in writing or brainstorming in real time.
Proficient in English
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📌 Senior Software Engineer (Barcelona)
🏢 Affinity
📍 Barcelona