Permanent Regular : Senior Product Engineer and become a key contributor to our mission of revolutionizing employee compensation. You'll own features end-to-end — backend, frontend, and the AI-assisted workflows that let one engineer move fluidly across the stack — inside one of our core domains.

Benefits isn't a simple CRUD layer — it's a rich domain with multi-tenant configurations, eligibility rules that vary by company and country, tax compliance requirements, and real-time state that must always be consistent. Covers areas like health insurance, pensions, custom benefits, food and transport, childcare, training, and renting. A high-performance team dedicated to resilient, mission-critical systems where transactional precision, idempotency, and fault tolerance are at the heart of everything.

Leaders — The Leaders domain covers the employee-facing mobile and web experience within the Cobee platform, managing personal data, benefit visibility, and privacy compliance (GDPR/LPD). A domain where company-level configuration, data integrity, and cross-region consistency matter as much as UX.

Own Features

End-to-End: Take a feature from domain design through backend services to the UI that ships it, and the observability that tells you it's working. Build and optimize robust software capable of handling high-volume traffic while ensuring data consistency and system reliability, evolving existing systems into scalable, event-driven architectures as product requirements grow. Understand the complexities of existing systems and evolve them into scalable, event-driven architectures to meet future general product requirements.

You will champion comprehensive automated testing (unit, integration, and e2e) and run advanced load and performance simulations to guarantee rock-solid stability Share your expertise through deep code reviews, mentoring junior engineers,



and documenting engineering standards that elevate the entire squad. Actively leverage AI tools and coding assistants on a daily basis to accelerate development cycles (SDD), automate repetitive tasks, and optimize overall team processes and delivery speed powered by AI Agents. Node.js (TypeScript), NestJS (or similar frameworks), React, React Native.

Data & State: MongoDB (Atlas), Redis for caching and distributed locking and PostgreSQL.

Infrastructure: Docker, Kubernetes, GitLab CI/CD (deploying multiple times daily). Sentry and Datadog/New Relic for real-time monitoring and PostHog. GitHub Copilot, Claude, ChatGPT, and other GenAI assistants. GitHub, GitLab, Teams, JIRA, Confluence.

Proven Senior Expertise: 5+ years of experience building production-grade applications, full-stack or with strong ability to work across layers. (Experience within Typescript ecosystem will be a plus.) Comfort working across backend and frontend, using AI tooling to close gaps in unfamiliar territory. Deep understanding of race conditions, eventual consistency, idempotency, and message brokers. The "Payments Mindset": experience with banking systems, payment gateways (Stripe, Adyen, etc.), ledger systems, or reconciliation processes will be a plus.

Deep understanding of race conditions, eventual consistency, idempotency, and message brokers is a must.

Quality First: Extensive experience with automated testing patterns and a "shift-left" security mindset. Spanish & English fluency. Our business model delivers not just for individuals but their communities too, by supporting local businesses and economies.

Turn inspiration into possibility Get space to try new ideas, experiment and move the world of work forward as you bring new digital experiences - and moments of connection - to millions of people. Make a positive impact Touch millions of lives and create meaningful change for people and the world we share, supporting our commitments to diversity, sustainability, and local economies.

📌 Constructeur/ Engineer (San Fernando de Henares)
🏢 Pluxee España
📍 San Fernando de Henares