Senior Product Engineer: End-to-End, AI-Driven Platforms

Pluxee; Madrid; On-site; EUR 70,000 - 100,000; Full time

Job summary

Pluxee is seeking a Senior Product Engineer in Madrid to own end-to-end features across backend, frontend, and AI-assisted workflows within core Cobee domains. You’ll influence payments, benefits, and leaders experiences while ensuring resilience, data integrity, and scalable architectures.

You’ll collaborate across multi-region deployments, mentor juniors, and drive automated testing and observability. Strong TypeScript/Node.js skills and 5+ years of production-grade experience are expected.

Qualifications

• 5+ years of experience building production-grade applications, full-stack or across layers.
• Comfort working across backend and frontend, leveraging AI tooling to close gaps in unfamiliar territory.
• Deep understanding of race conditions, eventual consistency, idempotency, and message brokers.
• Experience with banking systems, payment gateways (Stripe, Adyen) and ledgers/reconciliation processes is a plus.
• Spanish & English fluency.

Responsibilities

• Own Features End-to-End: from domain design through backend services to the UI that ships it.
• Design for resilience at scale: build robust software for high-volume traffic with data consistency.
• Evolve distributed architectures into scalable, event-driven systems.
• Champion automated testing (unit/integration/e2e) and run load/performance simulations.
• Monitor service health in production and use observability tools to identify bottlenecks.
• Provide technical leadership via code reviews, mentoring, and documenting standards.
• Leverage AI tools daily to accelerate development and improve team efficiency.

Skills

Senior experience

Full-stack

AI tooling

Distributed systems

Payments domain

English fluency

Tools

Node.js

NestJS

React

React Native

MongoDB

PostgreSQL

Redis

Docker

Kubernetes

GitLabCI/CD

Sentry

Datadog

PostHog

GitHub Copilot

Job description

Pluxee is seeking a Senior Product Engineer in Madrid to own end-to-end features across backend, frontend, and AI-assisted workflows within core Cobee domains. You’ll influence payments, benefits, and leaders experiences while ensuring resilience, data integrity, and scalable architectures.

You’ll collaborate across multi-region deployments, mentor juniors, and drive automated testing and observability. Strong TypeScript/Node.js skills and 5+ years of production-grade experience are expected.