Senior Product Engineer

PLUXEE ESPAÑA SAU; Madrid; On-site; EUR 85,000 - 110,000; Full time

Job summary

Pluxee España SAU in Madrid is seeking a Senior Product Engineer who will own features end-to-end—from backend services to the UI—and contribute to AI-assisted workflows that accelerate development.

You will work across core domains (Benefits, Payments, Leaders, Managers App) to design resilient, scalable systems, champion testing, observability, and cross‑functional collaboration in a fast‑growing fintech environment.

Qualifications

• 5+ years of hands-on product or platform development experience.
• Full-stack capabilities across backend and frontend.
• Experience with AI-assisted workflows.
• Strong understanding of data consistency and system reliability.
• Fluency in Spanish and English.

Responsibilities

• Own features end-to-end from design to UI and observability.
• Design for resilience at scale and high-volume traffic.
• Evolve distributed architectures toward event-driven patterns.
• Maintain high accuracy in benefits and payments with automated testing.
• Monitor service health with observability tools.
• Mentor junior engineers and standardize engineering approaches.
• Leverage AI tools daily to accelerate development.

Skills

5+ years experience

Full-stack engineering

AI tooling

Spanish fluency

English fluency

Tools

MongoDB

Redis

PostgreSQL

Docker

Kubernetes

GitHub Copilot

Job description

Job Description

At Pluxee, we shape the world of employee benefits and engagement by bringing to life a personalized and sustainable employee experience, at work and beyond. Permanent Regular Job Description: At Pluxee, we shape the world of employee benefits and engagement by bringing to life a personalized and sustainable employee experience, at work and beyond. Join Cobee by Pluxee as a 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. Your next challenge Join Cobee by Pluxee as a 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.

Domain Context

The domain you'll join depends on which squad you're assigned to.

• Benefits — Own the domain that defines what benefits an employee can access, under what conditions, with what limits, and in what markets. 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.
• Payments — Build the engine that moves money globally. A high-performance team dedicated to resilient, mission-critical systems where transactional precision, idempotency, and fault tolerance are at the heart of everything. Involves evolving distributed, event-driven architectures at high transaction volume.
• 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). The domain shares boundaries with Payments (owning employee-specific card logic and mobile flows) and Benefits (storing accumulation activation decisions while Benefits executes the end-of-cycle operations).
• Managers App Owns the HR admin experience, the tools client-company administrators use to manage their organization on the platform, and the client companies entity itself, the core record that everything else in the system hangs off of. Spans self-onboarding flows, multi-region and multi-market rollout, and the operational reliability of the admin-facing product. A domain where company-level configuration, data integrity, and cross-region consistency matter as much as UX.

Key Responsibilities

• 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.
• Design for Resilience at Scale: 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.
• Evolve Distributed Architectures: Understand the complexities of existing systems and evolve them into scalable, event-driven architectures to meet future global product requirements.
• Mission-Critical Precision: When dealing with benefits and money movements, accuracy is essential. You will champion comprehensive automated testing (unit, integration, and e2e) and run advanced load and performance simulations to guarantee rock-solid stability.
• Operational Excellence & Observability: Monitor service health in production, using observability tools to proactively identify and resolve bottlenecks or anomalies.
• Technical Leadership: Share your expertise through deep code reviews, mentoring junior engineers, and documenting engineering standards that elevate the entire squad.
• AI-Driven Execution: 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.

Our Technical Stack

• Stack: 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).
• Observability: Sentry and Datadog/New Relic for real-time monitoring and PostHog.
• AI & Productivity: GitHub Copilot, Claude, ChatGPT, and other GenAI assistants.
• Collaboration: GitHub, GitLab, Teams, JIRA, Confluence.

You are a match

• 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.
• Distributed Systems Mastery: 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.
• Distributed Systems Mastery: Deep understanding of race conditions, eventual consistency, idempotency, and message brokers is a must.
• AI-Empowered Developer: A strong inclination to lean on AI tools for problem-solving, code generation, and workflow optimization, always looking for ways to work smarter and improve team efficiency.
• Problem-Solving DNA: A systematic approach to troubleshooting complex issues in high-concurrency environments.
• Quality First: Extensive experience with automated testing patterns and a \"shift-left\" security mindset.
• Growth Mindset: A passion for continuous learning, open to feedback, and a drive to help others improve their craft.
• Spanish & English fluent.

Why join Pluxee?

Join an inclusive team: work at the heart of the community alongside 5,000 experts across 29 countries - we embrace diversity and value uniqueness, fostering a workplace where everyone can thrive. 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. Grow with us: get support you need to take meaningful steps in your career, whether you're performing your work/life balance or learning new skills.

Join an inclusive team Work at the heart of the community alongside 5,000 experts across 29 countries - we embrace diversity and value uniqueness, fostering a workplace where everyone can thrive. 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. Grow with us Get support you need to take meaningful steps in your career, whether you're performing your work/life balance or learning new skills.