Senior Product Engineer

Pluxee; España; On-site; EUR 70,000 - 95,000; Full time

Job summary

Pluxee is seeking a Senior Product Engineer to own features end-to-end across backend, frontend, and AI-assisted workflows within one of our core domains. You will work on multi-region platforms, ensuring transactional integrity and scalable architectures in a fast-paced environment.

The role emphasizes technical leadership, automated testing, and close collaboration with cross-functional squads to deliver high-impact product experiences for Cobee by Pluxee.

Qualifications

• 5+ years of experience building production-grade applications, full-stack or across layers.
• Experience with TypeScript ecosystem is a plus.
• Strong understanding of distributed systems concepts like eventual consistency and idempotency.

Responsibilities

• Own features end-to-end from domain design through backend services to the UI and observability.
• Design for resilience at scale and ensure data consistency and reliability as product requirements grow.
• Evolve distributed architectures to scalable, event-driven systems for global needs.
• Champion comprehensive automated testing and run load/ performance simulations for stability.
• Provide technical leadership through code reviews, mentoring, and engineering standards.
• Leverage AI tools daily to accelerate development and optimize team delivery.

Skills

Full-stack development

Distributed systems

AI tooling

Code reviews

Mentoring

Tools

Node.js

React

TypeScript

NestJS

MongoDB

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.

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.

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

Benefits

— 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

—engine that moves money globally. 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

— 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 - o

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.

• 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
• 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.)
• 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.
• 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. Comfort working across backend and frontend, using AI tooling to close gaps in unfamiliar territory.
• 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.

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.