Senior Fullstack Engineer (React)

TL;DR

Senior Fullstack Engineer (React): Designing, building, and evolving core application architecture and shared SDKs for customer-facing pages with an accent on mono-repo scaling, block-based architecture, and developer experience tooling. Focus on refining architectural design, streamlining contributions, and coaching product-team engineers on best practices.

Location: Hybrid working model (60% office, 40% home) in Madrid, Spain. Option to work 20 days abroad in approved countries.

Company

hirify.global is an e-commerce trailblazer in the pet industry, focusing on making over 12 million customers happier with continually adapting solutions.

What you will do

• Design, build, and evolve the core Next.js application shell, routing, rendering engine, and shared SDKs used by all frontend teams.
• Contribute to mono-repo workflow improvements, implement guidelines, review cross-package PRs, and automate releases.
• Partner with architects and designers to refine the block-based architecture, design system, scalability strategy, and governance model.
• Coach product-team engineers on best practices in performance, testing, and code quality; advocate for standardisation.
• Lead automation efforts by identifying bottlenecks and implementing automations.
• Contribute across the full delivery life-cycle – discovery, PoCs, code, reviews, infra, and post-mortems.

Requirements

• 5+ years of professional development experience with TypeScript, React, and Node.js (or similar).
• Deep understanding of modern CI/CD, test automation, and cloud-native deployments (Docker, Kubernetes, AWS).
• Strong architectural skills: modular design, scalability, performance, and API contract definition.
• Hands-on experience with production systems in distributed environments.
• Comfortable in cross-team discussions, implementing standards, and mentoring engineers.
• Excellent verbal and written English.

Nice to have

• Experience building developer-platform products or internal frameworks.
• Experience maintaining a large-scale mono-repository (Nx, Bazel, Turborepo or similar) and design system libraries.
• Knowledge of experimentation/personalisation tooling (Optimizely, audience targeting).
• Familiarity with e-commerce performance KPIs (LCP, bounce-rate, conversion).
• Exposure to server components, edge rendering, and advanced caching strategies.
• Infra-as-code (Terraform/CDK) and AWS.
• Participation in open-source or inner-source communities.

Culture & Benefits

• Work in an incredible, multinational team with a collaborative culture including pair-programming and design docs.
• Hybrid working model (up to 40% home office per month) and an option to work for 20 days abroad in approved countries.
• Development opportunities to shape your career path, excellent training and support, and wellbeing offers.
• Subsidised transport or bike leasing.
• 20% discount across all hirify.global products.
• 28 Annual Vacation Days and Private Medical Health Insurance.