Senior Frontend Engineer

careers at payabl. where money flows, people grow. payabl. gives businesses one platform for online and in-store payments, multi-currency business accounts, cards and 300+ global payment methods. We're a team spread across London, Amsterdam, Frankfurt, Limassol and Vilnius, and we're looking for people who want to grow as fast as we do. ↗ Real impact Your work moves real money for real merchants ↗ Career growth Annual learning budget and industry events ↗ Made to be fun 25 days off, wellness and team workouts Careers at ABC Inc · Product · Remote Senior Individual Contributor · Full-Time · Permanent Senior Front-End Software Engineer React / NextJS / TypeScript MACH Architecture 1B+ Downloads Remote-First We're looking for a Senior Front-End Software Engineer to join our engineering team — helping build the technology behind apps used by 30M+ people every month across Health, Wellness, and Music. The Role This role goes beyond feature delivery. As a Senior Engineer, you'll influence technical direction, raise engineering standards, and help teams make better long-term decisions around performance, quality, and maintainability. You'll act as a technical mentor for our wider front-end community and a key partner to our Design, Product, and Content teams — working on our MACH-based platform (Microservices, API-first, Cloud-Native, Headless), built entirely in-house. Key Responsibilities • Drive front-end architecture decisions – including component design, state management, and application structure across the platform • Lead complex implementations – design and deliver front-end solutions using React, NextJS, and TypeScript at scale • Shape shared design systems – contribute to and influence front-end standards used across our app portfolio • Mentor and elevate engineers – provide technical leadership through code reviews, mentoring, and pairing • Partner cross-functionally – act as senior technical partner to Product, Design, and Content teams from discovery through to delivery • Own critical user journeys – ensure high standards of usability, accessibility, performance, and resilience across our apps • Build and evolve APIs – consume and contribute to GraphQL and REST APIs; contribute to Node.js backend services where required • Champion engineering best practices – code quality, testing strategy, performance optimisation, and security • Stay ahead of the curve – attend conferences, bring new ideas back, and apply front-end trends pragmatically • Identify and resolve risk – proactively surface technical constraints and opportunities across CI/CD, developer experience, and delivery flow Qualifications Essential • Significant commercial experience as a Senior Front-End or Full-Stack Engineer in large-scale production environments • Expert knowledge of JavaScript and TypeScript • Deep experience with React and NextJS (or equivalent modern front-end frameworks) • Strong understanding of web performance, accessibility (WCAG), and responsive design • Experience mentoring junior and mid-level engineers and supporting their technical growth • Strong communication skills and experience collaborating with Design, Product, and Content teams • Experience working across the full software development lifecycle including testing, CI/CD, and automation Desirable • Experience working in MACH / composable architectures • Knowledge of Core Web Vitals and front-end performance monitoring • Familiarity with AWS or GCP and Infrastructure as Code • Event-driven or distributed system exposure • A strong DevOps mindset and comfort working in containerised environments Why Join Us • Work on apps with 1B+ downloads and 30M+ monthly active users worldwide • Play a genuine senior role with real influence over techn