# Senior Back-end Developer at Elockers > Onsite · Netherlands · Senior · Backend · open. Source: https://alderhq.app/jobs/recruitee%3Aelockers%3A2753635 (read 2026-11-11). ## Facts (observed) - Company: [Elockers](https://alderhq.app/companies/elockers) - Location text: Amsterdam, Noord-Holland, Netherlands - Where it can be done from (inferred): Onsite · Netherlands (evidence: "Location: Amsterdam, Noord-Holland, Netherlands") - Posted: 2026-09-21 (51 days ago) - First seen by alder: 2026-11-07 · last verified: 2026-11-07 - Reposted: 0 times · edited: 0 times - Apply on the employer's site: https://elockers.recruitee.com/o/senior-back-end-developer-1 - Skills listed (inferred): JavaScript, Node.js, React Native, Kafka, Distributed systems ## Pay and sponsorship - Posted pay: €60k–€90k per year (from the listing's pay field) - Market band for similar posted roles (Amsterdam, n 5): p25 €73k, median €74k, p75 €75k ## Description (the employer's text) Elockers runs the smart-locker platform that festivals, venues, and events across six countries rely on for real-time payments and marketplace-style payouts, including on-sale moments where a large share of a site's lockers can sell out within a minute. We're live in eleven countries, with further international expansion and two acquisitions underway. Our platform is genuinely strong: microservices architecture (~30 services), event-driven data flow, and a payments stack built for a real marketplace. This isn't a role about fixing something broken. It's about strengthening a platform that already works well, hands-on. ### The Role We're looking for an exceptionally strong, hands-on Senior Back-end Developer to work deep in our microservices platform, where software, payments, and physical hardware come together. You'll match our current technical level and raise it through your own hands-on work. You’ll design, build, and debug complex systems yourself, with real technical depth. ### What you'll work on • Our microservices platform, with Node.js and modern architecture patterns at the core • Cloud-native engineering on DigitalOcean App Platform: deployment, scaling, monitoring, and production reliability • Reliability at peak: real-time payments and traffic spikes during live events, with zero tolerance for downtime • Our Adyen-based payments and marketplace systems, and how our software connects to physical locks and hardware • Engineering discipline: CI/CD, documentation, and AI-assisted development, as we raise an already-strong platform further ### What you'll bring • Deep, hands-on technical seniority. You independently design, build, and debug complex distributed systems • Strong, current Node.js and microservices expertise, a core requirement • Real soft skills and team fit. A clear communicator who works well in a small, fast-moving team • Genuine ownership mentality. You step up when something business-critical is on the line • Cloud/platform engineering experience, ideally DigitalOcean App Platform • Payments or marketplace experience (Adyen, PSPs, split payments, KYC) and comfort with high-peak, mission-critical systems • IoT/hardware integration experience is a genuine plus, our software talks to physical lockers • Nice to have: React Native/Expo experience, multi-country scaling with GDPR awareness, background in events or ticketing ### Our stack today Microservices (~30 services), moving toward Node.js at the core. Adyen for payments. Kafka, ClickHouse, Metabase for data. React Native/Expo for mobile. DigitalOcean, Sentry, New Relic, Jira for infra and tooling. ### What we offer • A gross annual salary of €60,000-€90,000, depending on experience • Real technical depth, working on a platform where software, payments, and hardware genuinely come together ### Sound like you? The most efficient way to apply is to apply here op our website. If you have any questions, feel free to give us a call or e-mail. 0615348554/brendan@elockers.com --- Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/recruitee%3Aelockers%3A2753635 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.