Senior Backend Developer

# Senior Backend Developer ## About the Role Basic-Fit is seeking a Senior Backend Developer to build and evolve software that supports millions of members across Europe. Technology is central to Basic-Fit's operations, powering 24/7 club experiences as well as member-facing capabilities such as membership management and workout tracking. In this role, you will build and maintain high-scale APIs, define and improve Service Level Objectives (SLOs), support complex technical challenges, and contribute to architectural and engineering roadmap decisions. You will also help shape the adoption of AI in the development process while taking ownership of security, privacy, performance, and other non-functional engineering concerns. ## Key Responsibilities * Build and maintain APIs capable of handling millions of requests reliably. * Define Service Level Objectives (SLOs) for APIs and platform systems. * Drive structural engineering improvements to achieve defined reliability and performance objectives. * Support engineering teams through technical documentation and architectural design. * Investigate and resolve complex software issues and bugs. * Contribute to the long-term engineering roadmap and strategic investment decisions. * Co-own non-functional engineering areas including security, privacy, and performance. * Help shape and adopt AI tooling within the software development process. * Share technical knowledge and best practices with engineering teams. * Take ownership of technical risks and drive appropriate solutions. * Contribute to a fast-moving engineering environment with minimal unnecessary process. ## Required Qualifications * Demonstrated professional experience with at least part of the listed technology stack. * Ability to share technical knowledge and collaborate effectively with engineering teams. * Understanding of technical risk management and willingness to take ownership. * Ability to work effectively in a fast-moving environment. * Curiosity and enthusiasm for exploring AI tooling in software development. * Eligibility to work in the Netherlands. * New work visa sponsorship is not available; existing sponsorships may be transferable. ## Preferred Qualifications * Experience across a broader portion of Basic-Fit's backend and platform technology stack. * Experience building and operating high-scale APIs. * Experience defining or working toward Service Level Objectives. * Experience with architectural design and complex production troubleshooting. * Experience with security, privacy, and application performance topics. * Experience using AI-assisted development tools. ## Skills & Competencies * Backend Development * API Development * Scalable Software Systems * Service Level Objectives (SLOs) * Software Architecture * Technical Documentation * Production Troubleshooting * Risk Management * Security * Privacy * Performance Optimization * AI-Assisted Development * Technical Leadership * Knowledge Sharing * Strategic Engineering * Problem-Solving * Ownership * Collaboration ## Technology Stack * React * TypeScript * Tailwind * Storybook * Service Workers * Next.js * Playwright * Nest.js * Prisma * Postgres * Redis * Azure EventGrid * Azure Service Bus * Heroku * Azure DevOps * New Relic * Akamai * GitHub Copilot ## Education & Experience ### Experience * Demonstrated experience with at least part of the listed technology stack. * Experience working as a software engineer in a fast-moving technical environment. * Experience with backend development and scalable APIs is central to the role. ### Education * No specific degree or educational requirement is stated in the source description. ## Work Arrangement & Schedule * **Employment Type:** Not specified in the source description. * **Work Arrangement:** Hybrid * **Office Schedule:** 4 days per week in the office and 1 day per week from home. * **Location:** Netherlands * **Office:** Plan-T building, next to Tilburg Central Station. * **Work Authorization:** Must be eligible to work in the Netherlands. * **Visa Sponsorship:** Basic-Fit does not sponsor new work visas; existing sponsorships may be transferable. ## Compensation & Benefits * Compensation is not specified in the source description. * Unlimited access to GoodHabitz and LinkedIn Learning. * Professional and personal development opportunities. * Dedicated Talent Coach. * Informal, international, and collaborative work culture. * Internal hackathons. * Travel allowance. * Bike plan. * Health insurance discounts. * Remote work allowance. * Pension plan with 52% contribution by Basic-Fit. * Free Basic-Fit gym membership. * Access to the gym at the Basic-Fit headquarters in Hoofddorp. ## Compliance / Additional Information * **Employer:** Basic-Fit * Basic-Fit states that its technology supports 24/7 club operations and member-facing digital services across Europe. * The role involves contributing to engineering standards, strategic roadmap decisions, and AI adoption within development processes.