Back-End Developer (.NET), Oostzaan

Back-End Developer (.NET) (32–40 hours) Location: Oostzaan (hybrid, 3/5 days on-site) Contract: 32–40 hours Language: English (Dutch is a plus)

BONO is growing fast. Our goal is to become Europe’s one-stop shop for supplements: all brands, all goals, in one place. We take a tech-first approach. Most of our systems are built in-house, and our founding team has a strong technical background. We believe in automating everything that can be automated. This helps us stay lean and efficient while competing with much larger players. It’s something we actively challenge ourselves on every day.We’re a young and energetic team with an average age of 23. We work hard, but we also keep things fun. Building something ambitious only works if the energy stays good. Every day, thousands of customers across Europe use our platform. Our next goal is scaling BONO to €100 million in revenue. Tosupport our next phase of growth, we’re looking for a

back-end developer

who enjoys building reliable, scalable systems that power real products used every day. You’ll work on real products used every day, together with a small and motivated team that values quality, ownership, and collaboration. Note:

This role is only open to candidates who are currently based in the Netherlands and already have full authorization to work here. We’re unable to sponsor visas or offer relocation support. This position is for employees only and is not open to freelancers or self-employed contractors. Please note that unsolicited recruitment outreach is not appreciated.

What you’ll do Maintain, improve, and extend our backend platform built on

.NET Design and implement new backend features that support business needs and accelerate growth Work with Shopify APIs and other third-party integrations to optimize e-commerce workflows (inventory, orders, fulfillment, payments) Ensure scalability, performance, and reliability using PostgreSQL and Google Cloud PlatformCollaborate with front-end developers to deliver clean, well-documented APIs Introduce automation and AI-driven solutions to make internal operations smarter and more efficient Help keep the codebase healthy through testing, code reviews, and CI/CD improvements

What you bring Proven experience as a software engineer with strong .NET skills Hands-on experience with REST and/or GraphQL APIs and system integrations Solid understanding of e-commerce workflows and backend architecture Experience with PostgreSQL and cloud platforms (preferably Google Cloud Platform)Experience with CI/CD pipelines to automate build, test, and deployment workflows A strong problem-solving mindset with the ability to design scalable, efficient solutions Clear communication skills and a collaborative, product-minded approach Willingness to work from our Oostzaan office at least 3 days per week (with flexibility when needed)

Nice to have Experience with e-commerce, such as Shopify (storefront or headless) Familiarity with analytics, experimentation, or SEO basics Experience with automation workflows or AI integrations Exposure to front-end technologies or close collaboration with front-end teams

What you get Salary between

€3.669,47 and €5.747,73

gross per month, depending on experience 23 vacation days (full-time) High-end hardware and a well-arranged setup Fully catered lunch every workday Flexible working hours Work from home two days per week Pension contribution, travel allowance, gym membership reimbursement, and internet allowanceChristmas package, birthday gift, team outings, and regular drinks A young, dynamic team with short lines and real influence on product decisions

If you enjoy building robust backend systems and want your work to have real impact, we’d love to hear from you.