Senior Software Engineer (Developer Platform) Engineering · · in London

About bunny.net Some people accept the internet as it is. We see what it could be. At bunny.net, we don’t wait for change. We make it happen. You won’t find layers of red tape or play-it-safe thinking here. You’ll find people who move quickly, take ownership, and push ideas all the way to the edge. Literally. You’ll build things that solve actual problems, not add to them. We’re not perfect, and we don’t pretend to be. But we’re always improving. We’re looking for people who want to do the same, who take pride in their work, and aren’t afraid to challenge what’s possible. Because everyone deserves a better internet. And we’re here to help it hop faster.

We're building the foundational layer that connects Magic Containers, Edge Scripting, and Database into one seamless developer experience, and this role sits right at the center of it. You’ll design and own the projects, secrets management, and observability platform that developers interact with every day. This is greenfield work: the APIs you build here will shape how customers build and scale on bunny.net for years to come. You’ll work alongside a small, highly autonomous Core API team that ships fast, debates ideas openly, and cares deeply about developer experience. If you love building infrastructure that developers love using, you’ll feel right at home.

What will you do?

• Design and implement the project layer connecting resources across Magic Containers, Edge Scripting, and Bunny Database
• Build dev/staging/prod environment management so customers can ship with confidence
• Architect secrets management APIs, think secure storage, sharing, and access patterns across products
• Build observability features - unified logs and metrics - that let customers diagnose problems across multiple bunny services through a simple and powerful UX
• Create fine-grained API key and permission systems with strong multi-tenant isolation
• Design APIs that are intuitive, consistent, and genuinely enjoyable to work with
• Shape architectural decisions and contribute to engineering standards across the Core API team

What will you bring?

• Strong C# / .NET backend experience, including async, memory management, and concurrency
• A sharp sense of API design from the developer's perspective: naming, consistency, error handling
• Experience building APIs and interfaces used directly by other developers
• Experience building secure, multi-tenant backend systems
• Solid understanding of secrets management and credential security principles
• Proficiency with RabbitMQ (or similar) for background processing and queuing
• Hands‑on experience with MariaDB (or similar relational databases)
• Familiarity with CI/CD via GitHub Actions and monitoring with Grafana
• A rigorous testing mindset: integration tests, quality gates, and edge cases
• Proficiency using AI coding tools (Claude Code, Codex, Cursor) as a daily workflow multiplier
• Full ownership mentality: from design through to production
• Good judgment on when to go deep alone and when to bring others in
• Ability to work independently in an async, fast‑moving environment
• Clear communication: in code, in reviews, and in Slack

What will make us extra happy?

• Experience building developer platforms, PaaS products, or internal tooling
• Experience designing API key and permission systems at scale
• Experience building logging, observability, or tracing products
• Redis knowledge for caching and performance
• Startup or scale‑up experience with high ownership and autonomy

Where should you be located?

This job is fully remote from Europe (ideally CET ± 3 hours). You’re still free to hop around the world and switch up your scenery whenever you want.

What's in it for you?

• 100% flexible hours - Your work, your rhythm.
• Remote‑first by design - No offices, no commute, just the freedom to work anywhere. Miss the office? We’ll give you a 3‑night voucher for visiting our headquarters.
• Performance‑based bonuses - Great work pays off, and we reward impact annually.
• Medical, dental, and vision insurance - Coverage worldwide.
• Paid time off - Enjoy 25 vacation days, plus an extra loyalty day each year, capped at 5 years (30 days total), on top of your local public holidays.
• Meeting‑free Thursdays - We keep Thursdays meeting free internally so you can focus on deep work without interruptions.
• Home office budget - An annual budget of €500 to set up your comfortable office.
• Paid sick leave - Take time off to fully recover without financial worries.
• Parental leave - Paid 16 weeks for birthing parents, 8 weeks for non-birthing parents.
• Annual fluffle building - Once a year, we meet in a sunny location.
• Employee Stock Option Plan (ESOP) - Everyone at bunny.net gets a piece of the pie, starting with 0.01% equity.
• Mental health support - Access to mental health resources via BetterHelp.com.
• Wellness budget - An annual well‑being budget of €480.
• Educational budget - €500 yearly for books, seminars, or online courses.
• Music on us - Enjoy a yearly Apple, Spotify, or YouTube Premium subscription.