Backend Engineer (XML Lead)

Salary DKK 35,000 - DKK 45,000
Equity To be negotiated

About Devin

Devin is building the first real DevOps platform for Claris FileMaker, a longstanding Apple-associated ecosystem used across 70,000+ companies. Because FileMaker stores entire applications inside a proprietary binary file format (.fmp12), no proper version control has ever existed.

We’re changing that.

Our engineering team is developing the deeply technical infrastructure needed to extract, structure, compare, and interpret the hidden XML catalogs inside these files—making real version control, automation, and collaboration possible for the first time.

You don’t need any FileMaker experience. This work is about parsing, modeling, interpreting, and comparing complex nested XML structures and creating the logic that powers Git-like workflows for a platform that has never had them.

We are a funded startup in our Go-to-Market phase with real customers, strong inbound demand, and a close engineering relationship with Claris (Apple). Joining Devin means working directly inside a niche Apple ecosystem with opportunities to participate in technical conversations with Claris Engineering leadership.

We’re a small, ambitious team where everyone plays a defining role. You’ll be joining a founder-led environment with high ownership, fast iteration, and a tight-knit culture. Startup life means high autonomy, big responsibility, and the occasional late night — balanced by an energized, social environment with Friday bars, team events, conference trips in the EU and US, as well as occasional visits and meetings with Apple executives at Apple campuses in Texas and Sillicon Valley.

If you want to help shape the future of DevOps inside an Apple ecosystem — and become one of the first engineers defining our long-term architecture, culture, and standards — this is the place for you.


The Role

As our XML Component Engineer, you will contribute to core modules responsible for:

  • Parsing and analyzing the full set of XML catalogs embedded within proprietary application files

  • Modeling and navigating deeply nested hierarchical data structures

  • Detecting structural, attribute-level, and semantic changes across versions

  • Designing fast, accurate comparison and change-detection logic

  • Building foundational components used by our new agent-based architecture as well as Claris APIs and CLIs

  • Improving performance and enabling near-real-time diff responses

  • Collaborating closely with our founder to explore new approaches for interpreting undocumented formats


This is foundational work: the systems you build will become the basis for version control, collaboration, and automation across thousands of enterprise environments.


Who You Are

  • You enjoy parsing problems, compilers, interpreters, or tree-structured data

  • You have experience in Rust or Python (Rust preferred, but Python is fully acceptable)

  • You think deeply about precision, correctness, and performance — especially in complex data models

  • You enjoy reverse-engineering, structural analysis, or algorithm design

  • You’re excited by the challenge of building foundational technology that could integrate directly into an Apple ecosystem

  • You thrive in small, high-trust teams where your contributions matter every day

  • You want to grow fast, take ownership, and build real technology — not just deliver tickets

  • You’re energized by startup momentum: tight collaboration, fast problem-solving, and sometimes pushing late to ship something exceptional

  • You value a social team culture: Friday bars, team activities, spontaneous celebrations

  • You’re comfortable working on-site, collaborating closely with teammates, and building a strong team vibe

  • You enjoy working on macOS and like being in (or are curious about) the Apple developer world

  • You’re motivated by being one of the first 3–4 engineers shaping a highly ambitious product


What We Offer

  • True ownership of a core engineering area

  • Modern office with best-in-class hardware

  • Competitive salary & influence from day one

  • Conferences trips in Europe & the US

  • Occasional meetings at Apple campuses in Texas and Sillicon Valley

  • A meaningful role in building category-defining tech

  • A chance to become one of the foundational engineers

For more information or questions please contact us at david@devin.fm

Perks and benefits

This job comes with several perks and benefits

Near public transit
Near public transit

Free office snacks
Free office snacks

Pension plan
Pension plan

Social gatherings
Social gatherings

Equity package
Equity package

New tech gear
New tech gear

See all 15 benefits

Working at
Devin

At Devin ApS we're building the first real DevOps platform for Claris FileMaker, Apple’s long-running low-code ecosystem used inside thousands of enterprises—including Apple itself, Coca-Cola, Samsung, the US Navy, banks, airports, hospitals, and countless internal teams that need custom workflows. And yes: FileMaker is a bit of a strange, legacy-feeling technology from a modern engineering point of view. It stores entire applications—schema, logic, UI, permissions—inside a proprietary binary file format that cannot be versioned or inspected. No Git. No diffs. No real CI/CD. Most teams still build features directly in production because they simply have no choice. That’s exactly why Devin exists. We’re taking a platform with huge real-world usage but decades of technical debt, and building the tooling it has never had: true version control, merge, diff, test automation, safe deployments, and server-side orchestration. Not by patching workflows around the edges, but by breaking open the internal structure of the .fmp12 format and building the equivalent of Git, GitHub Actions, and Release Management for a low-code ecosystem that has been stuck in 2005. Our work includes: • Building a high-performance XML analysis layer capable of reading and comparing the hidden catalogs inside .fmp12 files • Generating and applying patch files through Claris’ CLI to achieve true merge and conflict resolution • Designing a distributed backend (Devin Server 2.0) that runs on-prem and cloud, powering version control, test automation, deployments, and data migrations • Creating a modern DevOps workflow on top of a platform that was never designed for one This is deeply technical, state-of-the-art work involving parsing, schema design, distributed systems, performance engineering, and creating entirely new abstractions that will become the standard for 25,000+ FileMaker developers worldwide. You do not need any FileMaker experience—zero, genuinely. Think of FileMaker as a domain with a massive impact footprint but almost no modern tooling. Our founder, David, is one of the world’s leading experts on the platform and maintains close relationships with Claris’ engineering leadership. You will work in a modern stack, while he covers everything domain-specific. We’ve proven commercial demand with Devin 1.0, secured angel funding, and are now expanding the team to build the breakthrough technologies behind Devin 2.0. You’ll join as part of the early technical core: a small, ambitious team working on hard engineering problems with real user impact, strong support from Claris, and direct visibility inside a niche Apple ecosystem. It’s a rare chance to build something genuinely new—almost “Git for a platform that never had Git”—and define a category in a space that is both weird and surprisingly important. We’re soon moving into a new modern office space — therefore no office photos yet 😊

Read more about Devin

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