Be-IT
Senior Back End Developer
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A system that has run for over twenty years still underpins core production across dozens of sites worldwide. It's now at end of life, and replacing it is a funded, multi-year programme. You'd own the back-end architecture for the new one.
This is business-critical in the literal sense: when the current system goes down, production stops. So the standards you set are load-bearing from week one, and the work shows up where the business actually feels it.
It's greenfield in the languages that matter (Kotlin, Spring Boot, PostgreSQL, an event-driven core). The harder problem is the knowledge itself. Two decades of hard-won operational logic sits in the heads of a few domain experts and inside a legacy database nobody wants to touch. A large part of the job is building the migration that lifts that knowledge into a clean, event-driven codebase, one area at a time, without dropping a single transaction in a business that never pauses.
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A few things that matter:
- You've led back-end architecture on Kotlin or Java, because the domain-driven and event-driven patterns the rest of the team builds on will be yours to set from the start.
- You've run an incremental migration of a live system before, or the problem genuinely pulls at you, so keeping old and new in step without data loss is the part you're here for.
- You're comfortable working with non-engineers, because the people who hold the domain knowledge aren't developers, and pairing with them is how it gets captured.
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Remote, with roughly 1-2 days a month on-site in Scotland. Outside IR35, 12+ month project.
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