L
LemFi
Senior Software Engineer (Foundations)
Skills
AICRM
17 days ago
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Important information
Contract type:
Permanent
Location:
London, UK
Work mode:
Onsite
Published on:
3 October 2026
What they need
- LemFi’s Foundations tribe is the platform backbone every product team relies on. We own onboarding and identity (KYC end-to-end), engagement systems (rewards, CRM tooling, LFI cache), and the internal SDKs and architectural standards that let other squads move fast without reinventing the wheel. If it touches how a customer gets onto the platform or how teams build reliably on top of it, it runs through us
- We are looking for a Senior Backend Engineer who is at home in Go, cares deeply about building things that last, and has the ownership instinct to drive a system from design to production with minimal hand-holding
- You will be a key technical voice in the tribe - setting standards, shipping real product, and enabling the rest of engineering to move faster because of the work you do
- Own and evolve our core identity and onboarding services - KYC flows, verification orchestration and the data contracts that downstream systems depend on
- Build and maintain internal SDKs and shared libraries that abstract platform concerns (auth, identity, caching, eventing) so product teams can move without friction
- Define and champion cross-platform architectural standards, making opinionated decisions about service design, API contracts and data consistency that the wider engineering org follows
- Drive engagement platform capabilities - rewards logic, CRM integrations and LFI cache - from spec to production, using AI-assisted development tooling to compress iteration cycles without sacrificing correctness
- Partner closely with platform and infrastructure teams to raise the reliability and observability bar across Foundations-owned services
- Tackle the hard, ambiguous problems - new country launches, regulatory identity requirements, scaling events - and turn them into clean, well-documented solutions
- Contribute to a high-ownership engineering culture: code reviews, architectural reviews, incident response and mentoring are part of the job, not extras- A track record of building and scaling distributed systems - you have seen things break at scale and know how to design so they do not
- Strong opinions about system design, API contracts and service boundaries, backed by real examples you can walk us through
- Comfortable with the full lifecycle - design, build, operate, improve - with evidence of genuine end-to-end ownership rather than handing off to other teams
- Practical, demonstrable use of AI development tools in your daily engineering workflow; you validate AI output rather than blindly accepting it
- Experience working on or closely with platform or enablement teams: shared libraries, internal tooling, developer experience or API gateways
- At least five years of backend engineering experience with Go as your primary language in a production environment
- Exposure to fintech, payments or identity/KYC systems
- Experience building SDKs or developer-facing platform services consumed by other engineering teams
- Prior work in a high-growth startup or scale-up (roughly 50-500 people) where you had to set standards, not just follow them
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