As the most senior backend engineer, you will architect and build the scalable services powering Felicity, an AI assistant automating 80–90% of property management workflows. You will design event-driven systems in Node.js/TypeScript, integrate advanced LLMs, and establish the technical standards for a high-performing engineering team in a fast-scaling startup environment.
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London, UKNot Disclosed + Equity
Featured roleLondon, UKNot Disclosed + Equity
Lead Backend Engineer at LightWork AI
Join LightWork AI as their Lead Backend Engineer and help build the intelligent operating system for property management. Founded by veterans from Revolut and ESG Book, this VC-backed startup is automating up to 90% of manual property workflows through their AI assistant, Felicity. As the most senior backend hire, you will own the Node.js/TypeScript architecture, integrate cutting-edge LLMs, and shape the engineering culture from the ground up. If you are a senior engineer with 7+ years of experience looking for genuine ownership and early-stage equity in a high-growth London AI company, this is the career-defining role you have been waiting for.
Overview
Why this role stands out
Company
AI25
LightWork AI - VC-backed startup building the AI operating system for property management.
Responsibilities
What you will do
- Architect and build scalable backend systems and RESTful APIs using Node.js, TypeScript, and PostgreSQL.
- Design and maintain microservice and event-driven architectures that support real-time operational workflows and AI integrations.
- Lead technical strategy, mentor engineers, and conduct code reviews to ensure production-grade reliability and performance.
Candidate profile
Who this is a fit for
- 7+ years of professional backend experience with deep expertise in Node.js and TypeScript ecosystems.
- Proven track record of designing and operating production systems in microservice or event-driven architectures.
- Strong leadership ability with experience mentoring engineers and translating complex business requirements into robust technical solutions.
What makes it remarkable
Why this role is remarkable
- Join as the most senior backend authority working directly with a founding team from Revolut, ESG Book, and Mimica.
- Shape the technical backbone of a platform disrupting a massive industry where 75% of time is currently wasted on manual admin.
- Lead the transition from pilot phase to scale, owning the architecture and engineering culture of a potential AI unicorn.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack