As the highest-level individual contributor, you will architect AI-powered tools transforming legal document review for elite firms like Barclays and A&O Shearman. You will drive end-to-end technical decisions across a Python, TypeScript, and .NET stack, scaling high-throughput data pipelines and mentoring a high-performing engineering team in a hands-on capacity.
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Learn about Jack
Staff Software Engineer at Definely
In this premier IC role, you will architect the next generation of AI-powered document review tools used by global giants like Barclays and Slaughter and May. With a package including up to £130k base, performance bonuses, and equity, you'll have the autonomy to shape technical strategy across a modern full-stack environment. If you are a hands-on leader passionate about building scalable distributed systems and mentoring world-class talent in London, this is your chance to define the 'Review' layer of legal work.
About this role
Role overview
About the company
Definely
Definely is an AI-powered LegalTech company that provides a suite of tools to help corporate and private practice lawyers draft, review, and manage complex contracts more efficiently, primarily within Microsoft Word. Its products streamline the creation, editing, and quality-checking of legal documents by keeping lawyers in their natural workflow while enabling fast navigation across definitions, references, and clauses. Originally designed to make legal documents more accessible for visually impaired professionals, Definely has evolved into a broader drafting, reviewing, and knowledge platform used by in-house legal teams and law firms globally. The product suite includes features such as contextual editing, clause insertion and reuse via a knowledge repository (Vault), and AI-assisted drafting and review (Enhance and Draft). Definely aims to reduce review time, standardize document quality, mitigate legal and operational risk, and simplify how legal teams understand and work with complex information. The company is a fast-growing, Series B–stage scale-up headquartered in the UK and focuses on transforming the global legal services market through AI-driven document workflows.
What you'll do
What you will do
- Architect and build scalable full-stack systems, from React-based frontends to complex backend data pipelines for document processing.
- Lead technical design discussions and build consensus on architectural patterns to ensure reliability across distributed services.
- Write and ship production code daily, maintaining a high bar for engineering excellence through rigorous code reviews and mentorship.
Who you are
Who this is a fit for
- Deep full-stack expertise with architectural opinions on React frontend and backend systems using Python, TypeScript, or C#/.NET.
- Proven track record of technical leadership as a Senior or Staff IC, ideally within document-heavy domains or AI-powered products.
- Strong fundamentals in distributed systems and high-throughput data processing, with the ability to proactively address technical debt and scalability risks.
Why this role
Why this role is remarkable
- Impact a category-defining product backed by heavyweights like Microsoft and Google, currently used by the world's most prestigious law firms.
- Rare opportunity to lead as a Staff IC, shaping architectural direction and technical culture without the requirements of people management.
- Join a high-growth Series B environment offering significant equity, hybrid flexibility, and a generous £750 annual learning and development budget.
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.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
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.