You will lead the architectural design of a core AI-native platform, building high-scale agent-driven workflows to transform the accounting industry. Reporting to the Principal Engineer with direct CEO exposure, you will manage production-grade microservices and mentor a growing engineering team while bridging the gap between complex AI prototypes and reliable financial systems.
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Senior Engineer at Adsum Technologies
Adsum Technologies Ltd is building the 'Harvey AI for accountants,' and they are looking for a Senior Engineer to lead their AI-native platform architecture. With 1,000+ customers already onboard and backing from elite investors like Episode 1, this role offers a unique chance to build production-grade AI-agent workflows at scale. You will enjoy a £150k base salary, up to 0.6% equity, and a direct line to the CEO, all while working from a vibrant Victoria-based office in London with visa sponsorship available.
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Location
London, United Kingdom
Compensation
£150k + Equity
Company
Adsum Technologies Ltd
Role overview
Finance
Adsum builds modern, AI-enabled tax technology and tailored financial products for businesses, accountants and finance professionals. The company specializes in tax management automation through its flagship product, OpenTax, which streamlines VAT refunds, R&D Tax Credits, and Creative Industry Tax Credits. OpenTax is designed to automate the entire tax process, providing speed, efficiency, and accuracy, and enables businesses to receive instant VAT refunds and tax credits within 60 minutes of submitting returns to HMRC. The platform features HMRC data synchronization, deadline tracking, automated reminders, team collaboration tools, multi-agent account consolidation, real-time dashboards, and secure data-sharing capabilities.
What you will do
- Lead the design and implementation of AI-native architecture using Python (FastAPI/Django) and AWS services like Lambda, SQS, and EKS.
- Translate complex AI prototypes into secure, highly-available production microservices, owning the entire lifecycle from deployment to real-time inference.
- Mentor a team of 4-6 software engineers, establishing cultures of technical excellence, CI/CD, TDD, and rigorous observability using Prometheus and Grafana.
Who this is a fit for
- 8-15 years of full-stack experience in fast-scaling environments or category leaders like Revolut, with a focus on platform architecture and data infrastructure.
- Proven expertise in building and scaling AI-agent driven workflows and managing the unique challenges of non-deterministic, data-driven systems.
- Strong product delivery mindset with the ability to navigate complex compliance environments (ISO) while maintaining a rapid iteration cycle.
Why this role is remarkable
- Significant equity upside (0.3% - 0.6%) in a high-growth startup backed by leading investors like Episode 1 and Digital Horizon.
- Rare opportunity to shape the "Harvey AI for accountants," building non-deterministic systems for a platform already serving 1,000+ customers.
- Direct influence on technical and product strategy through a high-visibility reporting line to the Principal Engineer and CEO.
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.
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.
Meet Jack
What happens next?
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 your profile’s a match and Adsum Technologies Ltd wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.