You will join a high-trust engineering team to build the core infrastructure automating month-end close processes. Working closely with the CPTO, you'll ship features across a Spring Boot and Kotlin stack, solving deep accounting challenges. This role offers significant visibility, requiring a pragmatic approach to testing hypotheses and building scalable, dependable products for global customers.
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Backend Engineer at Mayday
Join Mayday, an award-winning accounting-tech startup that recently passed £1m ARR and is set to double revenue in 2025. As a Backend Engineer, you'll build automation and AI to eliminate the tedious spreadsheet work that haunts finance teams. Working on a modern Spring Boot and Kotlin stack, you will ship directly to production and solve complex accounting challenges alongside experienced founders. With elite backing and a high-trust culture, this London-based role offers the unique chance to be a key player in a category-leading fintech that is rapidly expanding into North American markets.
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Location
London, United Kingdom
Compensation
£75k + Equity
Company
Mayday
Role overview
Software
Mayday is an accounting-tech startup that builds automation and AI tools to eliminate manual spreadsheet-based work for in-house finance teams using Xero or QuickBooks Online. It automates month-end operations including intercompany reconciliations, recharges, journal postings, bank reconciliations, deferred revenue, prepayments, and more, helping teams close faster, reduce errors, and achieve ERP-level control without complexity. Serves mid-market SMBs with 2-10 person finance teams, with products like Balancer, Recharger, BRAG, Mayday HQ.
What you will do
- Develop and scale next-generation accounting technology using Spring Boot, Java/Kotlin, MySQL, and OpenSearch hosted on AWS.
- Collaborate directly with the CPTO to design and implement pragmatic solutions that solve complex, real-world finance automation problems.
- Maintain and improve core product features while occasionally contributing to the React/TypeScript frontend and a Ruby on Rails application.
Who this is a fit for
- You are an experienced engineer with several years of experience working in fast-paced startup environments as a backend specialist.
- You possess a strong, pragmatic problem-solving mindset and are comfortable working independently or collaboratively as tasks require.
- You have deep expertise in the JVM ecosystem (Java or Kotlin) and are eager to master the complexities of mid-market accounting.
Why this role is remarkable
- Join a category-leading startup that recently won Xero’s Global People’s Choice Award and has already surpassed the £1m ARR milestone.
- Work under the leadership of seasoned founders including a former CFO and a CTO with experience at Optimizely and Idio.
- Benefit from a high-trust environment where you ship directly to production and see your impact on finance teams within days.
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.
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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 Mayday wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.