Senior Software Engineer (£85k-£115k + Equity) at Fast-growing London finte at Jack & Jill/External ATS

London, England, United Kingdom -

Full Time

Start Date

Immediate

Expiry Date

05 Jun, 26

Salary

115000.0

Posted On

07 Mar, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

System Architecture, Real-time Data Streaming, Trade Execution, Scalable Systems, Backend Services, Java, Python, Go, Distributed Systems, On-call Support, Software Development, Mentoring

Industry

Staffing and Recruiting

Description

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title: Senior Software Engineer Salary: £85,000 - £115,000 + Equity Company Description: Fast-growing London fintech Job Description: Join a high-performance engineering team as a founding-level hire building high-throughput financial infrastructure. You will architect scalable systems for real-time data streaming and trade execution, working directly with a veteran leadership team. This role offers significant technical ownership as you scale critical backend services to support a rapidly expanding user base in the UK market. Location: London, UK Why this role is remarkable: Significant technical ownership over architecture and greenfield infrastructure projects for a high-volume platform. Backed by top-tier VCs and a record-breaking community funding round, ensuring strong market validation. Direct collaboration with an experienced founding team consisting of former tier-one banking and successful fintech scale-up leaders. What you will do: Design and maintain robust, scalable systems for critical financial services using a modern, multi-language stack. Build high-performance connectivity and event-driven architectures to handle thousands of concurrent traders and real-time data. Mentor other engineers and foster a high-standard engineering culture through pragmatic software development and feedback. The ideal candidate: At least six years of commercial experience building and maintaining high-volume, critical backend systems. Strong proficiency in languages such as Java, Python, or Go, with deep knowledge of distributed systems. Proven ability to work in a fast-paced startup environment and a commitment to on-call support for production reliability. Who are Jack & Jill? 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. 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. Next steps Step 1. Visit our website. Step 2. Click 'Talk to Jack'. Step 3. Talk to Jack so he can understand your experience and ambitions. Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. Step 6. If not, Jack will find you excellent alternatives. All for free. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.

Responsibilities

The role involves designing and maintaining robust, scalable systems for critical financial services using a modern, multi-language stack, while also building high-performance connectivity and event-driven architectures.