Lead Full Stack Software Developer at Well-funded fintech AI startup

Jack & Jill/External ATS; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A well-funded fintech startup is seeking a Lead Full Stack Software Developer to spearhead the technical evolution of an AI-driven financial platform. In this role, you will design and implement scalable architectures and lead core product development, ensuring high performance. You will mentor junior developers and help establish best practices. The ideal candidate should have proven experience in fintech or SaaS, along with expertise in modern JavaScript frameworks.

Qualifications

• Proven experience in fintech or SaaS sectors.
• Strong interest in AI integration is a plus.

Responsibilities

• Design scalable full-stack architectures using modern web frameworks.
• Lead the development of core product features.
• Mentor junior developers and establish best practices.

Skills

Building and scaling complex web applications

Deep expertise in modern JavaScript frameworks

System design

Integrating LLMs and machine learning models

Job 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.

Lead Full Stack Software Developer

Company Description: Well-funded fintech AI startup

Job Description: As the Lead Full Stack Developer, you will spearhead the technical evolution of a cutting-edge AI-driven financial platform. You will bridge the gap between complex data processing and intuitive user experiences, making critical architectural decisions that define the product's future. This role offers the unique opportunity to shape a high-impact tool from its early stages.

Location: London, UK

Why this role is remarkable:

• Take ownership of a greenfield project at the intersection of generative AI and financial technology
• Join a high-velocity team backed by top-tier VCs with significant runway and market traction
• Influence the company culture and technical roadmap as one of the early engineering leaders

What you will do:

• Design and implement scalable full-stack architectures using modern web frameworks and AI integrations
• Lead the development of core product features, ensuring high performance and security for financial data
• Mentor junior developers and establish best practices for code quality, testing, and deployment

The ideal candidate:

• Proven experience building and scaling complex web applications within the fintech or SaaS sectors
• Deep expertise in modern JavaScript frameworks and backend languages, with a focus on system design
• Strong interest or experience in integrating LLMs and machine learning models into production environments

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

1. Visit our website
2. Click 'Talk to Jack'
3. Talk to Jack so he can understand your experience and ambitions
4. Jack will make sure Jill (the AI agent working for the company) considers you for this role
5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction
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.