AI-Native Full Stack JavaScript Engineer

Remote | Europe Preferred | Full-time (Freelance/B2B)

About the Company

Our client is a fast-growing fintech company building AI-powered financial research products for investors, hedge funds, and financial professionals worldwide.

With a team of approximately 30 people distributed across the UK, Spain, and Europe, the company operates as a fully remote, output-driven organization focused on building cutting-edge AI solutions on top of large-scale financial datasets.

As the business continues to grow, they are looking to hire multiple AI-native software engineers who are passionate about leveraging modern AI coding tools and building products that solve complex real-world problems.

About the Role

We are looking for an AI-Native Full Stack JavaScript Engineer who enjoys building modern web applications while using AI as a core part of the software development workflow.

This is not a traditional software engineering role. The ideal candidate already relies on tools such as Claude Code, Codex, or similar AI-assisted development environments and sees AI as an essential productivity multiplier.

You'll help build next-generation financial research products powered by large language models and unstructured financial data.

Responsibilities

Design and build full stack web applications using the JavaScript ecosystem
Develop AI-powered features and workflows for financial research products
Work with structured and unstructured financial data
Collaborate closely with the CTO and product team
Use AI coding assistants (Claude Code, Codex, or similar) as part of your daily development process
Write clean, maintainable, and scalable code
Contribute ideas to product and technical discussions

Requirements

Must Have

Strong experience as a Full Stack JavaScript Engineer
Experience building modern web applications

Hands-on experience using AI coding tools such as:

Claude Code
Codex
or equivalent AI-assisted development tools

Excellent problem-solving skills
Strong English communication skills
Ability to work independently in a fully remote environment

Nice to Have

Experience working with Large Language Models (LLMs)
Experience processing or working with large datasets
Fintech or financial data experience
Startup or high-growth company experience

Location

The company is remote-first.

Preferred locations:

United Kingdom
Spain
Eastern Europe

Exceptional candidates from elsewhere in Europe will also be considered.

Working Hours

The company values results over fixed working hours.

While reasonable overlap with the team is expected, working hours are highly flexible. Engineers are trusted to manage their own schedules as long as they consistently deliver high-quality outcomes.

Compensation

Highly competitive salary
Flexible depending on experience and impact
The company is willing to pay above market rates for exceptional candidates

Contract

Full-time engagement
Freelance/B2B contract preferred
Flexible contract arrangements available depending on location
The company treats long-term contractors as integral members of the team and offers flexibility around paid time off based on performance and mutual trust.

Interview Process

Recruiter screening
Technical interview with the CTO
Final interviews (if applicable)
Offer

Why Join?

Build AI products used by professional investors and hedge funds
Work directly with experienced technical leadership
Remote-first culture with flexible working hours
High level of autonomy and ownership
Opportunity to work with modern AI development workflows from day one
Small, high-performing team where your work has immediate impact