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