📋 External Recruiting Agencies

The job posting explicitly refers to the hiring entity as 'Our client', indicating that the posting organization (3HRsome) is a third-party recruitment or staffing agency acting on behalf of an undisclosed client.

This company was flagged and excluded from default search results. Proceed with caution.

3
Posted 1mo ago

AI-Native Full Stack JavaScript Engineer

3HRsome
United Kingdom or Spain or Europe
RemoteFull Time
Responsibilities
  • building applications
  • developing features
  • collaborating closely
Requirements
  • Strong full stack JavaScript experience
  • Familiarity with AI-assisted coding tools (Claude Code
  • Codex)
  • Ability to work independently in a fully remote environment, and strong English communication skills
Technical tools mentioned
Claude CodeCodexLarge Language Models (LLMs)JavaScript

Job description

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

  1. Recruiter screening

  2. Technical interview with the CTO

  3. Final interviews (if applicable)

  4. 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

Similar jobs

Full Stack JavaScript Engineer roles
3w
Save
Mark Applied
Hide
Desarrollador/a Full-Stack JavaScript (Vue 3 / Node.js) – Junior, Intermedio y Senior - Remoto
Barcelona, Catalonia, Spain
RemoteFull Time
Expleo
Expleo: Provides global engineering, technology, and business transformation consulting services.
1+ YOEExperience with Vue 3 and Node.js, TypeScript, HTML5/CSS, testing (Vitest/Jest), GitLab and Jira; 1+ years for junior, 4+ years for mid, 5+ years for senior.
Vue 3, Node.js, TypeScript, HTML5, CSS, GitLab, Jira, Vitest, Jest, OpenAPI (Swagger)
9y
Save
Mark Applied
Hide
Full Stack JavaScript Developer
London, England, United Kingdom
OnsiteFull Time
Syncoms
Syncoms: Operates global eCommerce brands and provides digital transformation technology.
3+ YOE3+ years JavaScript experience; Node.js, Angular/Knockout, jQuery; MongoDB; Azure; HTML5/CSS3; REST/JSON; SQL Server; ecommerce experience preferred.
JavaScript, JQuery, Knockout.js, Angular.js, Node.js, MongoDB, HTML5, CSS3, React.js, SQL Server 2012, Azure, AWS, REST, JSON, Jira, Git, GitHub, Bitbucket, Jasmine, MVC, ASP.Net, Udacity