Junior Ruby Developer – HTML5, Rails Javascript, TDD

Company: Quant Capital
Apply for the Junior Ruby Developer – HTML5, Rails Javascript, TDD
Location: London
Job Description:

Overview

In this role you will contribute to building and maintaining Rails-based applications and a new web platform, collaborating with a high-caliber tech team. You’ll design REST APIs, implement greenfield features, and participate in code reviews as the platform stabilises on Java, Ruby, and AWS. The environment blends fast-paced fintech challenges with a relaxed, open culture that rewards technical curiosity. This is a hands-on role for a tech-focused junior developer looking to grow quickly while delivering real impact.

Responsibilities

  • Designing and developing new applications with the team
  • Designing and helping implement a REST API
  • Helping build a brand-new web platform in Ruby
  • Participating in code reviews
  • Stabilising the web platform built on Java, AWS, and Ruby
  • Collaborating in an Agile-like team to deliver high-quality applications

Key requirements

  • Educated to degree level or equivalent
  • Experience designing and building Rails applications
  • Ruby
  • JavaScript
  • HTML
  • CSS
  • Working knowledge of Linux
  • Experience with mobile applications (beneficial)
  • Hadoop experience (beneficial, not required)
  • Collaborative mindset
  • Proactive problem-solving
  • Curiosity for cutting-edge technology
  • Ruby
  • Java
  • Ruby on Rails

Posted: September 14th, 2026