Principal JS Developer

Ocho; Belfast; Remote; GBP 80,000 - 100,000; Full time

Job summary

A leading tech firm is seeking a Principal Software Engineer to lead front-end development using React and modern JavaScript. This remote-first role across the UK and Ireland offers the opportunity to establish technical leadership while mentoring teams. Ideal candidates will have over 10 years of experience and a deep knowledge of design systems and performance optimization in application development.

Benefits

Remote-first work model

Inclusive culture with prioritised growth

Autonomy in small teams

Qualifications

• 10+ years' experience in software engineering with strong front-end expertise.
• Deep knowledge of JavaScript (ES6/7+), React, HTML, CSS.
• Strong analytical and problem-solving skills.

Responsibilities

• Lead the design and delivery of front-end applications using modern JavaScript and React.
• Build and maintain a reusable component library and define the design system.
• Mentor engineers and provide technical direction.

Skills

React

JavaScript

HTML

CSS

SASS

D3.js

OAuth2

Tools

Build tools

Job description

Overview

Principal Software Engineer - React
Location: Remote (UK / Ireland)
Type: Permanent | Full-time
Contact: Ryan Quinn on LinkedIn
Company: OCHO - Building Teams

The Opportunity

My client is hiring a Principal Software Engineer (React) to help shape the next generation of cloud-based solutions. This is a chance to establish technical leadership while staying hands-on, guiding the design and delivery of front-end systems that power merchant-first platforms at scale.

You'll work on data-rich, customer-facing applications using React and modern JavaScript, collaborating with UX and Product teams to build intuitive portals, secure hosted payment pages, and reusable component libraries.

If you're looking for a role where you can lead, mentor, and still code, this is it.

What You'll Do

• Lead the design and delivery of front-end applications using modern JavaScript and React

• Translate prototypes into pixel-perfect, responsive, accessible user interfaces

• Collaborate with UX, Product, and Engineering teams to deliver merchant-first solutions

• Build and maintain a reusable component library and help define the design system

• Contribute across the software lifecycle, from requirements through to release

• Mentor engineers, provide technical direction, and foster best practices in front-end development

• Support deployment activities, ensuring quality and reliability at scale

What You'll Bring

• 10+ years' experience in software engineering, with strong front-end expertise

• Deep knowledge of JavaScript (ES6/7+), React, HTML, CSS (SASS, LESS, or SCSS)

• Hands-on experience with build tools

• Strong design sense, able to deliver data-rich applications (D3.js or similar)

• Experience integrating with REST APIs and modern authentication (OAuth2 / OIDC)

• Track record of building scalable front-end systems optimised for performance

• Strong analytical and problem-solving skills, with the ability to lead by example

• Comfortable mentoring, coaching, and providing technical leadership across teams

Nice to Have

• Experience with Vue or Angular in addition to React

• Background in fintech, or other regulated industries

Why Join?

• Remote-first role across the UK and Ireland

• Opportunity to establish technical leadership while staying hands-on

• Work in small, empowered teams with autonomy and impact

• Inclusive culture where growth, learning, and collaboration are prioritised

Interested? Connect with Ryan Quinn on LinkedIn for an informal chat, or apply directly with your CV.

OCHO - Building Teams

Skills:
JavaScript AWS TypeScript