Senior Full-Stack Engineer (Fintech) - Remote | $65,000 USD/year

SourceIn; London; Remote; USD 65,000; Full time

Job summary

Join a leading fintech startup as a Senior Full-Stack Engineer and help shape the future of banking integrations. In this fully remote role, you will enhance the platform's architecture, improve performance, and take part in the development of crucial features in a collaborative environment. Your experience with modern technologies like Vue.js, React, and TypeScript will be essential as you lead and mentor a growing engineering team.

Benefits

Fully remote work

Flexible schedule

Collaborative culture

Modern tech stack

Qualifications

• 5+ years in software development; 2-3 years in a senior/full-stack role.
• Strong experience with Vue.js and React.
• Proficiency in CSS (Tailwind, Bootstrap).

Responsibilities

• Build full-stack features with Vue.js/React and Node.js.
• Migrate services to Node.js v22 and TypeScript.
• Mentor junior engineers and document best practices.

Skills

Vue.js

React

JavaScript

TypeScript

CSS

Node.js

REST APIs

Docker

CI/CD

Microservices

Job description

About the job Senior Full-Stack Engineer (Fintech) - Remote | $65,000 USD/year

Senior Full-Stack Engineer (Fintech) Remote | $65,000 USD/year
Company: TheOneGate

Join us at TheOneGate, a fast-growing fintech startup revolutionising banking and payment integrations. We're building a secure, scalable, full-stack platform powering real-time financial services. We're hiring the core team to lead this transformation.

As a Senior Full-Stack Engineer, you'll play a key role in modernising our microservices architecture, improving performance, and building new banking features. This is a high-impact role where you'll shape technical decisions and mentor future team members.

Why Join Us?

• Fully remote: Work from anywhere with a flexible schedule.
• Modern tech stack: TypeScript, Vue.js, React, Node.js, Vite, Docker, CI/CD, and more.
• Supportive culture: Collaborative, engineering-led environment with a strong focus on code quality and security.
• Be a founding engineer: We're transitioning from third-party vendors to an in-house teamyoull be one of our first engineering hires.

Your Day-to-Day

• Build full-stack features with Vue.js/React and Node.js
• Migrate services to Node.js v22 and TypeScript
• Refactor legacy code to use modern frameworks and tooling (Vite, esbuild)
• Design and maintain shared component libraries
• Enhance system performance, test coverage, and reliability
• Collaborate with DevOps on CI/CD and containerisation
• Mentor junior engineers and document best practices

You Bring

• 58+ years in software development; 23 years in a senior/full-stack role
• Strong experience with Vue.js and React
• Deep JavaScript/TypeScript knowledge
• Proficiency in CSS (Tailwind, Bootstrap)
• Backend experience with Node.js and REST APIs
• Familiarity with microservices, Docker, and CI/CD
• Solid testing experience (Jest, Mocha, etc.)

Nice to have:

• Fintech, payment systems or secure coding experience
• Redis, WebSockets, or real-time system knowledge
• Familiarity with monorepos, Swagger/OpenAPI, and compliance (PCI, GDPR)

Security-First Mindset

Our platform handles sensitive financial datasecurity and compliance are central to everything we build.

What You'll Work On

• 15+ microservices (Node.js + NATS)
• Admin dashboards, customer portals, API gateways with WebSocket support
• Real-time reporting, fraud detection, secure wallet features, and more

Salary: $65,000 USD/year
Location: Fully Remote
Start Date: ASAP

Apply now and help shape the future of fintech with us. Send your CV and any relevant projects or GitHub links.