Senior Software Engineer - FinTech Scale-Up with Equity

Ctrl Alt; Belfast City District; Hybrid; GBP 70,000 - 100,000; Full time

Benefits offered by this job

Stock options

Private healthcare

26 days annual leave

MacBook and equipment

Salary sacrifice schemes

Modern offices in London and Belfast

Job summary

Ctrl Alt is seeking a Senior Software Engineer to join our Belfast or London team. You’ll design, build and maintain high‑performance, scalable solutions in a fast-paced scale‑up environment, shaping the future of on‑chain infrastructure in digital capital markets.

You'll work with TypeScript/JavaScript backends, build robust RESTful APIs, and collaborate across engineering, product, and leadership to deliver impactful features with strong testing and CI/CD practices.

Qualifications

• 5+ years of experience as a Software Engineer.
• Proficiency with TypeScript/JavaScript backend frameworks (Express, Next.js or similar).
• Experience writing performant backend code.
• Experience building RESTful APIs and API design.
• Experience in Agile environments with CI/CD and peer reviews.

Responsibilities

• Design, build and maintain high performing, scalable solutions.
• Extend the app with features to help users understand investments and manage portfolios.
• Build APIs for partners to access and place orders on our platform.
• Turn loosely defined problems into solid, tested software solutions.
• Collaborate with engineers across the company.
• Advocate coding best practices to raise the bar for you and your team.
• Mentor engineers on your team.

Skills

5+ years experience

TypeScript/JavaScript

Backend development

RESTful APIs

CI/CD Agile

React/React Native

Tools

Express

NextJS

Job description

Ctrl Alt is seeking a Senior Software Engineer to join our Belfast or London team. You’ll design, build and maintain high‑performance, scalable solutions in a fast-paced scale‑up environment, shaping the future of on‑chain infrastructure in digital capital markets.

You'll work with TypeScript/JavaScript backends, build robust RESTful APIs, and collaborate across engineering, product, and leadership to deliver impactful features with strong testing and CI/CD practices.