Senior Software Engineer

Formula.; Manchester; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Hybrid London working

Strong technical standards

Job summary

Formula. is seeking a Senior Full Stack Engineer to join a backend-led, full-stack team building JVM-based services using Kotlin or Java and frontend interfaces in React and TypeScript.

You'll work on technically challenging projects, contribute to architecture discussions, code reviews, and API design, with hybrid work from London 2 days per week. If you enjoy AI-assisted tooling and strong engineering standards, we'd like to hear from you.

Qualifications

• Strong commercial experience with Kotlin or modern Java, ideally Java 17+.
• Frontend experience with React.js.
• Familiarity with CI/CD, relational databases and agile development.
• Curiosity about AI-augmented engineering and a willingness to develop new ways of working.

Responsibilities

• Build and maintain JVM-based services using Kotlin/Java; develop APIs and integrations.
• Deliver end-to-end features; connect backend with React/TypeScript UI.
• Contribute to technical discovery, architecture discussions, and API design standards.
• Collaborate with engineers and stakeholders to deliver robust technical solutions.
• Experiment with AI-assisted engineering tools and validate outputs for correctness and security.

Skills

Kotlin/Java

React.js

APIs & reliability

AI curiosity

Education

Bachelor's degree

Tools

CI/CD

Relational databases

Security best practices

Job description

We're working with an established technology consultancy delivering complex software solutions for a range of enterprise clients. The business has a strong focus on engineering quality and works on technically challenging projects where reliability, scalability and good software development practices are essential.

This Senior Full Stack Engineer role is backend-led but genuinely full stack. You'll build and operate business-critical services using Kotlin or modern Java, contribute to frontend interfaces in React and TypeScript, and work as a hands-on member of an experienced engineering team.

It's a strong opportunity for an engineer operating at senior level who wants to work on technically challenging projects while continuing to develop their engineering and architectural skills.

What you'll be doing:

• Building and maintaining JVM-based services using Kotlin or modern Java, developing APIs and integrations to a high standard
• Delivering end-to-end features, connecting backend services with React and Java
• Contributing to technical discovery, architecture discussions, peer code reviews and API design standards
• Experimenting with AI-assisted engineering tools where they add clear value, validating outputs for correctness and security
• Working closely with engineers and other stakeholders to deliver robust technical solutions

What we're looking for:

• Strong commercial experience with Kotlin or modern Java, ideally Java 17+
• Experience building and operating APIs with a good grasp of service reliability, security and performance
• Frontend experience with React.js
• Familiarity with CI/CD, relational databases and modern agile development
• Curiosity about AI-augmented engineering and a willingness to develop new ways of working

What's on offer:

• Hybrid London working, 2 days per week in office
• Collaborative teams with strong technical standards

If you're a Senior Full Stack Engineer with strong Java or Kotlin fundamentals looking to grow in a technically ambitious environment, we'd like to hear from you.

Due to the high volume of applications, not all applicants will receive feedback.