Senior Full-Stack Engineer (Kotlin/Java + React) - Hybrid

Formula.; Manchester; Hybrid; GBP 85,000 - 120,000; Full time

Job summary

Formula. is seeking a Senior Full Stack Engineer to join a technology consultancy delivering complex software for enterprise clients. The role is backend-led but truly full stack, building JVM services with Kotlin or Java 17+ and frontend with React and TypeScript.

You will contribute to architecture discussions, API design, code reviews, and explore AI-assisted tooling to enhance reliability and security. The position offers hybrid working from London, with two in-office days per week, and

Qualifications

• Extensive commercial experience with Kotlin or Java (Java 17+).
• Experience building and operating APIs with focus on reliability and performance.
• Frontend experience with React.js and TypeScript.

Responsibilities

• Build and maintain JVM-based services using Kotlin or modern Java, developing APIs and integrations to a high standard.
• Deliver end-to-end features, connecting backend services with React and Java.
• Contribute to technical discovery, architecture discussions, peer code reviews and API design standards.
• Experiment with AI-assisted engineering tools, validating outputs for correctness and security.
• Work closely with engineers and other stakeholders to deliver robust technical solutions.

Skills

Kotlin

Java 17+

React.js

APIs & microservices

TypeScript

Tools

CI/CD

Relational Databases

Job description

Formula. is seeking a Senior Full Stack Engineer to join a technology consultancy delivering complex software for enterprise clients. The role is backend-led but truly full stack, building JVM services with Kotlin or Java 17+ and frontend with React and TypeScript.

You will contribute to architecture discussions, API design, code reviews, and explore AI-assisted tooling to enhance reliability and security. The position offers hybrid working from London, with two in-office days per week, and