Senior Fullstack Engineer - Kotlin/Java Backend + React/TS

Zühlke Group; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Zühlke Group in London seeks a Senior Fullstack Developer to build and operate business-critical digital services. This backend-led role uses Kotlin or modern Java (17+), JVM ecosystem, APIs and event-driven workflows, with React/TypeScript for frontend.

You will work with product managers and designers, contribute to code quality, testing, and deployment pipelines, and explore AI-augmented tools to improve delivery while ensuring security and maintainability.

Qualifications

• Strong commercial experience building server-side apps with Kotlin or Java 17+.
• Good knowledge of the JVM ecosystem and backend practices.
• Experience designing, building and operating APIs and distributed services.
• Familiarity with relational databases and frontend with React/TypeScript.

Responsibilities

• Build and operate JVM-based services using Kotlin or Java.
• Design well-structured APIs and integrations.
• Develop reusable services and components for teams.
• Contribute to API standards, docs and versioning.
• Deliver end-to-end features connecting backend with web UI.
• Apply test-first or test-informed practices for automated tests.
• Explore AI-assisted tools to improve testing, docs and reliability.
• Ensure security, correctness and maintainability of outputs.

Skills

Kotlin

Java 17+

JVM ecosystem

APIs

Distributed services

Automated tests

Relational databases

React

TypeScript

CI/CD

Agile

AI augmentation

Tools

Spring Boot

Quarkus

Micronaut

Ktor

React

TypeScript

Docker

Kubernetes

GraphQL

Job description

Zühlke Group in London seeks a Senior Fullstack Developer to build and operate business-critical digital services. This backend-led role uses Kotlin or modern Java (17+), JVM ecosystem, APIs and event-driven workflows, with React/TypeScript for frontend.

You will work with product managers and designers, contribute to code quality, testing, and deployment pipelines, and explore AI-augmented tools to improve delivery while ensuring security and maintainability.