Fullstack Engineer D Job (DRWN)

Darwin Recruitment; Berlin; Remote; EUR 96,000 - 165,000; Part time

Job summary

Darwin Recruitment is seeking a Senior Full-Stack Software Engineer for a 6-month freelance engagement. The position is 100% remote across Europe, working on scalable SaaS platforms, contributing to both backend (Java 17+, Spring Boot) and frontend (React, TypeScript).

You will own features through the full software development lifecycle, design robust APIs, and collaborate with cross-functional teams to deliver high-quality, resilient services.

Qualifications

• 5+ years of professional software engineering across backend and frontend.
• Strong commercial Java experience (ideally Java 17+) with Spring Boot.
• Strong commercial React and TypeScript experience with hooks and state management (Redux Toolkit, Context API or Zustand).
• Experience designing and developing microservices and distributed systems with RESTful APIs.
• Good understanding of relational databases, ideally PostgreSQL, including schema design and query optimisation.

Responsibilities

• Work across the full software development lifecycle from design to deployment.
• Own technical solutions and contribute to ongoing improvement of platforms.
• Develop and scale modern digital products and services with a focus on reliability and performance.

Skills

Java

Spring Boot

React

TypeScript

Distributed systems

REST APIs

PostgreSQL

Event-driven

DDD

Testing frameworks

Tools

Docker

Kubernetes

CI/CD

AWS

Prometheus

Grafana

Datadog

OpenAPI/Swagger

Job description

Job title – Senior Full-Stack Software Engineer

Client Location – Remote (Europe)

Remote work offering – 100% Remote

Client Industry – SaaS

Contract Length – 6 months

Contract type – Freelance

Joining an established, cross-functional engineering team responsible for developing and scaling modern digital products and technology platforms. You’ll work across both backend and frontend development, designing and delivering scalable applications and services.

You’ll contribute throughout the full software development lifecycle, taking ownership of technical solutions from initial design through to deployment and ongoing improvement.

Key Skills & Experience

• Strong commercial Java experience (ideally Java 17+) and Spring Boot.
• Strong commercial React and TypeScript experience, including hooks, functional components and state management (Redux Toolkit, Context API or Zustand).
• 5+ years of professional software engineering experience across both backend and frontend development.
• Experience designing and developing microservices and distributed systems, with strong RESTful API design skills.
• Good understanding of relational databases, ideally PostgreSQL, including schema design and query optimisation.
• Experience with event driven or asynchronous architectures
• Familiarity with Domain Driven Design principles, including bounded contexts, aggregates and domain events.
• Experience with backend and frontend testing frameworks.

Desirable experience:

• Docker and Kubernetes.
• CI/CD pipelines and cloud environments, ideally AWS.
• Observability and monitoring tools such as Prometheus, Grafana or Datadog.
• OpenAPI/Swagger and contract testing.
• React Native.