(Senior) Backend Engineer (f/m/d)

Wire is the leading end-to-end encrypted communication platform revolutionizing secure collaboration for businesses, critical infrastructure, and governments. As a Backend Software Engineer on the Haskell team, you will build and maintain core services for the Wire platform, focusing on improving scalability, reliability, and security while collaborating across teams.

Responsibilities:

• Backend development with Haskell: You develop and maintain backend services in Haskell and actively contribute to the evolution of our existing backend codebase
• Architecture & scalability: You contribute to architectural decisions and help make our backend platform more stable, scalable, and maintainable
• Feature development: You implement new features in close collaboration with Product, Client Engineering, CoreCrypto, Security, and QA
• Service-oriented systems: You work on large-scale service-oriented and federated architectures and bring your experience in designing, implementing, and operating scalable systems
• Data architecture & migration:You support the evolution of our data architecture, including the ongoing migration towards PostgreSQL
• Technical ownership within your scope: You take responsibility for backend topics within your feature scope and ensure that architecture, implementation approaches, and test strategies are aligned between the scope and the backend team
• Quality & testing: You build robust, well-tested software and collaborate with QA and engineering teams to continuously improve quality, stability, and security
• Knowledge sharing: You build deep knowledge of your technical scope, share this knowledge regularly with the backend team, and contribute to a strong engineering culture
• Security by design: You work on software where security, privacy, and reliability are core requirements and help establish Wire as the most secure messaging solution for large groups, governments, and enterprises

Requirements:

• Proven experience in backend development with Haskell
• At least 3 years of experience developing scalable backend systems or distributed services
• Experience with service-oriented architectures
• Structured and independent work style
• Good understanding of software architecture, API design, testing, and long-term code maintainability
• Comfortable working in cross-functional teams
• Ability to communicate technical decisions clearly
• Interest in secure communication systems, privacy, and modern cryptography
• Fluent English
• Experience with Servant, Polysemy, or comparable Haskell libraries
• Experience with PostgreSQL or database migrations
• Experience with federated systems
• Experience with additional programming languages such as Rust or Go
• German language skills