Android Engineer

About the role

Wallee Group is looking for an experienced Android Engineer to join its Hamburg office. You will help build and enhance secure, high‑performance payment solutions that power tap‑and‑pay experiences for merchants worldwide.

Key responsibilities

• Develop and optimise terminal software, SDKs and cloud network protocols to ensure seamless tap‑and‑pay functionality.
• Research and implement cryptographic solutions to meet PCI compliance and protect payment data.
• Collaborate with Product Engineering to translate user stories into robust, performant features.
• Act as a technical advisor for SDKs and APIs, mentor 3rd‑level support, and enforce high code quality through reviews.
• Own complex troubleshooting tasks to maintain the reliability and availability of global payment systems.

Required profile

• Strong command of Kotlin and Java for Android development.
• Solid understanding of cybersecurity fundamentals, including symmetric/asymmetric ciphers and cryptographic hashes.
• Practical experience with TCP, HTTP and TLS protocols.
• Ability to write readable, well‑documented, unit‑tested code.
• Professional fluency in English and a collaborative mindset.

Required skills

• Kotlin
• Java
• Android platform
• TCP
• HTTP
• TLS
• TypeScript (valued)

What we offer

• Modern office in the heart of Hamburg.
• Hybrid work model – three days onsite, flexible daily hours.
• 4‑week “Work from Anywhere” policy each year.
• Competitive compensation aligned with experience.
• Opportunity to work on cutting‑edge fintech and payment security projects.