Android Engineer for Payment Terminals

**The Mission** Wallee Group is a leader in advanced payment solutions, providing robust, scalable, and secure payment technology across multiple markets. Our solutions power payment experiences across Android-based payment terminals, mobile devices, and integrated merchant environments. With teams across several countries, we work collaboratively to build reliable payment technology that operates in highly regulated and security-critical environments. **The Role** Wallee is looking for an experienced Android Engineer to join our payment terminal engineering team in Vilnius. You will work primarily on our Android-based payment terminal platform, developing and maintaining software that sits at the heart of payment processing on physical terminals. This is not a typical consumer Android application role. You will work close to the Android platform, payment applications, terminal hardware, network communication, payment protocols, and security-sensitive transaction flows. You will collaborate with engineers across Android, TypeScript, backend, payment protocols, QA, and certification to deliver reliable software used on payment terminals in production. ## Tasks **The Impact You’ll Make** * **Build Payment Terminal Software:** Develop and maintain Android applications and components running on dedicated payment terminals. * **Work Across the Platform:** Integrate Android components with payment applications, device services, hardware interfaces, APIs, and communication protocols. * **Develop Reliable Transaction Flows:** Implement and troubleshoot payment functionality where correctness, stability, and predictable behaviour are critical. * **Champion Security:** Work with security-sensitive systems involving TLS, certificates, cryptographic operations, secure key handling, and PCI requirements. * **Solve Complex Problems:** Investigate issues across application, Android platform, device, network, and payment protocol layers. * **Drive Engineering Quality:** Review code, improve architecture, write automated tests, and help maintain a reliable and maintainable codebase. * **Collaborate Across Teams:** Work closely with Product, QA, certification teams, and other engineers to turn payment requirements into production-ready solutions. * **Provide Technical Expertise:** Support complex technical investigations and help other teams understand terminal behaviour, APIs, and integration requirements. ## Requirements **What You Bring to the Table** * **Strong Android Experience:** Solid professional experience developing Android software using **Kotlin and Java**. * **Android Platform Knowledge:** Good understanding of Android application architecture, services, lifecycle, IPC, threading, networking, and debugging. * **Engineering Fundamentals:** Ability to design maintainable software, understand existing complex systems, and confidently troubleshoot production issues. * **Network Knowledge:** Practical experience with **TCP/IP, HTTP, and TLS**. * **Security Mindset:** Understanding of security fundamentals such as encryption, certificates, symmetric/asymmetric cryptography, hashing, and secure data handling. * **Quality First:** You write readable, maintainable, documented, and well-tested code rather than simply making things work. * **TypeScript:** Experience with **TypeScript** is a strong advantage, as parts of our payment terminal stack use it. * **Communication:** Professional fluency in English and the ability to collaborate effectively in an international engineering environment. Experience with **payment terminals, payment systems, embedded Android devices, POS systems, EMV, PCI, or payment protocols** is an advantage, but not required. ## Benefits **Why Join Wallee?** * **Modern Workspace:** A beautiful office in the heart of Vilnius — comfortable, bright, and collaboration-ready. * **True Flexibility:** Flexible daily hours and a **4-week Work from Anywhere** policy every year. * **Interesting Engineering Problems:** Work on software where Android, hardware, security, networking, and financial technology meet. * **Real Ownership:** Work in a flat engineering environment where you can influence technical decisions and take ownership of meaningful parts of the platform. * **Growth & Culture:** **Competitive compensation of €2,500–€6,000 gross/month**, depending on experience, seniority, and technical expertise, plus personal development budgets and company events. * **The Perks:** Fresh fruit, snacks, and high-quality coffee. Don’t tick every box? Neither do most great hires. If the role sounds interesting and you have strong Android fundamentals, we’d still like to hear from you.