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.