Wallee Group

Android Engineer

• Develop and maintain Android applications and components running on dedicated payment terminals
• Integrate Android components with payment applications, device services, hardware interfaces, APIs, and communication protocols
• Implement and troubleshoot reliable payment functionality and transaction flows
• Work with TLS, certificates, cryptographic operations, secure key handling, and PCI requirements
• Investigate issues across application, Android platform, device, network, and payment protocol layers
• Review code, improve architecture, write automated tests, and maintain a reliable codebase
• Collaborate with Product, QA, certification teams, and engineers to deliver production-ready solutions
• Support complex technical investigations and explain terminal behaviour, APIs, and integration requirements

Full-stack Engineer

• Lead the squad responsible for payment modules connecting the platform to acquirers and payment schemes
• Own the architecture and technical roadmap of the payment modules
• Lead new acquirer integrations end to end, including analysis, design, implementation, certification, rollout and monitoring
• Manage technical debt in a mature codebase built on an in-house framework on top of Spring
• Drive platform evolution from Java 21 toward Java 25 and toward event-driven, fault-isolated services
• Set and uphold engineering standards for design reviews, code quality, automated testing and observability
• Lead, coach and grow a squad of engineers distributed across Switzerland, Lithuania and Ukraine
• Run regular 1:1s, provide feedback, create development plans and support career growth
• Hire and onboard engineers with the Head of Engineering
• Spread knowledge through documentation, pairing and rotation
• Own production quality through monitoring, alerting, incident response and root cause analysis
• Provide validated estimates and technical analysis for PI Planning and Definition of Ready
• Balance new features against reliability and technical debt reduction
• Collaborate with the Product Manager on discovery, shaping and prioritization
• Partner with the Head of Engineering on tribe-level goals, capacity and escalations
• Collaborate with other tech leads on standards, cross-squad initiatives and problem solving
• Interface with architecture and DevOps teams on designs, infrastructure and operations
• Support customer support with technical escalations and provide sales with feasibility answers

Technical Lead – Payment Modules, Acquirer Integrations

• Design, develop, and maintain backend services in Java running on AWS
• Build and optimize data processing and reporting pipelines handling large datasets
• Use AWS services including S3, Athena, Lambda, SQS, Redshift, and RDS to build scalable, cost-efficient solutions
• Own services in production, including monitoring, alerting, performance tuning, and incident response
• Collaborate with product and engineering teams across the tribe to deliver merchant-focused features
• Contribute to code reviews, technical design discussions, and continuous improvement of engineering practices
• Design, build, and operate backend services end to end, from architecture discussions to deployment and monitoring

Backend Software Engineer

• Design and develop highly resilient back-end systems using Java
• Own the end-to-end lifecycle of new features, from implementation through bug fixing and performance tuning
• Collaborate with product managers, UX designers, and QA to translate business needs into technical solutions
• Improve code quality through automated testing and code reviews
• Create clear, maintainable technical documentation
• Research and evaluate emerging technologies and methodologies
• Work within international Scrum teams to deliver scalable payment and finance technology

Android Engineer

Technical Lead – Payment Modules, Acquirer Integrations

Backend Software Engineer

Java Software Engineer – Payment Integration