Senior Mobile Engineer

Hello We're Teya.

Teya is a payment and software service provider, headquartered in London serving small, local businesses across Europe. Founded in 2019, we build easy to use, integrated tools that enable our members to accept payments and boost business performance.

At Teya we believe small, local businesses are the lifeblood of our communities.

We're here because we don't believe there's a level playing field that gives small businesses with a fighting chance against the giants of the high street.

We're here because we see banks and legacy service providers making things harder for them. We don't think the best technology or the best service should be reserved for those with the biggest headquarters.

We're here to fight for a future where small, local businesses can thrive, and to commit the same dedication they offer all of us.

Become a part of our story.

We're looking for exceptional talent to join our mission. We offer a chance to create impact in a high-energy and connected culture, while benefiting from continuous learning opportunities, a supportive community which is proud to serve our mission, and comprehensive benefits.

Your Mission

To empower small and medium-sized businesses across Europe by building and enhancing Teya's mobile applications. Deliver scalable, secure, and innovative solutions that help business owners thrive and reconnect with the joy of running their businesses.

As a Senior Mobile Software Engineer at Teya, you will:

• Develop cross-platform mobile applications using Flutter and Kotlin.

• Write clean, maintainable, and secure code to address complex business problems.

• Prioritize performance, scalability, and maintainability in all development tasks.

• Seamlessly integrate various APIs and SDKs, ensuring reliability and efficiency.

• Focus on delivering a modern, intuitive, and user-friendly experience for merchants across Europe.

• Collaborate with cross-functional teams to align technical solutions with business objectives.

• Actively participate in critical project decisions, including architecture design, framework selection, and tool evaluation.

• Mentor and support team members, fostering a collaborative and growth-oriented environment.

• Continuously improve applications while applying automation best practices to reduce waste and error.

• Work within Agile/Scrum methodologies, ensuring timely delivery, iterative improvements, and collaboration across teams.

Key Responsibilities

• Build mobile applications that support payments acceptance, business account services, card issuing, and ePOS systems.

• Incorporate state-of-the-art technologies to enable offline capabilities, secure data storage, and dynamic app features like push notifications and deep linking.

• Ensure seamless app upgrades and support internationalization/localization.

• Collaborate with design and product teams to deliver a compelling user experience.

• Contribute to CI/CD pipelines, scalable logging, and observability practices.

• Embrace clean architecture principles, including Domain, Application, Infrastructure, and Presentation layers.

• Participate in daily stand-ups, sprint planning, and retrospectives as part of Agile workflows.

• Work closely with Product Owners to refine requirements and deliver incremental value in each sprint.

What you'll build

• Cross-platform payment SDKs that work seamlessly on Android and iOS

• Device abstraction layers that enable payment processing across different hardware configurations

• Developer tools and documentation that make payment integration simple and reliable

• Standardized APIs that reduce complexity for third-party integrators

• Secure, compliant payment processing components that meet industry standards

Your Story:

Essential Requirements

• Kotlin Multiplatform Experience: Hands-on experience developing and shipping KMP projects, including shared business logic and platform-specific implementations

• Mobile Development: Strong background in either Android (Kotlin) or iOS development with understanding of mobile app architecture patterns

• SDK Development: Experience building SDKs, libraries, or frameworks that other developers consume, with focus on API design and developer experience

• Payment Technology Knowledge: Understanding of contactless payments, NFC technology, or financial transaction processing (preferred but not required for exceptional KMP candidates)

Technical Skills

• Advanced Kotlin: Deep expertise in Kotlin language features, coroutines, and multiplatform-specific APIs

• Cross-Platform Architecture: Understanding of shared code strategies, expect/actual patterns, and platform-specific implementations

• API Integration: Experience with RESTful services, secure communication protocols, and third-party API integration

• Testing & Quality: Strong testing practices including unit testing, integration testing, and automated testing frameworks

• Security Awareness: Understanding of secure coding practices, especially relevant to financial/payment applications

Preferred Qualifications

• Experience with payment processing systems, EMV standards, or financial technology

• Knowledge of NFC technology, contactless payment protocols, or mobile payment frameworks

• Background in modular architecture, dependency injection, and clean architecture principles

• Experience with CI/CD pipelines and automated deployment for multi-platform projects

• You have experience with design tools such as Figma and Canva

• You're highly organised with strong project management skills

• You're a great communicator and collaborator

• You have a growth mindset with eagerness to learn and a hands-on attitude

• You're happy to work from our new headquarters in Central London at least 3-days a week

The Perks

• We trust you, so we offer flexible working hours, as long it suits both you and your team;

• Health Insurance;

• Physical and mental health support through our partnership with MyFitness;

• 25 days of Annual leave (+ Bank Holidays);

• Possibility to visit other Teya offices to meet colleagues in instances when travel is safe and appropriate;

• Friday lunch in the office;

• Friendly, comfortable and high-end work equipment and informal office environment;

• Hybrid work mode policy.

Teya is proud to be an equal opportunity employer.

We are committed to creating an inclusive environment where everyone regardless of race, ethnicity, gender identity or expression, sexual orientation, age, disability, religion, or background can thrive and do their best work. We believe that a diverse team leads to better ideas, stronger outcomes, and a more supportive workplace for all.

If you require any reasonable adjustments at any stage of the recruitment process whether for interviews, assessments, or other parts of the application—we encourage you to let us know. We are committed to ensuring that every candidate has a fair and accessible experience with us.