Android Developer, Banking App

Join the best bank to work for in Bulgaria*

Who we are:
Do you want to join a well-established bank with a start-up culture? No, we’re not joking!

We, at tbi, have been one the most profitable banks for years and we are growing at a fast pace. We’re a bank with a long history of success that operates as a start-up and we’re always on the lookout for new opportunities to grow our business. How do we do that?

It's all about our people. Our team is made up of brave, passionate and caring people who don’t just want to follow the same path – we want to transform into mobile-first, state-of-the-art lifestyle ecosystem. Our colleagues love working here – 80% of them would recommend tbi as an employer to their friends and family. Our people are engaged in challenging and meaningful work, inspired to grow their potential and career, encouraged to learn and empowered to take decisions. That’s not corporate babble, it’s what our people say.

Do you want to play a key role in our unique success story?

If so, we're looking for an Android Developer for our Banking App to join our team on the journey to success!

What You’ll do:

• Develop and maintain Android mobile application using Kotlin

• Design and implement scalable mobile architectures (e.g., MVVM, Clean Architecture, modularization) to support long-term maintainability and team growth

• Build and manage complex user journeys related to shopping, cashback, and payments, ensuring accurate state handling (pending, success, failed scenarios)

• Implement and maintain in-app browser (WebView) solutions, including session & cookie management, deep linking, redirect handling, and secure domain validation

• Integrate tracking and attribution flows to support cashback and partner journeys

• Work with Kotlin Coroutines and Flow to handle asynchronous operations, concurrency, retries, and race conditions in critical user flows

• Integrate and maintain communication with backend systems via REST APIs, ensuring reliable data exchange, error handling, and backward compatibility

• Collaborate closely with backend teams to ensure idempotent operations, safe retries, and prevention of duplicate transactions

• Implement robust state management strategies, separating UI state, domain logic, and cached backend data

• Design and optimize data caching mechanisms, balancing performance with data accuracy (especially for financial data)

• Ensure app reliability through effective error handling, logging, and monitoring (e.g., Crashlytics or similar tools)

• Optimize application performance, memory usage, and responsiveness, particularly in complex and WebView-heavy flows

• Apply secure coding practices, including secure storage, token management, and protection of sensitive user data

• Write clean, maintainable, and testable code, contributing to unit and integration testing

• Participate in code reviews and contribute to continuous improvement of code quality and architectural decisions

• Collaborate cross-functionally with Product, QA, and Design teams to deliver user-centric, high-quality features aligned with business goals

What you’ll need to succeed:

• Bachelor’s degree in Computer Science or a related field

• 3+ years of experience in mobile development

• Strong experience with Kotlin, Compose and modern Android development practices

• Solid understanding of Android application lifecycle, threading, and performance optimization

• Familiarity with in-app browser solutions (WebView)

• Experience in integrating RESTful APIs

• Experience with unit testing

• Practical knowledge of creating, managing, and maintaining tasks in JIRA

• Excellent command of written and spoken English

• Ability to work effectively in a cross-functional team environment

• High attention to detail with strong analytical and problem-solving capabilities

  
  

What we offer:

• Seize the opportunity to grow your career

• Engage in exciting and meaningful work

• Get recognition for your work and attitude

• Become part of a large, friendly and supportive team with 23 nationalities

• Get additional private health insurance

• Receive special prices for multisport card and multiple retailers

• Obtain preferential prices for our banking products

• Enjoy a great location in Sofia’s city centre near National Palace of Culture and South Park

• Bring your furry bestie: Let's make work pawsome

Visit our Career Page to learn more about what makes us different.

If this sounds like something you’d be interested in, we'd love to hear from you!

To apply for this position, please send us your CV in English.

We'd love to get back to everyone, but due to the number of applications we receive, we can only contact the shortlisted candidates.

*We are ranked the top bank and top 3 employer to work for in Bulgaria according tо WhereWeWork 2025 employer ranks.

All applications are treated with utmost confidentiality.

By submitting your job application to tbi bank, you confirm that you have read the document named “Information related to personal data processing for job applicants” publicly available on tbi Career page.