Senior Backend Engineer (Tech Lead)

Sunbit builds financial technology for real life, offering a next-generation, no-fee credit card managed through a mobile app and a point-of-sale payment option available at over 25,000 service locations including auto dealerships, optical practices, dentist offices, veterinary clinics, and specialty healthcare services.

• 7+ years of professional experience as a Backend Engineer or similar role building scalable server-side applications.
• Strong proficiency in Java or Kotlin.
• Solid experience with microservices architecture and distributed systems.
• Experience in domain ownership.
• Hands-on experience with relational databases (MySQL, PostgreSQL) and non-relational databases (MongoDB, DynamoDB).
• Experience with AI tools and interest in applying them in everyday work.
• Familiarity with message queue/streaming technologies such as Kafka, RabbitMQ, or Amazon SQS.
• Good understanding of cloud platforms, preferably AWS.
• Experience building secure, high-performance APIs and handling sensitive data.
• Strong problem-solving skills, attention to detail, and ability to work effectively in a fast-paced, collaborative environment.
• Excellent communication skills and fluency in English.
• B.Sc. in Computer Science or equivalent practical experience.

Preferred Experience:

• Expertise in Spring Framework (Spring Boot).
• Experience with fintech or payment processing systems, compliance requirements (e.g., PCI DSS), or secure transaction handling.
• Familiarity with containerization (Docker) and orchestration (Kubernetes).
• Knowledge of CI/CD pipelines and infrastructure as code.
• Exposure to modern development tools and practices (Git, automated testing, observability tools).

• Design and implement scalable backend architecture, services, and APIs for core financial products and features.
• Develop high-quality, maintainable server-side code with emphasis on performance, reliability, and security.
• Build and maintain RESTful APIs (and potentially GraphQL) to support mobile and web applications.
• Manage relational and non-relational databases, optimize queries, and ensure data integrity and consistency.
• Collaborate with cross-functional teams (frontend, product, QA, DevOps) to translate business requirements into technical solutions.
• Participate in code reviews, write unit/integration tests, and contribute to improving engineering practices.
• Monitor system performance, troubleshoot production issues, and participate in on-call rotations as needed.
• Contribute to continuous improvement by refactoring legacy code, adopting best practices, and staying current with relevant technologies.