Kotlin/Java Developer (Merchant Response)

Our team is developing a payment gateway for accepting funds from users on behalf of merchants, as well as sending funds from merchants to users. The system involves storing user payment data and is subject to PCI DSS compliance.

Responsibilities

Developing new payment features and services
Processing and resolving requests from technical support and users as part of daily duties
Designing and implementing APIs (external and internal)
Creating and maintaining processes in Camunda
Participating in the design and development of high-load system architectures
Supporting and enhancing existing solutions and services
Writing high-quality, test-covered code (unit tests, integration tests)
Conducting code reviews
Optimizing system performance and database queries
Analyzing and resolving production incidents and bugs

Languages

Work format: Remote
Seniority: Senior
Posted: 23 Sept 2026
Last verified: 25 Oct 2026
Apply by: 22 Nov 2026

Required

3+ years of commercial development experience with Kotlin
Experience with the Spring Framework
Experience designing and optimizing relational databases (MySQL)
Experience with NoSQL databases (Redis)
Practical experience using AI-assisted coding tools (Claude, Codex, ChatGPT, Codeium, etc.) to improve speed and quality of development
Knowledge of Event-Driven Architecture principles and experience working with distributed messaging systems (e.g., Apache Kafka)
Excellent command of core software development and design principles, test-driven development (TDD), and CI/CD processes

Nice to have

Solid understanding of PCI DSS standards, ISO 27001, and other information security methodologies
Practical experience working with AWS
Experience with Jira and GitLab CI/CD.

Mayflower

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