Kotlin/Java Developer (Integration)

About the Position

Kotlin/Java Developer (Integration)

Join Mayflower as a Kotlin/Java Developer (Integration) to develop and optimize payment integrations and services in a fully remote role.

Responsibilities

• Developing new payment integrations and services;
• Automating and optimizing integration processes;
• Analyzing external provider documentation, conducting rapid checks, and defining epics and tasks based on Proof of Concept;
• Participating in the design and development of high-load system architectures;
• Supporting and improving 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;
• Processing and resolving requests from technical support and users as part of daily duties;
• Collaborating with the QA team to ensure the high quality of delivered products;
• Using AI-tools to accelerate delivery of integration modules and creating internal tools to generate integration code from business requirements;
• Maintaining technical documentation and writing technical specifications;
• Assisting in onboarding new developers and ensuring code quality;
• Definition and formation of technical epics - analyzing existing solutions, identifying opportunities to improve system architecture, performance, and reliability, preparing improvement proposals, and aligning them with the team lead and architect;
• Participation in the creation of business epics - analyzing requirements, assessing feasibility, and proposing alternative or optimized solutions based on technical expertise; collaborating with analysts and product managers to determine the best implementation approach;
• Preparing tasks based on approved epics, ensuring proper detailing and alignment with architectural and business requirements;
• Estimating task completion timelines, participating in sprint planning, and providing accurate technical time and effort estimates.

Requirements

• 3+ years of commercial development experience with Kotlin (Java will be a plus);
• Experience working with the Spring Framework;
• Experience developing and integrating payment solutions (billing, payment gateways, and payment processors);
• Practical experience integrating with external payment providers;
• Experience designing and optimizing relational databases (MySQL);
• Experience with NoSQL databases (Redis);
• Practical experience using AI-assisted coding tools (Copilot, ChatGPT, Codeium, etc.) to improve speed and quality of development;
• Ability to critically review AI-generated code, ensuring production-ready quality and compliance with company standards;
• Knowledge of Event-Driven Architecture principles and experience 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;
• Solid understanding of microservice architecture;
• English proficiency level B1 or higher.

Nice to Have

• Experience with Camunda (creating and supporting processes);
• 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;
• Experience in designing or developing internal tools that automate or accelerate integration development (e.g., generators based on business requirements).

We Offer

• Full remote work.
• Competitive compensation with a service contract.
• Transparent performance reviews twice a year, with bonus opportunities and salary adjustments.
• An annual allowance that you can use for home office improvements, sports activities, equipment upgrades, and more-tailor it to what benefits you most.
• Investment in your development: paid language courses, access to various learning platforms, and a mindfulness benefit, including psychological support with 50% coverage.
• Career growth in a fast-scaling project with opportunities to influence technical decisions.
• A culture of recognition: our peer reward program celebrates contributions from across the team.

Recruitment Process

1. HR interview (40 min);
2. Interview with hiring managers (1.5 hours);
3. Test task;
4. Final interview (1 hour) optional;
5. Recommendations check;
6. Offer.

About the Company

Mayflower is a company that values innovation, collaboration, and professional growth. We are committed to providing a supportive and dynamic work environment where our employees can thrive and contribute to impactful projects.