Kotlin/Java Developer (Integration)

We develop an independent payment orchestration platform operating in a highly regulated environment and subject to PCI DSS compliance. Our platform connects merchants to multiple payment gateways, processors, acquirers, and alternative payment methods, enabling seamless payment processing on a global scale. As a Kotlin/Java Developer (Integration), you will focus on building and maintaining payment integrations with external providers, designing reliable and scalable services, and automating integration processes. Working closely with Product, QA, Infrastructure, and other engineering teams, you will help accelerate the delivery of new payment connections, optimise existing integrations, and contribute to the development of tools that improve efficiency and reduce time-to-market. This role involves solving complex integration challenges, ensuring high standards of security and performance, and supporting a robust payment ecosystem used by merchants worldwide.

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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.

Important and Challenging Tasks:

Creating and developing reliable payment solutions with high levels of security and performance.
Optimizing performance and scalability of payment systems.
Designing and maintaining tools that leverage AI for code generation to reduce time-to-market while maintaining code quality.
Integrating complex external payment services and processors.
Participating in ensuring system compliance with high-security standards (PCI DSS and others).

Requirements

3+ years of commercial development experience with Kotlin.
Experience with the Spring Framework.
Experience in developing payment solutions (billing, payment gateways, payment processors, exchanges).
Practical experience integrating with external 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 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.
Strong understanding of microservice architecture.
Ability to clearly and effectively communicate technical concepts in Russian and English.
English proficiency level B1 or higher.

Preferred Qualifications

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).

Technology Stack

Kotlin / Java
MySQL
Redis
Apache Kafka
Camunda 8
Redshift
Keycloak
AWS
Spring Framework
GitLab CI/CD
Jira
Sentry
Kibana
Grafana
AI-assisted coding tools (Copilot, ChatGPT, Codeium, etc.)

Conditions

We know that top talent thrives in the right conditions, so here's what you can expect when joining us:

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

HR interview (40 min).
Technical interview (1.5 hour).
Test task.
Final interview (45 min).