Java/Kotlin Backend Developer

Backend

3+ years of experience

remote

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. It contains multiple integrations with payment systems, providers, and other gateways and processors, including 3DS.

We are looking for a Java/Kotlin Developer who will create new payment integrations for our own homegrown Payments Platform.

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;
Defining technical and business epics, preparing tasks, and conducting estimations.

Requirements

3+ years of commercial development experience with Kotlin;
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 Sourcing principles and experience with distributed messaging systems (e.g., Apache Kafka);
Strong understanding of engineering principles, test-driven development (TDD), and CI/CD processes;
Solid understanding of microservice architecture;
Ability to clearly and effectively communicate technical concepts in both Russian and English;
English proficiency level B1 or higher.

Will be a plus:

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).

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 (45 mins);
Technical Interview (1.5 hours);
Test Task (2-4 hours).