Senior Software Developer (GoLang) | Remote in Poland

About D8 Corporation
D8 Corporation develops the Gate2Bank (G2B) family of payment products used by issuing and acquiring banks across Europe, the CIS, and the Middle East.
Our solutions include EMV 3-D Secure platforms, card tokenization services for Apple Pay, Google Pay, Samsung Pay, and Click to Pay, as well as a complete e-commerce acquiring stack including a Payment Gateway, 3DS Server, and Access Control Server.
Our engineering team is headquartered in Riga, Latvia, where we build high-load, security-critical financial systems used by banks and payment providers internationally.

Position Overview
We are looking for a Senior Software Developer with strong backend engineering expertise and experience building secure, high-availability systems in regulated environments.
You will work on mission-critical payment infrastructure, contribute to architectural decisions, collaborate directly with banking partners, and help shape the next generation of our payment products.

Requirements
• 5+ years of professional software engineering experience, including significant experience in a senior or lead engineering role.
• Strong proficiency in at least two of the following technologies: Go, Java (Spring), C/C++, Node.js.
• Solid experience designing, developing, and operating service-oriented backend systems in production environments, including:• REST APIs
• asynchronous processing flows
• transaction handling
• observability and monitoring

• Hands-on experience with relational databases (Oracle and/or PostgreSQL), including:
• schema design
• query optimization
• performance tuning
• migration strategies

• Comfortable working in Linux environments (RHEL family) and with containerized deployments using Docker and docker-compose.
• Working knowledge of GitLab (or equivalent platforms) and CI/CD pipelines.
• Experience developing systems with strict security and compliance requirements such as PCI DSS, financial regulations, audit requirements, or similar standards.
• Strong architectural and analytical thinking with the ability to:
• evaluate technical trade-offs
• write clear technical documentation and design specifications
• lead technical discussions with internal teams and customer-side stakeholders

• Professional English communication skills (written and spoken) for technical documentation, API specifications, and customer-facing communication.
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Upper-intermediate (minimum B2 level) proficiency in Russian (written and spoken).

What We Offer
• Competitive compensation package based on experience and expertise
• Health insurance and standard social benefits
• Paid vacation and additional paid leave benefits
• Training and professional development budget
• Opportunity to work on international fintech and banking products used across multiple regions
• Modern engineering environment with a strong focus on quality, security, and technical excellence
• Flexible and collaborative work culture with direct impact on architecture and product decisions
• Long-term career growth opportunities within a stable and expanding international company