Senior Software Engineer (Payments)

About Us

We are a well-funded iGaming startup on a mission to redefine the future of online gaming. Built on a foundation of transparency, integrity, and responsible gaming, our next-generation SaaS Game & Entertainment platform empowers operators to launch and scale dynamic gaming experiences with unmatched speed and confidence.

Job Summary

We are looking for a Senior Software Engineer (Payments) to build and scale the payments infrastructure of a high-load CS2 skins gambling product. You will own multiple PSP integrations and develop secure, reliable payment flows covering deposits, withdrawals, refunds, monitoring, fraud detection, reconciliation, disputes, and chargebacks. This is a hands-on role with significant technical ownership and close collaboration with Product, Payments, Finance, Compliance, and Fraud teams.

Required Qualifications (Must-Have)

• 7+ years of commercial software development experience, including complex production fintech web applications.
• 5+ years of back-end development experience with Node.js and TypeScript in high-load fintech environments, including payments, banking, and trading.
• 3+ years of experience as a Full-stack JavaScript/TypeScript Developer.
• Proven experience integrating multiple PSPs through APIs, SDKs, webhooks, hosted fields, iFrames, or redirect-based payment flows.
• Strong understanding of payment lifecycles, including authorization, capture, settlement, refund, reversal, dispute, and chargeback processes.
• Experience designing high-load, fault-tolerant, event-driven, or distributed systems.
• Strong knowledge of REST APIs, webhooks, idempotency, retries, queues, concurrency, and transaction consistency.
• Experience with relational and non-relational databases, automated testing, monitoring, logging, and production incident investigation.
• Proficiency in React.js, Svelte, Vue.js, Angular, or another modern front-end framework.
• Experience with state management tools such as Redux or MobX and styling technologies such as SCSS or Tailwind CSS.
• Strong understanding of application security, authentication, authorization, encryption, and secure handling of payment data.
• Fluency in Ukrainian or Russian and proficiency in English for technical collaboration in a remote/global team setting.
• Ability to work within the CET/EET time zone.
   

Your Advantage (Nice-to-Have)

• Experience in iGaming, gambling, gaming, marketplaces, digital goods, or other high-risk industries.
• Experience with cards, bank transfers, open banking, crypto, wallets, gift cards, or alternative payment methods.
• Knowledge of CS2 skins, Steam inventories, skin trading, or virtual-item marketplaces.
• Experience building payment orchestration, smart routing, cascading, failover, and decline-recovery systems.
• Knowledge of fraud prevention, risk scoring, velocity rules, device fingerprinting, and transaction monitoring.
• Experience with reconciliation, settlements, PSP fees, reserves, disputes, and chargeback workflows.
• Familiarity with PCI DSS, KYC, AML, sanctions screening, or responsible gambling requirements.
• Experience with AWS, Kafka, RabbitMQ, SQS, Grafana, Datadog, Sentry, ELK, or similar technologies.
• Experience mentoring engineers or contributing to payment architecture and engineering standards.
   

Ideal Candidate

You are a hands-on senior engineer with strong fintech and payment-processing expertise. You understand that payment systems must be secure, resilient, observable, and financially accurate. You can independently investigate failed transactions, work with PSP logs and technical support, and turn complex business and compliance requirements into reliable technical solutions.

You are comfortable building a payments function from the ground up, making architectural decisions, and taking ownership of the full transaction lifecycle.

Key Responsibilities

• Design and build the product’s payments infrastructure for deposits, withdrawals, refunds, reversals, settlements, and disputes.
• Integrate and maintain multiple PSPs and alternative payment methods.
• Build a scalable payment-orchestration and provider-abstraction layer.
• Implement secure transaction processing with idempotency, retries, callback validation, duplicate prevention, and consistent transaction states.
• Develop payment routing, cascading, failover, and provider-prioritization logic.
• Build real-time monitoring, dashboards, alerts, and internal payment-management tools.
• Implement fraud detection, transaction monitoring, risk controls, and payment limits.
• Develop reconciliation processes for transactions, settlements, fees, refunds, reserves, and chargebacks.
• Build dispute and chargeback workflows, including evidence collection and deadline tracking.
• Investigate payment incidents, provider outages, delayed callbacks, and reconciliation discrepancies.
• Improve payment approval rates and checkout conversion through technical and performance analysis.
• Develop payment-related front-end components for deposits, withdrawals, payment statuses, and error handling.
• Ensure payment systems adhere to secure engineering practices and PCI DSS requirements.
• Maintain automated tests and technical documentation for payment integrations and transaction flows.
• Participate in architecture and code reviews, provide production support, and mentor other engineers.
   

Recruitment Process

1. Application Review (1-2 weeks).
   If you have not received a response from the recruiter, your experience is irrelevant to this vacancy.
2. Interview Stages (2-3 weeks).
   1. Prescreen Call with Recruiter - 30 min.
   2. Technical Interview with CTO and CPO - 1.5-2 hr.
3. Job Offer
4. Referrals: Employment and Background Check
    

We Offer

• Competitive compensation package (depends on your experience and skills).
• Fully remote work with flexible hours (within the CET/EET time zone) from any location of your choice.
• 29 business days of vacation and paid sick leave.
• Corporate equipment (laptops, monitors, etc.).
• Professional courses/certifications (200 EUR per year).
• Operating in a start-up environment with cutting-edge technologies and unlimited investments in software upgrades, free from legacy systems or outdated solutions.
• Values-driven culture with a friendly and supportive work environment.
• Matrix organizational structure designed to streamline communication, remove barriers, and promote efficiency.
   

We’re not looking for someone to just “join the team” - we’re looking for someone ready to shape the product, lead meaningful growth, and make an impact from day one.

If that sounds like you, send over your CV and let’s talk!