Senior Fullstack Developer (NestJS/React, iGaming)

TL;DR

Senior Fullstack Developer (NestJS/React, iGaming): Building backend services and React frontend for an observability platform that ingests real-time gaming data, computes GGR, and reconciles settlements with an accent on financial accuracy, tenant isolation, and performance. Focus on implementing BigInt arithmetic, immutable audit logs, management APIs, and live dashboards while leveraging AI tools for SDLC acceleration.

Location: Macedonia, Poland, or Symphony Anywhere

Company

Provider-side iGaming observability and revenue intelligence platform detecting revenue leakage between game providers and operators.

What you will do

• Build and harden NestJS backend with user accounts, JWT auth, RolesGuard, and tenant isolation.
• Migrate financial calculations to BigInt arithmetic for precise GGR computation.
• Implement immutable AuditLog across key flows for tamper-evident data mutations.
• Design management APIs for operators, providers, and users with validation and RBAC.
• Optimize performance via database indexing, Redis caching, and N+1 query elimination.
• Develop React frontend for login, onboarding, and revenue dashboards; write tests and collaborate with QA.

Requirements

• 5+ years software development, 3+ years React with complex state management, 3+ years Node.js/TypeScript ideally NestJS.
• Strong TypeScript, Prisma/PostgreSQL, auth patterns (JWT, RBAC), REST APIs in microservices/BFF.
• AWS (EC2, RDS, etc.), Docker, CI/CD (GitHub Actions), unit/integration testing (Jest etc.).
• Strong English (B2+); self-organised for distributed team.
• Proven daily use of AI tools (Claude, Cursor, Copilot etc.) for code, tests, debugging in regulated context.

Nice to have

• Regulated industries (iGaming UKGC/MGA, finance, healthcare), GDPR/PII handling.
• Financial calculations (BigInt, FX), audit logs, HMAC signing.
• Redis, Terraform, Elasticsearch, TDD, JIRA/Confluence, iGaming background.

Culture & Benefits

• Distributed team with Scrum ceremonies, code reviews, mentoring juniors/middles.
• Proactive, self-organised engineering culture emphasizing AI integration and efficiency.
• Agile environment with Product collaboration and focus on regulated financial-grade quality.