Senior Engineer building scalable data processing applications and ETL pipelines for Capgemini’s digital transformation services. Optimizing distributed data workloads for analytics, reporting, and machine learning.
About the role
- Full Stack Engineer developing payment processing solutions for a SaaS fintech startup. Building and improving subscription management features while ensuring code quality and system reliability.
Responsibilities
- Ship key product features: Build new subscription management capabilities-lifecycle state transitions, billing logic, payment method handling. Features you ship will go directly to production
- Refactor and improve existing systems: Identify bottlenecks, improve code quality, and enhance our payment processing flows. We'll teach you how to read complex codebases and make them better
- Debug production issues: Investigate payment failures, trace issues through logs and databases, and implement fixes. Learn systematic debugging in distributed systems
- Design and implement database changes: Write migrations, design schemas for new features, and optimize queries for financial data accuracy
- Build and extend APIs: Develop REST endpoints using NestJS, implement business logic, and ensure type safety across the stack
- Write comprehensive tests: Add test coverage for new features and existing code. Learn testing strategies that matter for production systems
Requirements
- 3+ years of professional experience building production web applications with NestJS, Next.js, and TypeScript
- Hands-on experience working with PostgreSQL based databases (Supabase is a strong plus) including schema design, migrations, and performance optimization
- Experience deploying and operating production systems using Vercel and AWS
- Direct experience integrating with eCommerce platforms (Shopify) and at least one payment processor such as Stripe, Adyen, Airwallex, or NMI in real production environments
- Proven experience building and maintaining payment flows (billing logic, payment method handling, retries, webhooks, and failure handling)
- Experience designing and consuming REST APIs with strong typing and clear contracts across services
- Comfort working with production logs, databases, and monitoring tools to debug payment and financial issues
- Experience writing meaningful automated tests for critical business logic (especially around billing and payments)
- Strong understanding of data integrity, idempotency, and error handling in financial systems
- Nice to have:
- Experience with AWS EventBridge, SQS, ECS, or similar event and messaging infrastructure
- Familiarity with containerized environments and orchestration (Docker, Kubernetes)
- Exposure to PCI DSS and SOC 2 compliance considerations in payment or fintech systems
- What we explicitly look for:
- You have used these tools and systems in real production environments, not just side projects or tutorials
- You have shipped payment-related features that real users rely on
- You understand the operational and reliability requirements of financial systems.
Benefits
- Fully remote role with EST working hours
- High-impact position with real ownership and autonomy
- Fast-growing SaaS and fintech environment with real problems to solve
- Clear growth path as the company scales
- Performance-based bonuses and career development opportunities
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