Samuel Ricko P.

I am a Senior Backend Engineer and Tech Lead with 6+ years of experience building and scaling production systems across FinTech, EdTech, and multi-tenant SaaS. I combine deep Node.js, NestJS, TypeScript, and PostgreSQL architecture with a high-velocity AI engineering workflow. 🚀 My Expertise Includes: - AI-Augmented Engineering: Orchestrating Claude Code, Codex, Cursor, and DeepSeek via custom harnesses (OpenCode / OMP) with strict architectural guardrails for 3x–5x delivery speed. - FinTech & Ledger Systems: Built a closed-loop wallet, double-entry ledger, and automated settlement engine for 70,000+ users using PostgreSQL advisory locks and idempotent webhooks. - Architectural Leadership: Led the zero-downtime migration of legacy monoliths into modular NestJS backends and a 20-service microservices ecosystem on Kubernetes. - Performance & Search: Cut API latency by 90% (from 1s to 50-100ms), integrated sub-50ms search with Meilisearch, and built deduplicated event pipelines (Redis, BullMQ, SQS, Kafka). - Payment & Banking Integrations: Integrated global and regional gateways and banking APIs (Stripe, Moyasar, Alinma Bank, Xendit, SendGrid, Twilio) plus OpenAI/Anthropic APIs. - Cloud & DevOps: Orchestrating deployments on Kubernetes (GKE/EKS), AWS (CDK, ECS, RDS), GCP (Cloud Build), and Docker with zero-downtime migrations and smoke tests. 🛠 Technical Stack: - Languages: TypeScript, Node.js, Go, SQL, PHP. - Frameworks: NestJS (Expert), Express.js, Fastify, Echo (Go), Laravel, React / Next.js. - Databases & Search: PostgreSQL (RLS, Advisory Locks), Prisma, TypeORM, MongoDB, ScyllaDB, MySQL, Redis, Meilisearch. - FinTech & Payments: Double-Entry Ledgers, Settlements, Stripe, Moyasar, Alinma Bank, Xendit. - Messaging & Queues: Kafka, RabbitMQ, BullMQ, AWS SQS/SNS, Redis Pub/Sub, gRPC. - AI Workflows: Claude Code, Codex, Cursor, DeepSeek, OpenCode, OMP, OpenAI / Anthropic APIs. - Cloud & CI/CD: Docker, Kubernetes (GKE/EKS), AWS CDK, Terraform, GCP Cloud Build, GitLab CI. 📊 Notable Achievements: - Scaled a KSA School Management & Wallet platform to 70,000+ users with zero-downtime NestJS refactoring, double-entry accounting, and Moyasar / Alinma Bank integrations. - Reduced payment processing time by 75% for a major payment gateway integration (Xendit). - Spearheaded the backend migration from AWS Amplify to a scalable NestJS architecture for a US-based AI platform. - Built a hotel management aggregator (Govesta) from the ground up, including full ERD design and system architecture. I work as a dedicated, 100% solo engineer (no agencies or subcontracting) and thrive in remote, high-ownership environments. You get the architectural rigor of a Senior Tech Lead combined with the delivery speed of a fully tuned AI engineering workflow. Let’s build scalable solutions that help your business thrive!