Description: Blockchain explorer platform providing real-time transaction indexing, wallet tracking, and on-chain analytics for a Social-Fi ecosystem. Part-time contribution to the same outsourcing corporation listed below.

Technologies: Golang, PostgreSQL, Redis, Kafka, WebSockets, gRPC/JSON-RPC

Responsibilities:

• Data Pipeline (Indexer): Built high-performance Golang indexer with Worker Pool & Binary Retry, processing parallel transactions with block-level error isolation.
• Storage Layer Optimization: Optimized PostgreSQL using Batch Inserts and limited connection pooling to prevent deadlocks under high write loads.
• High-Concurrency Handling: Resolved race conditions for concurrent Lucky Money feature using Redis Lua Scripts to ensure high-concurrency atomic operations.

Description: B2B SaaS compliance platform for startups and service providers.

Technologies: Next.js (SSR), Express.js, MongoDB (Atomic Ops), GitHub Actions, Cloud Run, Cloud SQL

Responsibilities:

• SaaS Multitenancy: Migrated architecture to a Multitenancy SaaS model enabling single accounts to manage multiple tenants, boosting scalability.
• Auth & Security: Led the complete refactoring and rewrite of the end-to-end authentication flow, integrating Next.js SSR with an Express backend, resolve multi-tab token race conditions.
• Transaction Integrity: Engineered credit deduction using MongoDB atomic updates and Idempotency Key pattern, eliminating double-deductions during concurrent mid-request crashes.
• Invoicing Sub-module: Built serverless financial reporting on Cloud Run/Cloud SQL with automated CI/CD.
• Leadership & Mentoring: Mentored 2 junior engineers through pair programming on OAuth patterns, multitenant workflows, MongoDB atomic ops, and Clean Architecture.

Description: Multi-platform property management SaaS connecting agencies, landlords, and tenants.

Technologies: AWS EC2, Node.js/TypeScript, PostgreSQL (Advanced Indexing), Redis, Sequelize, Google OAuth2, Twilio, SendGrid, React Native

Responsibilities:

• Optimization & Database Tuning: Optimized queries on 2.8M-row tables via denormalization and Covering Indexes, reducing API latency from 30s+ to 187ms and RAM usage by 97%.
• Advanced Caching Architecture: Designed distributed caching (Tiered Cache, Sliding Window) via Redis with distributed locks to prevent stampedes and optimize data retrieval.
• Real-time & Data Sync: Built real-time chat statuses via SendGrid Webhooks and bi-directional Rent Manager data sync.

Description: A scalable management platform designed for marketing companies to optimize the field-sales acquisition process.

Technologies: Microservices, NodeJS, NestJS, ReactJS, React Native, Docker, Kubernetes, Gitlab, MinIO, Redis, Kafka, Socket, Postgres, Keycloak

Responsibilities:

• Microservices Foundation: Architected and launched 3 core microservices (Auth, Acquisition, Invoice) to lay the platform foundations.
• Custom Authorization: Integrated Keycloak OIDC and built Redis-cached Auth Service to centrally enforce hierarchical RBAC and granular PBAC across all field sales workflows.
• Dynamic Invoicing Engine: Engineered 5-phase event-driven invoicing engine, automating payroll reconciliation from 5 days to <10 minutes with 100% accuracy.

• EventX (Jan 2022 – Jun 2022): NFC-enabled event management system. Maintained RESTful APIs and resolved critical bugs for live event operations. (Technologies: Microservices, Kubernetes, GCP, NodeJS, ReactJS)
• Trailer Rental Platform (Oct 2021 – Jan 2022): Trailer rental management SaaS. Built dynamic pricing engine converting Excel-based fee calculations into automated Stripe subscriptions. (Technologies: AWS, ReactJS, NestJS, Stripe)