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riorhezaharris/README.md

Rio Rheza Harris

Senior Backend Engineer & AI Engineer. 5y fintech (Jack & Transfez). Payment systems, distributed backend, RAG/LangGraph AI in prod. Jakarta, open to remote.

What's in this profile

Nine repos, one theme: production-grade distributed systems, built and proven — not described.

Data consistency — CAP theorem, both sides

Repo Model Demonstrates
bank-ledger CP 3-node quorum replication, two-phase commit, live partition simulation, double-entry accounting
todo-list AP CRDTs, vector clocks, OR-Sets — offline-first writes that merge deterministically on reconnect

Production reliability

Repo Focus
payment-gateway-webhook Automated Postgres failover (Patroni/etcd) — zero data loss when the primary crashes mid-stream
rate-limiter 4 algorithms compared head-to-head, including a live demo of a real boundary-exploitation flaw and its fix
load-balancer 5 hot-swappable routing strategies, live admin API, EWMA latency tracking

Every repo ships with a working demo, a README that explains the why behind each design decision, and ADRs documenting the tradeoffs. Full list (including circuit-breaker, automated-log-archiver, behavioral-tracker, weather-app) in Repositories.

Background

Pivoted into software from aerospace engineering after COVID collapsed the sector — five years at Jack & Transfez since, an Indonesian fintech backed by Y Combinator and East Ventures.

Backend work there: payment verification pipelines under financial compliance, a decoupled Marketing Engine that cut infrastructure cost by 150M IDR/year, QA automation saving 500+ engineer-hours/month, production error rates held at B2B <10% / B2C <1%.

Most recently: Hybrid Search and RAG pipelines in production, LangGraph agentic workflows, N8N/MCP integrations for internal automation.

Stack

Go · TypeScript · Python · PostgreSQL · Redis · Elasticsearch · Docker · RabbitMQ · GCP

Elsewhere

LinkedIn · riorhezaharris@gmail.com · Jakarta, Indonesia — open to international remote roles

Pinned Loading

  1. bank-ledger bank-ledger Public

    Distributed bank ledger demonstrating CP (CAP theorem) — 3-node quorum replication, two-phase commit, partition detection & auto-resync, double-entry accounting

    Go

  2. todo-list todo-list Public

    Collaborative todo app demonstrating AP (CAP theorem) — CRDTs, vector clocks, OR-Sets, automatic conflict-free merge after network partitions

    Go

  3. payment-gateway-webhook payment-gateway-webhook Public

    HA payment webhook system in Go — Patroni/etcd automated Postgres failover, HAProxy transparent DB routing, zero data loss during primary crash. Stripe-style idempotent ingestion

    Go

  4. rate-limiter rate-limiter Public

    Production-grade HTTP rate limiter in Go — 4 algorithms (Token Bucket, Leaky Bucket, Fixed/Sliding Window) benchmarked side-by-side, including a live demo of Fixed Window's boundary exploitation

    Go

  5. load-balancer load-balancer Public

    Reverse proxy load balancer in Go with 5 hot-swappable routing strategies, active health checks, and EWMA latency tracking

    Go