Wahyu

Backend Engineer

I build production-grade backend systems

Backend engineer with 7+ years of experience building and independently owning production systems, from real-time trading platforms to cross-chain fintech and AI content infrastructure.

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7yBackend

SoleMaintainer

99.5%Uptime

Mainly

Sole

Maintainer

Uptime Achieved

Years Experience

Mainly Go and Node.js (NestJS), PostgreSQL and Redis, on GCP.

What I Build

Problem domains I've shipped systems for

Cross-chain coordination

Distributed state across networks with idempotent transfers.

Cross-chain fund transfers across multiple networks with different finality guarantees, using messaging bridges and idempotent transfer flows.

WormholeCCTPEVMAptos

Real-time trading systems

Atomic orders and sub-second pipelines.

Atomic order flow, live leaderboards, and sub-second pipelines built on WebSocket connections and Redis-backed ranking.

WebSocketBullMQRedisPostgreSQL

Regulated identity flows

KYC and onboarding with FAPI-grade security.

High-assurance KYC and onboarding following financial-grade API security profiles for government identity systems.

SingpassFAPI 2.0PARDPoP

Event-driven pipelines

Idempotent queues with failover and real-time sync.

Distributed queues with idempotent processing, multi-provider failover, and near real-time data sync.

BullMQKafkaMongoDBMulti-AI

Featured Projects

Backend systems I've built

View all

Microjob marketplace platform, freelancer-style, focused on small tasks. Built in Go with Gin and JSON-RPC architecture for strongly-typed service contracts, backed by PostgreSQL for transactional consistency and Redis for caching and queue coordination. Integrated Singapore's Singpass/Myinfo under the FAPI 2.0 security profile (PAR and DPoP), enabling onboarding with government-verified identity data.

GoGinPostgreSQLRedisJSON-RPCSingpassFAPI 2.0

Music fintech platform with cross-chain fund transfers across 5 EVM networks with different finality guarantees. Designed transfer architecture using Wormhole messaging and Circle CCTP burn-and-mint for native USDC, with recovery paths for failed transfers. Reduced RPC latency by ~70% through parallel execution and connection pooling, and designed an event-driven distributed queue with idempotent processing.

Node.jsNestJSPostgreSQLRedisWormholeCCTP

Real-time trading platform with atomic transactions and zero-downtime deployments. Identified direct RPC calls as a cost bottleneck for blockchain indexing, replaced with Aptos Processor, reducing costs by 100x+. Tackled leaderboard latency by building real-time ranking system with BullMQ, PostgreSQL, and Redis caching.

Node.jsPostgreSQLRedisBullMQWebSocket

Active build

Marketplace

Silverhands

Microjob marketplace in Go with Gin and JSON-RPC. Integrated Singpass national identity following FAPI 2.0 security profile.

GoGinPostgreSQLRedisJSON-RPCSingpassFAPI 2.0

5 networks

Fintech

Opulous

Music fintech platform with cross-chain fund transfers across 5 EVM networks with different finality guarantees, using Wormhole and Circle CCTP.

Node.jsNestJSPostgreSQLRedisWormholeCCTP

100x+ cost reduction

Trading

Booster

Real-time trading platform with atomic transactions, Aptos blockchain indexing, and real-time ranking system.

Node.jsPostgreSQLRedisBullMQWebSocket

Work Experience

My journey in backend engineering

Sole backend engineer owning all server-side infrastructure across Opulous, Booster, NFT Springboard, and Silverhands.

Cross-chain USDC transfers across 5 EVM networks (Wormhole, CCTP)

Reduced response time ~70% via parallel execution + pooling

Distributed queue with idempotent processing + integration tests

Real-time leaderboard via BullMQ + PostgreSQL + Redis

Sole on-call; first responder for production incidents

Owned backend architecture for campaign management platform serving 10,000+ monthly active users.

MySQL indexing + Redis cache: ~35% faster queries, 3x capacity

GCP infra (Cloud Run, Cloud SQL) with CI/CD pipelines

99.5% uptime across production services

Built diverse production systems across multiple industries in Jakarta, Bandung, and Malaysia.

Employee dashboards (Node.js, React, MSSQL)

Live sports score apps (.NET, Redis, WebSocket)

Vending machine payments (Java, Spring Boot, Kafka)

Full-stack solutions across client engagements

Backend Engineer

Remote

Undercurrent Technologies

Jan 2023 - Present

Sole backend engineer owning all server-side infrastructure across Opulous, Booster, NFT Springboard, and Silverhands.

Key Achievements

Designed and implemented cross-chain fund transfers across 5 EVM networks with different finality guarantees, using Wormhole messaging and Circle CCTP burn-and-mint for native USDC transfers, with recovery paths for failed transfers

Diagnosed sequential RPC calls as primary latency bottleneck, refactored to parallel execution with Promise.allSettled and connection pooling, reducing response time by ~70%

Identified reliability risks in async transfer flows, designed event-driven distributed queue with idempotent processing to prevent duplicate transactions, backed by integration test coverage

Tackled leaderboard latency by building real-time ranking system with BullMQ, PostgreSQL, and Redis caching

Sole on-call for backend across all products; first responder for production incidents, triaging from logs to root cause

Let's build together

Need a reliable backend for your project? I'm available for freelance work and new opportunities.

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Open to senior backend roles·Remote-first, based in Indonesia·Replies within 24h

Wahyu

I build production-grade backend systems