Backend Engineer
Building Scalable Systems

4+ years building high-performance backend systems with Go, Rust, and Python. Based in Jakarta, working with teams across US, Australia, and APAC.

Schedule a Call View Services
Latest Posts
Show All →

Astapa: One Stack for Auth, Subscriptions, and Billing

Stop wiring auth to billing separately. Astapa handles users, plans, and payments in one stack — so you can focus on building features that make money.

Read more →

Reload Configs On The Fly with Sidecar Agent

Discover how sidecar agents can revolutionize your application's configuration management. Learn the architecture patterns that enable hot-reloading without service disruption.

Read more →

I Love Backends!

A personal journey through backend development - from building reliable APIs to architecting scalable systems. Insights gained from real-world projects and continuous learning.

Read more →

About

I build backend systems that scale. From fintech payment processing to card issuing systems and e-commerce platforms handling 10k+ products, I focus on reliability, performance, and maintainability.

My journey: Bachelor's in Informatics from Del Institute of Technology (2022), then shipped features at Kredivo Group with Kafka-driven architectures, optimized e-commerce at Catalyst Tech, strengthened integrations at Tokopedia, and currently working on card issuing and transaction processing at StraitsX.

I also built Astapa — a platform that handles auth, subscriptions, and billing in one stack for indie developers and small teams. One JWT carries users, plans, and payment state so you can focus on features that make money.

Currently exploring Rust for high-performance systems. Based in Jakarta with US/APAC timezone overlap.

Experience

Backend Engineer

Feb 2026 - Present

StraitsX

  • Developing and maintaining card issuing systems for transaction processing and authorization flows
  • Working with ISO 8583 messaging standards and Visa specifications
  • ACS 3D Secure integration and reconciliation processes for transaction accuracy and compliance

Backend Engineer

May 2025 - Jan 2026

Kredivo Group

  • Event-driven architecture with Apache Kafka on dedicated ECS instances
  • Microservices communication using gRPC and REST APIs
  • Sub-millisecond database query optimization with Redis caching

Backend Engineer

Mar 2022 - Apr 2025

Catalyst Tech (voila.id)

  • 60% API performance improvement via GraphQL optimization
  • Concurrent processing for 10k+ products simultaneously
  • Real-time inventory with Redis pub/sub, ElasticSearch sync

Backend Engineer

Aug 2022 - Nov 2022

Tokopedia

  • Fraud prevention features and encrypted PII data sharing
  • Automated endpoint monitoring for partner integrations

Tech Stack

Go
Expert
Rust
Advanced
Python
Expert
Kotlin
Advanced
REST API
Expert
gRPC
Advanced
GraphQL
Expert
Redis
Expert
Kafka
Expert
PostgreSQL
Expert
MongoDB
Expert
ElasticSearch
Advanced
RabbitMQ
Advanced
NSQ
Advanced

Services

API Development

REST, GraphQL, and gRPC APIs built for scale and performance.

$45–60/hr

Microservices Architecture

Design and implement scalable microservices with Go, Python, or Rust.

$54–75/hr

Event-Driven Systems

Kafka, RabbitMQ, and NSQ implementations for real-time data processing.

$60–75/hr

Database Optimization

PostgreSQL, MongoDB, and Redis optimization for performance.

$45–60/hr

Search & Analytics

ElasticSearch implementation and data pipeline optimization.

$54–66/hr

Code Review & Consulting

Architecture reviews, performance audits, and technical consulting.

$36–54/hr

Monthly Retainer

For ongoing projects, I offer discounted monthly rates starting at $1,200/month for 20 hours/week.

Book Consultation

Contact

Email
apridosimarmata@gmail.com
Phone
+62-822-4938-4331
Location
Jakarta, Indonesia (UTC+7)