Specialized in Software Engineering
Production-ready web applications.
React/Next.js • Backend APIs • Database Design • Fullstack
ByteDance
DataIns
Gadjah Mada Aerospace
PetaData
PPSMB
Robota
Semesta Data Digital
Telkom Indonesia
Tilikan
TokopediaFeatured Work
AI products, SaaS, and platforms I've shipped for real clients
More Projects
Award-winning competition builds and other client work
Tech Stack
Tools I reach for to ship scalable, production-ready applications.
- React
- Next.js
- TypeScript
- JavaScript
- Tailwind CSS
- Vue.js
- Node.js
- Express.js
- Python
- FastAPI
- Java
- REST API
- PostgreSQL
- MySQL
- MongoDB
- Redis
- Prisma
- Supabase
- Docker
- AWS
- Vercel
- GitHub Actions
- Git
- Linux
About
I'm Haikal Hilmi, a freelance data & software engineer. I build large-scale scraping systems and data pipelines, ship full-stack products for clients, and operate HPC infrastructure. Backend Engineer intern at ByteDance (100k+ RPS), 5.0★ on Upwork, and multiple international hackathon wins. I do my best work on long-term engagements where I can own systems end to end.
Experience
Roles where I've owned systems, led teams, and shipped at scale.
ByteDance
Feb 2025 – Jun 2025Built a microservice handling 100,000+ requests/second.
Backend Engineer · Intern · Yogyakarta, ID
Contributed to Tokopedia × TikTok-Shop system integrations.
- Go
- gRPC
- RocketMQ
- NSQ
- Bytecloud
Engineering Research & Innovation Center, FT UGM
Jul 2025 – Jan 2026Ran UGM Career Summit for 2,800+ concurrent users with zero downtime.
Full Stack Software Engineer · Yogyakarta, ID
- Next.js
- React
- TypeScript
- Supabase
Semesta Data Digital
Jan 2024 – Nov 2025Designed HPC data pipelines — reliability +25%, processing time −40%.
Data Engineer · Contract · Jakarta, ID
Operated an 8-server HPC cluster ingesting social-media & news data at scale.
- Python
- Elasticsearch
- PostgreSQL
- RabbitMQ
- Docker
- Grafana
Tilikan Indonesia
Sep 2023 – Mar 2024Analytics dashboards — reliability +50%, cross-team efficiency +70%.
Web App Developer · Contract · Yogyakarta, ID
- Next.js 14
- React
- TypeScript
- MongoDB
Global Data Inspirasi
Jan 2023 – Jan 2024Led a team building real-time data dashboards and reusable components.
Web App Developer · Contract · Yogyakarta, ID
- Next.js 13
- React
- TypeScript
- TanStack
Telkom Indonesia
Jan 2024 – Mar 2024Penetration-tested critical web platforms and hardened their security.
Datacomm Product Dev · Intern · Jakarta, ID
- Python
- SD-WAN
- Tableau
How I Work
Straightforward collaboration, built for results.
Engagement
Fixed-price or hourly—whatever fits the project. Open to long-term collaboration.
Communication
Clear, responsive updates throughout the project—no surprises.
Process
Understand the goal, propose the approach, then build and iterate to delivery.
Ownership
I can own a system end-to-end—from tech selection to production.
What clients say
Trusted by teams and organizations to deliver.
“As commissioner of Semesta Data Digital and Global Data Inspirasi, I've seen first-hand how Haikal designs data infrastructure, runs large-scale pipelines and scraping with high reliability, and helped shape products like Robota. He was also my teaching assistant for a year—consistent, a fast learner, and highly dependable. He combines genuine technical depth with a strong sense of ownership.”
“As Director of PT Aksarakan Bhumi Indonesia, I deeply appreciate his work—he not only built the company's website and digital infrastructure, but also drafted our IT security SOPs and actively took part in negotiations with strategic clients, showing a remarkable combination of technical skill, leadership, and business sense.”
“I had the pleasure of working with Haikal on a scraping project, and he exceeded my expectations in every aspect. Professional, responsive, and highly skilled, delivering high-quality work on time. I highly recommend Haikal—he's a fantastic contractor.”
Jeesun Kim
Upwork client · Twitter/X Scraper
Aurora, Canada
“Haikal is very smart, creative and good at what he does. He is a great communicator and very efficient.”
Claire Bartolozzi
Upwork client · Tweet Collector
South Yarra, Australia
“Haikal was very quick to respond and professional in his work. He even suggested some improvements to the deliverables, which I found useful. I would definitely work with him again.”
Cristian Buda
Upwork client · PDF→JSON Extraction
Cluj-Napoca, Romania
Need data work too?
Beyond apps, I build reliable data pipelines, web scrapers, and ETL systems that keep your data clean and ready to use.
See my data engineering work