01
Web & mobile apps
MVPs and production apps, from the first screen to deploy.
- Product scoping & user flows
- Web and mobile front ends
- APIs, databases, auth, payments
- CI/CD, hosting, monitoring
React · Next.js · Flutter · FastAPI · Hono · PostgreSQL
Product engineer · open for freelance & contract
I turn ideas into shipped software — web, mobile and AI.
I’m Tsaqif Mukhayyar, a product engineer in Surabaya. I help founders and teams go from an idea to a product people use — scoped, built and shipped by one engineer, down to the firmware when it touches hardware.
Shipped01 / 05
- CanSat Competition
- 3rd ×2
- AAS CanSat Competition USA, ’23 & ’26
- Legacy rebuild
- −90%
- Page load (LCP) after a legacy rebuild
- Device fleet
- 45 → 5 min
- OTA rollout per edge device
- Research
- IEEE ’26
- Paper on edge computer vision
(01)What I doRemote · UTC+7
What I can build for you.
02
AI features
AI that does real work inside your product — measured, not just demoed.
- Chat and search over your data
- Plain-language analytics (NL → SQL → charts)
- Document and data extraction
- Computer vision on the device
LLMs · tool calling · RAG · CLIP · Python
03
Modernize & scale
Legacy apps rebuilt on a modern stack — faster, and easier to change.
- Step-by-step rewrites, no big bang
- Performance work (LCP −90% on a defense app)
- Docker, CI/CD and OTA for device fleets
- Reliability and cloud costs
Docker · GitHub Actions · Cloudflare · GCP · AWS
(02)How I workFour steps
From first call to launch.
- 01
Intro call
Free, 30 minutes. We talk about the problem and the people it’s for, not the stack. You leave with a clear next step — even if it isn’t me.
- 02
Plan
A short written plan: what we build first, the milestones and a price. You know what you’re getting before any code.
- 03
Build
Weekly demos you can click, code in your repository from day one, and written updates so nothing waits on a meeting.
- 04
Launch
Deployed to production with docs and a handover call. I stay reachable for fixes and the next version.
(03)Selected workIndustry · research · my own products
Proof, not promises.
Hover a part · click to run checks · drag to tilt
My product · now building
rekafab
Describe it. Get a board you can order.
A PCB design studio in the browser: describe a board and get the schematic, the layout and the checks a fab runs — then Gerbers, a BOM, firmware and an enclosure. Designed, built and shipped end to end.
Open rekafab- PKM Explorer ↗
Data product for students
23,000+ funded PKM titles from 9 years — search, rankings and a map of 900+ campuses, all running in the browser.
React · SQLite WASM · Leaflet - OptiControl
Industrial inspection software
9+ ultrasonic inspection modes, a network call every 3 ms, offline licensing.
Python · PySide6 · PyQtGraph - Petruck.id
AI analytics
Ask in plain language, get SQL and live charts — no report templates.
LLMs · dynamic SQL · Plotly - Infoglobal
Defense legacy modernization
Page load (LCP) cut by 90%; API latency −20% on an async FastAPI backend.
FastAPI · React · Zustand - Research · IEEE GCCE ’26
Edge computer vision
Scene-aware detection on a Raspberry Pi 5; context switch 15 s → 300 ms, no cloud.
Python · CLIP · Docker · ARM64 - EEPISAT
Flight firmware & ground station
3rd at the AAS CanSat Competition (USA) in ’23 and ’26; a 4 km radio link on a $15 antenna.
C++ · Teensy · XBee · Flutter
Every project, the flight log and the full story — about me →
(04)PricingUSD · starting prices
Clear starting prices.
Consult call
$100/ session
An hour on your stack, architecture, a vendor quote or a build-vs-buy decision.
- 60-minute video call
- Written notes and a recommendation
- Follow-up questions by email
AI feature
from$1,500
One AI capability in a product you already run — chat over your data, NL → SQL analytics, extraction or on-device vision.
- A working prototype first
- An evaluation set, so quality is measured
- Deployed into your stack
Founders start here
MVP build
from$3,000
From idea to a launched v1 in 4–8 weeks: web or mobile app, API, database, auth and admin.
- Scope and a clickable flow before code
- Weekly demos you can try
- Deployed, documented, handed over
Part-time engineer
from$1,500/ month
Me on your team, part-time: features, fixes, code review and infrastructure.
- A set number of hours each month
- In your repo, chat and stand-ups
- Month to month
Something else? Fixed-scope projects, team augmentation, hardware + software builds — let’s talk.
Prices in USD, excluding third-party costs (hosting, APIs, hardware). Every project starts with a free 30-minute intro call.
(05)FAQStill unsure? Ask me
Questions people usually ask.
What kind of projects are a good fit?
New products that need to reach users fast, AI features for products already in use, and older apps that need a modern stack. If the product touches hardware — sensors, devices, radios — even better.
How do we start?
Book a free 30-minute intro call. If it’s a fit, you get a short written plan with scope, milestones and a price. Work starts when you approve it.
How does pricing work?
The prices above are starting points. Fixed-scope work gets a fixed quote after the intro call; ongoing work is billed monthly. Prices are in USD and exclude third-party costs such as hosting and APIs.
You’re in Indonesia — how does remote work go?
I work from Surabaya (UTC+7) with clients anywhere. My day overlaps with Asia and Australia, and with Europe in the afternoon. Updates are written, so nothing waits on a meeting.
Who owns the code?
You do. The code lives in your repository from day one, and everything built for you is yours once it’s paid for. Happy to sign an NDA before we talk details.
Can you also do the hardware side?
Yes. I’ve written flight firmware for CanSats and rockets, built ground stations and a 4 km radio link, and run computer vision on a Raspberry Pi. I also build rekafab, a PCB design studio in the browser.
The long version
Want to know me first?
The flight log from 2019 to now, every role, an interactive antenna figure, projects, awards and writing — all on one page.
Read about me