I build the systems between a GPS device and the screen that shows where a vehicle is. At Markon I write the TCP listeners and protocol parsers that take raw bytes off thousands of trackers and dashcams, the live video pipelines behind them, and the portals the support and operations teams use every day. I work mainly in Node.js and Python.
Everything below is in production. Grouped by the part of the tracking stack it sits in, from the device socket up to the customer-facing portals.
Raw TCP, binary frames, vendor PDFs.
High-concurrency TCP listeners that accept tracker connections, decode each vendor's packet format and forward clean location data to the tracking platform.
Parser and integration for BSJ GPS terminals, bringing their login, heartbeat and location packets into the same pipeline as the rest of the fleet.
A web tool for the support team that decodes large batches of raw packets across every protocol we run.
A 24×7 relay that sits between devices and destination servers, forwarding traffic both ways. Replaced a single-device desktop tool.
Dashcam live streams and playback.
Full JT/T808 (2011 and 2019) and JT/T1078 server for Jimi IoT JC371 dashcams.
Parser and live-stream integration for Concox/Jimi JC261 dashcams, so customers can watch the road camera from the tracking platform.
Tools the team and customers use daily.
Moved vehicle-tracking support off phone calls, WhatsApp and email into one ticket desk.
Master inventory for devices and SIMs: IMEI, ICCID, eSIM profiles and which party each unit went to, with bulk import.
Billing system for the tracking business, covering device and service invoicing for customers.
A self-service guide for common device and app problems, with a chatbot that walks customers to the right fix before they need to raise a ticket.
The company website for Markon: products, services and the entry point to the tracking and support portals.
From socket-level byte parsing to the servers it all runs on.