Software Engineer — Hannover, Germany

I build tools that open 5GB files in 3 seconds.

High-performance native desktop applications for security professionals and data engineers. C++, ImGUI, simdjson. No Electron. No cloud. No compromise.

Stack C++ · ImGUI · simdjson
Focus Security Logs · Big Data Files
Trusted by OPSWAT Chief Scientist

"
When I'm going through reams of logs I prefer a delightful UX over the CLI and this tool filled that gap for me. I looked far and wide for a fast and beautiful app before having the pleasure of coming across this one.
Pedram Amini Chief Scientist at OPSWAT · Founder, Zero Day Initiative

columnlens
$ open suricata_2026-02-19.jsonl --file-size 5.2GB
12,847,293 rows parsed in 2.8s
Memory usage: 683MB
Rendering engine: ImGUI (native GPU)
Ready for analysis
Tools

What I'm building

Native desktop tools that handle files your current tools choke on. Every byte processed on your machine. Nothing leaves.

Shipped

ColumnLens

See through massive data files. Opens 5GB+ CSV, JSONL, Parquet, and gzip files with 12M+ rows in seconds. Advanced filtering, nested JSON flattening, and statistics panel.

5GB+ File size
12M+ Rows
6MB App size
In Development

PCAP Viewer

Fast, beautiful network traffic viewer for 2GB+ capture files. Same native engine, same buyer persona. For SOC teams who can't wait for Wireshark to load.

2GB+ Captures
Native Rendering
2026 Target

Technology

Why it's fast

No Electron. No JavaScript. No cloud roundtrips. Just compiled C++ running natively on your GPU.

C++

Compiled native code. No runtime overhead, no garbage collector, no V8 engine burning your RAM.

ImGUI

Immediate-mode GPU rendering. 60fps UI with zero DOM. Cross-platform from a single codebase.

simdjson

SIMD-accelerated JSON parsing. Processes gigabytes per second using CPU vector instructions.

Zero Cloud

100% on-device processing. Your security logs never leave your machine. No servers. No API bills.


About

Who I am

I'm Marc Hildmann, a software engineer based in Hannover, Germany. I build high-performance native tools for professionals who work with data that's too large for the tools everyone else uses.

By day, I run IoT Data Systems — a freelance engineering practice. By night, I'm building a suite of native desktop applications that security analysts and data engineers actually want to use.

I believe that professional tools should be fast, private, and beautiful. Not two out of three.


Try ColumnLens

Free for files up to 100MB. No account required. See what your data has been hiding.

Download Free or get in touch →