// SYSTEM.INIT

High-Performance
Backend Engineering

Tomasz Kolaj

Distributed systems, Go, Kubernetes, and AI platform engineering. 20+ years building production systems that handle hundreds of thousands of requests per second.

$ init --project →
LinkedIn GitHub Gdansk, Poland
SCROLL
// 001 — WHO I AM

Code Is My Craft

KolajFX is a one-person backend engineering practice with 20+ years of hands-on experience designing and implementing high-volume, low-latency systems. I specialize in turning complex distributed architectures into clean, scalable, production-grade software.

From decomposing monoliths into microservices to building real-time data pipelines processing hundreds of thousands of events per second — I've done it at scale, across cybersecurity, ad-tech, email platforms, and AI.

One engineer. Senior-level depth. Zero overhead.

kolajfx.sh
$ cat profile.json
{
"name": "KolajFX",
"type": "Backend Engineering Practice",
"core": ["Distributed Systems", "Microservices"],
"languages": ["Go", "C++", "TypeScript", "Python"],
"infra": ["Kubernetes", "AWS", "Kafka"],
"philosophy": "Ship clean, ship fast",
"experience": "20+ years"
}
$ _
0REQ/SEC HANDLED
0YEARS IN THE GAME
0INDUSTRIES SERVED
<60msRTB LATENCY
// 002 — TRACK RECORD

Battle-Tested Across Industries

AI

Artificial Intelligence

Nexos.AI

Building intelligent systems and ML-driven platforms that power next-generation AI products and automation workflows.

ML PIPELINES AI PLATFORMS AUTOMATION
VPN

Cybersecurity & Privacy

NordVPN

Redesigned API gateways serving millions of client devices across desktop, mobile, and IoT. Migrated critical infrastructure from legacy stacks to Go on Kubernetes.

100-300K RPS API GATEWAY K8S MIGRATION
RTB

Ad-Tech & Real-Time Bidding

MediaMath

Decomposed monolithic platforms into microservices handling 100-500k events/sec. Architected real-time bidding systems with sub-60ms latency.

HIGH-THROUGHPUT KAFKA CLICKHOUSE
@

Email & Marketing Platforms

GetResponse

Engineered backends powering hundreds of millions of emails daily. Led migration from legacy Perl to Go with event-driven architectures.

EVENT-DRIVEN RABBITMQ SCALE
DRM

Digital Media & Content Security

NeuLion · Saffron Digital

Implemented secure DRM licensing systems with multi-level AES encryption for major entertainment partners. Built adaptive streaming and content delivery platforms.

PLAYREADY AES STREAMING
NET

Network Infrastructure

ABP Computer

Designed network management services, CRM solutions, and infrastructure automation from the ground up. Full-stack system architecture and DevOps.

SYSARCH DEVOPS CRM
// 003 — WHAT I DO

Areas of Expertise

</>

Distributed Systems & Microservices

Decomposing monoliths, designing event-driven architectures, and building systems that handle hundreds of thousands of requests per second with rock-solid reliability.

ARCHITECT
Go

Go Engineering & Migration

Deep Go expertise for high-performance backends. I migrate legacy systems (PHP, Perl, Python) to Go and mentor teams through the transition.

BUILD
K8

Cloud & Kubernetes

From on-prem to cloud-native. Kubernetes orchestration, AWS infrastructure, CI/CD pipelines, and container strategies that cut costs and accelerate deployments.

DEPLOY
AI

AI & Data Pipelines

Real-time data streaming, ML pipeline infrastructure, and intelligent automation. I leverage AI-assisted development tools to accelerate delivery without compromising quality.

AUTOMATE
Rx

Legacy Modernization

Strangling monoliths, replacing legacy protocols, and migrating to modern stacks. I've taken UDP-based architectures to Kafka + K8s without downtime.

MODERNIZE
TL

Tech Leadership & Mentoring

RFC-driven architecture decisions, code reviews, and hands-on mentoring. I help engineering teams level up and ship with confidence.

LEAD
// 004 — TECH STACK

My Toolbox

kolajfx ~ stack
$ cat /etc/kolajfx/stack.conf
// 005 — CONTACT

Get in Touch

contact@kolajfx ~ init-project
$ name
$ mail
$ type
$ msg