system status: operational — Ankara, Türkiye

Mustafa Culban

$

I build scalable B2B SaaS platforms with a strong focus on backend architecture, security, and cloud infrastructure. I enjoy owning critical systems end-to-end and turning complex requirements into reliable production software.

Mustafa Culban — profile photo
mustafa.jpg
8+
years shipping SaaS
400K+
daily active users served
20TB
traffic in one broadcast
6
engineers hired & mentored
availability.status
200 OK

Open to the right system

  • Available for remote work
  • Relocating to Germany upon Chancenkarte approval
  • Open to Netherlands & Austria with sponsorship

based in: Ankara, Türkiye

mustafa@culban — zsh
$ try:

How I engineer

// principles.md
01

Own it end-to-end

Design → implementation → rollout → iteration. Systems are only done when they survive production, and then only until the next incident.

02

Security is a feature

2FA for 400K users, OAuth2 migrations, SOC 2 and GDPR compliance. Trust is the real product; everything else is UI.

03

Measure, then brag

Latency from 400ms to 250ms. Account takeovers down 15%. First-touch time down 25%. If it is not measured, it did not happen.

04

People scale systems

Five direct reports, 30+ technical interviews, 24 interns mentored. The best architecture decision is often a hiring decision.

contribution.log

GitHub activity

fetching...
$ fetch contributions --year last

Career, version-controlled

// career.git
career.git
➜ career git log --oneline --graph
* f7c2026 (HEAD -> main, tag: v2026) status: open to senior backend/full-stack roles — remote · DE · NL · AT
* e91a5d3 chore(jotform): hand over 400K-DAU systems after 7+ years — 2026-05
| * c8b41f2 (devjoys) feat(jurispy): AI verdicts live — web + App Store
| * a730e9c feat(dronefleethq): 8 paying customers · ~$240 MRR
| * 94d2c1b feat(tande): launch on the iOS App Store
| * 81f6a4e init(devjoys): one-person AI product studio — 2024-01
|/
* 7325bd9 feat(smtp): OAuth2 modernization — zero-downtime rollout
* 6ab90e4 feat(growth): CRM analyzing 15–20M users — first-touch time -25%
* 58c17df feat(auth): 2FA for 400,000 daily users — SOC 2 & GDPR
* 4f02b8a chore(team): hire 6 engineers · mentor 24 interns
* 3d91c56 feat(jotform): join as senior engineer → team lead — 2019-01
* 2c80ea7 feat(anvato): 20TB Super Bowl live-stream window — 2018
* 1b7f9d3 init: B.S. Computer Science @ Bilkent University — 2013

Selected work

GET /projects →
Enterprise Two-Factor Authentication screenshot
case-study200 OK · 400K DAU

Enterprise Two-Factor Authentication

Designed and implemented a scalable 2FA platform serving 300K–400K daily active users across Jotform’s enterprise and consumer products.

PHPRedisMySQLTOTPDomain-Driven Design

Technical focus

// stack.config

Backend & PHP

PHP 7.x/8.xSlimCustom FrameworksOOP · SOLID · PSRDesign PatternsDependency InjectionREST APIsOAuth2Domain-Driven Design

Architecture & Data

MicroservicesModular MonolithsEvent-Driven ArchitectureKafkaRabbitMQGearmanMySQLPostgreSQLRedisElasticsearchRate LimitingCachingSQL Optimization

Frontend, Cloud & DevOps

TypeScriptReactReact NativeNode.jsDockerAWS · S3 · Lambda · RDS · CloudFrontGCP · Cloud Run · Pub/SubJenkinsGitHub ActionsCI/CD

Testing & Observability

PHPUnitJestSeleniumIntegration & E2E TestingELK · KibanaCloudWatchDatadogSentryFeature FlagsCanary Rollouts

AI Engineering

LLMsRAGPrompt EngineeringLLM IntegrationAI AgentsOpenAI APIClaude API