Product Engineering
End-to-end applications — React, Vue and React Native front-ends on Node.js, Express and NestJS services, backed by PostgreSQL or MongoDB. I design the data model, build the API, and ship the interface people actually use.
Open to new projects
Software Engineer Türkiye
Cem Altan
I build independent, human-centered systems — from the interface someone actually touches, down to the Linux server, database and mail stack running underneath it.
- 4+
- Years engineering
- Full-stack
- Interface to infrastructure
- 2
- Languages spoken
About
Engineering that holds up after launch day.
I'm a software engineer with more than four years of experience, and a Computer Engineering background. Most of my work sits in the same place: a product that has to be built, and the infrastructure it has to survive on.
That means I'm equally at home writing a React dashboard, modelling a PostgreSQL schema, hardening a Debian box behind a firewall, or getting a mail server to pass SPF, DKIM and DMARC so messages stop landing in spam. I've also spent time further down the stack — C and C++ on VoIP signalling and media, socket programming, and industrial protocols on autonomous vehicles — which is where I learned to read a packet capture instead of guessing.
What I care about is independence: systems the people who own them can actually run, understand and afford. I'd rather ship something small that a team can operate than something clever nobody can maintain.
What I Do
Four things I get asked for.
Most projects need more than one of these at once — which is usually why I end up on them.
Cloud & Infrastructure
The part most people would rather not own. Linux servers, Docker, firewalls and CI on GCP, AWS and Azure — plus Mailcow mail servers with SMTP relay and deliverability tuning, so mail actually lands in the inbox.
Systems & Protocols
Lower down the stack: C and C++ work on VoIP media and signalling, socket programming, and industrial protocols for autonomous vehicles. Comfortable in gdb when the abstraction leaks.
Access & Automation
Multi-tier IAM and access-control design — role hierarchies, permission policies, and the business-process automation around them. Translating what a business needs into something secure that engineers can build.
Selected Work
Projects I've designed and built.
An AI planning app I am building now, two platforms running in production for their clients, and a transaction engine that handles money splitting.
Ascendia
AI planning app
An AI planner that takes on the whole day rather than just the calendar. A conversational coach works across connected spaces for planning, training, nutrition, focus, money and notes — proposing a week, reshaping it when the day slips, and explaining its reasoning instead of only showing numbers. I designed and built it end to end: the React Native app, the microservice backend, and the cloud it runs on.
- Conversational AI coach with persistent memory
- 14 Node.js services behind a single API gateway
- Streaming agent orchestrator driving tool calls
- Planning, training, nutrition, focus and money in one app
Coming soon to App Store Coming soon to Google Play
Currently in development — coming to both stores.
- React Native
- Expo
- TypeScript
- Node.js
- PostgreSQL
- Redis
- Docker
- Google Cloud
TUSinspire
Education & coaching platform
A full coaching platform for a company preparing medical graduates for Turkey's TUS and DUS specialisation exams. It replaced a manual, spreadsheet-driven operation with personalised study plans, progress tracking, in-app messaging and digital contract signing — automating roughly 70% of the client's core business processes.
- Separate admin and student dashboards
- Personalised study plans and progress tracking
- In-app messaging and digital contract signing
- ~70% of core processes automated
- React
- Node.js
- PostgreSQL
- Google Cloud
Aliağa Jeotermal Enerji
Corporate site & content platform
A bilingual corporate platform for a geothermal energy and water-engineering firm, covering their services, project portfolio and news. More than a brochure site: it carries a quote-request pipeline, member accounts with email verification, and an admin panel the client uses to publish projects and articles themselves — plus the KVKK/GDPR, privacy and cookie pages a Turkish company needs.
- Turkish and English throughout, via i18n routing
- Client-managed projects, news and articles
- Quote requests with account registration and email verification
- KVKK / GDPR, privacy, cookie and terms coverage
- React
- Vite
- i18next
- Node.js
- Admin CMS
Real Estate Transaction API
Transaction & commission engine
A NestJS backend managing the full lifecycle of a property deal — agreement, earnest money, title deed, completion — as a strictly sequential state machine. Handles automated commission splits across single-agent, dual-agent and pro-rata multi-contributor scenarios, with JWT role-based access for admins, consultants and external API clients.
- Sequential transaction state machine
- Automated pro-rata commission distribution
- JWT role-based access + external API clients
- Admin dashboard for payouts and monitoring
Toolkit
The stack I actually work in.
Not a wish list — these are the tools I have shipped and operated production systems with.
Languages
- TypeScript
- JavaScript
- C
- C++
- SQL
- HTML / CSS
Frameworks & Runtime
- Node.js
- Express.js
- NestJS
- React
- React Native
- Vue
- Astro
Data
- PostgreSQL
- MySQL
- MongoDB
- Mongoose
- Redis
Cloud & DevOps
- Google Cloud
- AWS
- Azure
- Docker
- Linux / Debian
- Caddy / Nginx
- Cloud Firewall
Infrastructure & Mail
- Mailcow
- SMTP Relay
- AWS SES
- Deliverability (SPF / DKIM / DMARC)
- TLS / Let's Encrypt
Protocols & Systems
- SIP
- RTP
- WS / WSS
- TCP / UDP
- Modbus
- Ethernet/IP
- gdb
- Sockets
Security & Analysis
- IAM
- Access Control Design
- Role Modelling
- Process Automation
- Stakeholder Management
Workflow
- Git
- Jest
- Swagger / OpenAPI
- Agile / Scrum
- AI-assisted Development
- Prompt Engineering
Contact
Got something you want built?
Whether it is a product from scratch, an infrastructure problem, or a mail server that refuses to behave — tell me what you are working on and I will tell you honestly whether I am the right person for it.