Financial Infrastructure
Building robust fintech backends for cards, wallets, payments and money movement at scale.
Complex. Critical. Reliable.
Hi, I'm
Serdar
Doğrubakar.
I build systems, products and brands using technology, experience and relentless curiosity.
From financial infrastructure and data-intensive platforms to autonomous agents, digital products and children's stories, I turn complex problems into real things that work. I build systems that collect, process and analyze data at scale, create products from ideas, and use AI where it makes the work smarter, faster and better.
ENGINEER
BUILDER
PROBLEM SOLVER
AI-NATIVE
I don't just write code.
I build systems that matter.
I build systems that matter.
What drives me
Systems that scale. Products people love.
Ideas that make life a little better.
I enjoy the process of turning chaos into clarity
and shipping things that create real impact.
20+
Years of
Experience
Experience
50+
Major Systems
Built
Built
∞
Curiosity &
Learning
Learning
Global
Mindset
Mindset
What I Build
Data Into Intelligence
Turning fragmented crypto data into structured information and actionable insights.
Observe. Analyze. Act.
Children's Story Brand
Creating stories and products that help children understand feelings and grow.
Little stories. Big feelings.
AI-Native Systems
From autonomous agents to multi-agent workflows and local AI tools that get things done.
Automate. Augment. Accelerate.
Digital Products
Designing and building digital products, tools and platforms that solve real problems.
Useful. Usable. Loved.
AI Is My Co-Pilot
I use the right model for the right job. Every day.
✳
Claude
Primary for CodingMy main coding partner. Planning, architecture, refactoring, debugging and deep code review.
◍
ChatGPT
Research, ideation, content generation, problem solving and fast iteration.
⌬
OpenAI (API)
Powering tools, agents and automations behind the scenes.
✦
Gemini
Long context, analysis, multimodal understanding and cross-checking.
⬡
Codex
Code generation, automation and large scale refactoring.
▣
Local Models
Privacy-first tasks, experimentation and offline AI workflows.
HOW I USE AI
Research & Discovery
→
Spec & Plan with AI
→
Build & Iterate with AI
→
Test & Validate with AI
→
Document & Ship with AI
AI doesn't replace my thinking.
It multiplies my output.
It multiplies my output.
Open Source
Tools I ship in public. No API keys, no lock-in.
Connects native coding-agent sessions across Claude Code, Codex, Grok and
Antigravity. Each agent keeps its own real session — the bridge carries over
only the context the other one is missing. One command: /bridge codex.
Drives the subscription CLIs you already have.
A Claude Code plugin that runs your own agent on other model CLIs
(grok, codex, claude) as independent reviewers.
Deterministic multi-round adversarial arena with a code-grounded judge and
scoreboard — plus a live, steerable single-model review you can talk to while it works.
How I Think
First principles over assumptions
Clarity over cleverness
Ship, learn, improve, repeat
Long-term value over short-term gain
People first, always
“
I love building things that outlive the hype. Quiet progress. Real impact.
Beyond The Code
Constant learner
Maker of systems and stories
Father, husband, human
Always exploring what's next