Developer coach and builder.
AI can write the code. I help developers figure out what to build, how to build it, and what not to outsource.
See how I work ↓One of these probably sounds familiar
You have an idea, but don't know what to build.
Too many possibilities. You need to find the smallest thing worth building and start there.
AI writes more of your code, but you're less sure about the decisions.
You want stronger architecture, technical judgment and ownership, not to become a faster code generator.
You're building a SaaS and keep getting stuck.
You need another experienced engineer to challenge decisions, review code and help you get from idea to production.
You want to become a stronger engineer.
Not another tutorial. Real feedback, deliberate practice, and someone who has been through the same problems.
If any of these sound familiar, let's talk.
Book a call →Build. Think. Grow.
Build
Turn an idea into something real. Product scope, architecture, implementation, shipping.
Think
Make better engineering decisions. Architecture reviews, AI-generated code, tradeoffs, technical direction.
Grow
Become the engineer who can own the whole thing. Python, Rust, AI, software design, problem solving.
20 years building software
Co-founder of Pybites. 150+ developers coached. Thousands of code reviews. Built and shipped SaaS products.
Hello World → payroll SaaS
Ryan went from basic scripts to a full payroll app in three months. We worked through architecture and shipping, and he landed his first paying business client running their payroll on thepayroll.app.
AI prototype → production SaaS
Luca had an AI-built proof of concept he couldn't validate alone. We worked through Django settings, payment security and a testing strategy, and he shipped to production with confidence.
Developer → Senior AI Engineer
Piotr learned to write clean, well-tested, production code and to think critically about it. He was promoted to Senior AI Engineer and became a team coordinator.
Bring me the thing you're stuck on
- We get on a call.You show me what you're building or figuring out.
- We find the highest-leverage problem.The one thing that unblocks everything else.
- I challenge the assumptions.We make the decision together and I give you a concrete next step.
- It can become ongoing work.If there's a fit, coaching or project work from there. No packages to pick first.
I'm Bob Belderbos.
I've been building software since 2006, from shell scripts and Python automation to large systems and SaaS products. I co-founded Pybites in 2016 and have spent years helping developers write better code and become stronger engineers.
These days I'm focused on what happens when AI makes producing code dramatically cheaper: what should we build, how do we make good technical decisions, and how do we keep humans responsible for the result?
Read my full story →Have something you're building or figuring out?
Let's talk. Bring the problem, and we'll work out whether I can help.
Prefer email? Drop me a line →
Not ready to talk? I write about engineering judgment, AI and building software. Read Mastery over Hype →
