About Me
Simon Stemplinger
I work with founders and product teams to explore ambitious product ideas through rapid prototyping, technical R&D and hands-on engineering.
My work combines hands-on engineering, technical strategy, product thinking and rapid prototyping. I am particularly interested in projects with high uncertainty: new product ideas, AI-driven workflows, technically difficult systems and products that still need to be explored collaboratively before a clear implementation path exists.
Based in Berlin, working remotely.
How I Work
Many of the most interesting products do not begin with detailed specifications.
They start as:
- rough ideas
- technical unknowns
- product hypotheses
- difficult constraints
- “this probably isn’t possible, but…”
I work closely with founders and product teams to explore these ideas quickly through iterative prototyping and engineering.
This often includes:
- technical feasibility exploration
- rapid product prototyping
- AI and automation workflows
- software architecture
- infrastructure and scalability
- technical product strategy
- helping early teams make better technical decisions
I enjoy working at the intersection of:
- engineering
- product design
- experimentation
- communication
- systems thinking
Over the last 20 years I have worked across startups, healthcare, logistics, e-commerce, enterprise systems and infrastructure-heavy products, both as a founder and as a hands-on technical leader.
Projects I Enjoy
I am especially interested in:
- technically ambitious products
- AI-native workflows and tooling
- early-stage product exploration
- developer tools and infrastructure
- healthcare and regulated systems
- computer vision and edge systems
- products where engineering and product design evolve together
- projects with unusual technical or operational constraints
Selected Projects
mTOMADY
At mTOMADY we are building digital healthcare infrastructure that enables affordable access to healthcare in developing countries in sub-saharan Africa.
The platform connects patients, hospitals and healthcare sponsors while integrating secure payments and healthcare savings through mobile wallets.
Liefery
I joined Liefery early to help design and build a same-day logistics platform from scratch.
Over six years we evolved the system from early product exploration to a scalable logistics platform, built an engineering organization and supported the company through growth, profitability and acquisition.
Liefery provides ultra-fast same-day delivery for major retailers and e-commerce companies.
Papersmart
At Papersmart I worked as co-founder, CTO and hands-on developer building a custom e-commerce marketplace in Rails from scratch.
The platform included advanced pricing, product matching and order optimization features designed to improve purchasing efficiency and user experience.
BizSphere
At BizSphere AG I joined as co-founder and first engineer, helping turn an ambitious enterprise product idea into working software for global customers within a few months.
Alongside hands-on engineering I coordinated distributed teams across multiple time zones, worked directly with enterprise IT departments and built cloud-based deployment infrastructure.
Other Projects
Other freelance and consulting work includes:
- customer service systems for O2 Germany
- core banking systems for DiBa Austria
- mortgage consulting software for Sparkasse Germany
- custom internal enterprise software and infrastructure projects
- early AJAX-style web applications long before modern frontend frameworks existed
What People Say
There were several traits of Simon that impressed me from the start and that I grew to rely on over the years. First of all, Simon has an immense competence in enterprise java, frameworks… short: he was the master of our entire software backend. As a colleague, I valued his reliability and willingness to help out and be a team player. Being very organized and proactive at the same time, he was a constant driver of improvement in our organization.
Not only did we trust fully in his reliability and integrity as a colleague and co-founder, but we also elected him into our supervisory board where he represented the founder team for many years.
Simon is a very driven and motivated professional. As project and requirements manager you could always count on him, swiftly solving issues, regularly communicating with the client and maintaining a good morale amongst his team members.
Writing & Links
You can read more about what I am working on on my blog.
You can also find me on:
Get In Touch
If you are exploring a technically ambitious product idea, trying to validate a new concept or looking for an experienced hands-on technical partner, feel free to email me.
