flowsen
Jan Poth, freelance software developer from Hamburg
Software that just works.
Moin, I’m Jan. I build web and mobile apps, join your team on an hourly basis and show companies how to develop faster with AI agents.
My own product
An app with 145,000 users. Built solo.
Mr. Cook is a digital cookbook for iPhone, Android and the web. I came up with it, built it and still run it today: app, website, servers, subscriptions, support.
Keeping a product alive on your own teaches you what really matters and what you can leave out. That is what I bring to your project.
- users
- 145,000+
- stars in the stores
- 4.7
- languages
- 12
- platforms
- 3
AI and agentic coding
My team is made of agents.
I can only develop Mr. Cook on my own because AI agents work alongside me. Several write code in parallel, each in its own working copy. None of it goes live before tests and checks have passed and I have approved it.
For me this is not an experiment, it has been my daily routine for a long time. And it is what many companies are facing right now: not a chat window next to the work, but workflows where AI has a fixed place.
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In development
Agents carry out tasks on their own. Clear rules in the repository and automated checks keep the code reliable.
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In the product
In Mr. Cook, AI imports recipes from Instagram, TikTok and websites and suggests weekly meal plans. Thousands use it every day.
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In operations
Agents prepare my analytics, ad reports and marketing content on fixed routines. I only make the decisions.
Services
What you can hire me for.
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An extra developer for your team
I get up to speed in existing code quickly and own tasks end to end, from concept to release. For as long and as much as you need me.
Billed by the hour
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Agentic coding in your team
Together with your developers I set up what I use every day: coding agents in your own repository, with rules, checks and a workflow you can trust. After that you carry on without me.
A workshop, or support over a few weeks
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AI for your company
We find the places where AI really takes work off your hands, and I build them: as a feature in your product or as automation for processes that are done by hand today.
Hourly or fixed price
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Your product, from zero to live
Your idea becomes a first version that real users can use. Web app, iPhone and Android app, servers and operations all come from one person.
Hourly or fixed price
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A second opinion
Architecture, code review, performance or a project that is stuck: I take a look and tell you honestly what I would change.
A few hours are often enough
Working together
Easy from the first Moin.
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Intro
You tell me what it is about. We have a short call, free and with no obligation, and I tell you honestly whether I am the right person for it.
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Start small
We begin with one manageable first task. Within a few days you see how I work, before you commit to more.
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Keep going
You get regular builds you can try out and a timesheet you can follow.
- Billing
- Hourly or day rate. Fixed price when the scope is clear.
- Location
- Remote, or on site in Hamburg.
- Language
- German and English.
- Contract
- With Flowsen Software UG, a German limited company, with proper invoices.
About me
Flowsen is me.
I have been building software since 2013. First in my own projects, then as a senior software developer at Engel & Völkers Technology on large international platforms. I have worked in small and large teams, helped shape key decisions and seen projects through from start to finish.
Today I build my own product at Flowsen and work for selected clients alongside it. You always talk to me directly, not to a sales team.
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Since 2023
Mr. Cook
Founder and sole developer.
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Before that
Engel & Völkers Technology
Senior software developer on international platforms with high traffic.
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2022
B.Sc. Applied Computer Science, HAW Hamburg
Bachelor’s thesis on machine learning for estimating property prices.
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2016 to 2021
RocketLeagueValues
My own community platform with more than 10 million page views.
Common questions
Short and honest.
Do you work inside existing teams?
Yes, gladly. I work in your repository, with your tools and your process, and join the meetings that make sense.
Does AI write your code?
A large part of it, yes. I plan, read and check every change and answer for the result. You get more done in the same time. If AI tools are not allowed at your company, I work without them.
How much time do you have?
Mr. Cook stays my product, and I take on selected client work alongside it. Tell me what you need and by when. I will tell you honestly whether and from when that works.
Do you bill hourly or at a fixed price?
Preferably by the hour or day: you only pay for what you need and can change direction at any time. When the scope is clearly defined, I can also quote a fixed price.
Who is the contract with?
With Flowsen Software UG (haftungsbeschränkt), a limited company based in Hamburg, Germany. It is my company; I am its managing director and the only person working there.
Which technologies do you work with?
I am fastest with TypeScript, React and React Native. I have also worked with PHP, Python and Java, and with agents a new language is no longer much of a hurdle. Just ask.
Contact
Tell me what you’re planning.
Send me a few lines about what you need and by when. I usually reply within one or two working days.