Paul Julian Heise

Web applications that go live.

Built new or modernized. At a fixed price, in weeks, not months.

Why it is fast

AI does the heavy lifting.
Experience keeps it right.

Shipping production software since 2014, two companies of my own. AI makes me fast, experience makes it hold. That is why I can name a fixed price and deliver in weeks.

2014

First line of code

2×

Founder

100%

AI in the loop

1

Point of contact

How every project runs

Four steps.
No surprises.

  • 01Paid entry · Audit, workshop or check. A clear picture first.
  • 02Fixed price · Scope, milestones and price in writing.
  • 03Build in stages · A demo every one to two weeks.
  • 04Handover · Code, docs and accounts are yours.
The work

Real products,
shipped.

For clients and as founder. From customer portals to my own platforms. The proof is further down this page.

Next step

Tell me about your project.

Tell me in a few clicks. You get an answer within one business day.

See the offers ↓
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Selected Work

Real products, shipped. For clients and as founder.

Case 01 / 04Since 2025
INWX logo

INWX

Freelance / Frontend Modernization

One of Europe's top domain registrars. Freelance frontend work on their web interfaces and customer areas.

Listed by

Featured among top domain registrars on Forbes Advisor.

Visit inwx.com
Case 02 / 042026
melnyk.beauty logo

melnyk.beauty

Freelance / Website

Portfolio website for Anhelina Melnyk, nail artist. Design, build and deploy. Clean, fast, made to showcase her work.

Visit melnyk.beauty
Case 03 / 042023 – 2025
Estateable logo

Estateable

Founder / Developer / Web3 Platform

SaaS

A Web3 platform digitizing the German land registry. Real estate represented as NFTs on Ethereum. Smart contracts, wallet integration, full stack. Built end to end.

Stack / Next.js, Ethereum, Solidity, Node.js

Case 04 / 042021 – 2023
OnlyFabulous logo

OnlyFabulous

Founder / Developer / Social Media Agency

SaaS

A social media agency built around a custom CRM. Website, client onboarding, internal tooling. All self-built end to end.

Stack / PHP, Laravel, Next.js, Tailwind CSS

/ More work under NDA.

Safety for clients

Hiring a freelancer. Without the usual risks.

The typical concerns about freelancers. Answered before you ask.

  • Quality

    At most two client projects at a time. Acceptance criteria in every offer, a preview per feature, CI with automated tests and a demo every one to two weeks.

    Proof30 days of free bug fixes after acceptance. Professional liability insurance (exali).

  • Availability

    A fixed backup developer from my network who knows the stack and the project. Payment by milestone, so you never pay ahead of the current one.

    ProofSubstitution clause in the contract, milestone plan in the offer, response within one business day in maintenance.

  • Knowledge

    Code, repos, hosting and domain accounts are yours from day one. A standard stack (Next.js, TypeScript). Documentation is a fixed deliverable: README, architecture overview, decision log, runbook.

    ProofHandover session and a recorded code walkthrough, included in the fixed price.

Next step

Let’s talk
about your project.

A few clicks, a clear first answer within one business day. Then you decide.