AI product build
Reflexa
Reflexa turns a handful of selfies into professional headshots and portraits. We took it from concept to launch, covering product design, the AI training pipeline, billing, the admin and the brand.
Read the case studyWe build AI products that launch, and rescue the ones that won’t.
Park23 builds custom web and mobile software and AI products from scratch, adds AI to the products you already run, automates the work your team does by hand, and turns stuck Lovable, Replit, v0, Bolt and Cursor apps into real products. Every project is led by founder Virgil Nilson, one of the top-ranked AI developers in the world.
You talk to the engineer who builds it. No account managers, no hand-offs.
- Top 0.1%of agencies worldwideUpwork Rank
- Run by one of theTop 0.01%of freelancers worldwideUpwork Rank
- 100%Job SuccessUpwork profile
- 5.0★rating across 50+ jobsClient reviews
01
Where are you starting?
I need a web or mobile app built
Web apps, mobile apps, internal tools and platforms, built by senior engineers from spec to launch.
I have an idea for an AI product
We take it from idea to launched product: scope, architecture, build, launch.
I want to add AI or automate a process
Document processing, assistants, agents and workflows wired into the tools you already use.
My AI-built app is stuck
Built with Lovable, Replit, v0, Bolt or Cursor and it won’t hold up in production? We keep what works and fix what doesn’t.
I need a technical lead and a team
Virgil as your technical lead, plus senior engineers assembled for your project.
02
Supermarket
A prediction market platform, built by a team we led.
Supermarket lets anyone create a market on any topic and trade on the outcome. We led the small team of engineers that built it: AI-generated market images, video and settlement criteria, live sports, politics and economic data feeds, payments, and a custom matching engine.
Read the case study
“Virgil is an exceptional developer with multi-disciplinary, full stack capabilities. He is highly communicative, clearly sets then meets or exceeds expectations, and serves as a very effective team leader/project manager… He consistently produced lovely, well-functioning front end interfaces and reliable, robust back ends, across a broad range of technologies.
Recommended without reservation.”
03
More shipped work
Product architecture and team leadership
Polyoptions
Polyoptions lets traders write options contracts on prediction market outcomes, collateralized by positions they already hold. Nobody had built it before. We architected it and led the team that did.
Read the case study
Vibe-code rescue and AI product build
Signa
Signa proved its idea for AI jewelry design with a Replit prototype. We built it into a production B2B platform with business accounts, subscription billing, AI image generation and automated workflows.
Read the case study
AI product build
Explainr
A training school’s trainers wanted students to have “someone with infinite knowledge in their pocket.” In about a week we turned that into a working AI tutor that narrates any PDF as a lesson and answers spoken questions about it. It became Explainr.
Read the case study
Vibe-code rescue and ongoing development
Clipflo
Clipflo is a video gallery platform for wedding content creators, built in Lovable by its founder. It took off fast, and its creators were soon uploading far more video than a first version is built for. We rebuilt the upload pipeline for scale and stayed on as Clipflo’s engineering team.
Read the case study
04
Built with AI, stuck at the last 20%?
AI builders get you a demo. Launching takes everything underneath it.
What the AI builder gave you
- A working demo
- Screens that look right
- Happy-path flows
What launch needs
- Real authentication and permissions
- Locked-down database rules
- Payments that handle failures
- Background jobs
- Reliable deploys
- Tests and monitoring
05
Ways to work with us
Fixed price when the scope is clear. A monthly team when it isn’t.
Strategy call
Free
30 minutes, with Virgil
For anyone deciding what to build, fix or automate
Book a free strategy callA straight answer on your project before you spend anything.
- What you need, and what can wait
- What it should cost
- The fastest path to launch
Launch Blueprint
$1,499
Fixed price, 5 business days
For AI-built apps, new AI products and automations
Get a Launch BlueprintBuilt with Lovable, Replit, v0, Bolt or Cursor? A senior engineer reviews your code, security, payments, data and hosting and tells you what to keep, fix or rebuild. Planning something new? We test it on a sample of your real data and work out the models, costs and architecture. You get a clear path to launch and a quote, 100% credited toward your build.
Monthly development
$2,900+
Per month. Cancel with 30 days’ notice
For ongoing work and anything where the scope is still moving
Book a call to get startedA dedicated block of senior engineering hours every month, led by Virgil, for new features, fixes and support without re-quoting every change.
- Support20 hours$2,900/mo
- Build40 hours$5,600/mo
- Team80+ hoursfrom $10,500/mo
06
Work directly with Virgil
Virgil Nilson is a senior AI engineer and technical lead, Top Rated Plus on Upwork with 100% Job Success and five-star reviews from founders who hired him again.
Before software, he founded and ran a 50-person company, which is why clients say he communicates like a partner, not a vendor. He leads every Park23 project personally, building hands-on or running a small team of senior engineers.
“I hired Virgil to help with a small development update and it turned into a fantastic long-term relationship. Virgil is hands-down one of the best people I’ve hired on Upwork.”
07
How we work
- 1
Scope
We agree on what gets built, what it costs and when it ships.
- 2
Build
Milestones or a monthly plan, with regular progress updates. Problems raised early, in plain English.
- 3
Launch
We deploy, monitor and hand over. Then we stay on if you want us to.
You own all the code, accounts and IP. No lock-in.
08
Questions
How much does a project cost?
Two ways: a fixed price once the scope is clear, usually after a Launch Blueprint, or a monthly plan from $2,900 when it’s still moving. The Launch Blueprint fee is credited back when you build with us.
Who actually writes the code?
Virgil leads every project and writes code himself; larger builds add senior engineers he hires and manages.
Should I rescue my AI-built app or rebuild it?
Usually rescue: we keep what works and replace what won’t survive production. The Launch Blueprint gives you a clear verdict.
Do you sign NDAs?
Yes, before we see anything sensitive.
Which AI models do you work with?
OpenAI, Anthropic Claude, Google Gemini, open-source models, ElevenLabs, Replicate, Fal and more. We pick what fits your cost and quality needs.
What happens after launch?
We can stay on as your team on a monthly plan, or hand everything over with documentation.
LET’S TALK.
Book a free 30-minute call with Virgil
Pick a time that suits you. You’ll get a straight answer on what you need, what it should cost and the fastest path to launch.
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