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About us

Your partner in agentic automation

We don’t sell hours. We sell outcomes. AI broke the billable hour — so we sell a dedicated squad at a flat monthly rate that designs, builds, and runs agentic automation. We get faster, you get more, the price doesn’t move.

prior_auth.runHealthcare
  1. intake.readfax_2291.pdf → structured request
  2. policy.checkCMS-1500 against payer rules
  3. emr.update3 records written back
  4. queue.route1 edge case escalated to a human
Example run · 4 calls · 3 systems · 1 human decision

Trusted by teams building and running mission-critical platforms

Dunn
HCA
Healthstream
Novo
Accureg
Proof

What we've shipped

Numbers from delivered engagements, not a marketing deck.

Across enterprise engagements in regulated and complex operating environments

$100M+

in delivered value

Measured across client engagements, not modelled

285%

average efficiency gain

Platforms running in production and carrying real load

5M+

users on systems we built

Senior-only squad. No generalists, no offshored execution

15+

years on enterprise systems

“Time and materials pays a firm to take longer. That’s not cynicism, it’s arithmetic — show me the incentive and I’ll show you the outcome, as Munger put it. We started AppStream to run the other way: a dedicated team at a flat rate, with AI doing the work that used to fill a timesheet. Now getting faster is how we win.”
Justin TannenbaumCo-Founder & CEO
Our values

Principles that guide our work

Four things we will not trade away, written the way we actually behave rather than the way values pages usually read.

01

Stability over hype

Reliability, security, and predictability beat whatever shipped this week. We will tell you when a newer approach is worse for you.

02

Real-world engineering

Production-grade problems, battle-tested tools. If it does not work against your real data and your real systems, it does not work.

03

Ownership and transparency

We take the problem, not the ticket. You see what we see — including the parts that are going badly, while there is still time to act.

04

Long-term thinking

We build systems your team can still run after we hand over, and we would rather keep the relationship than win the invoice.

Open source

Giving back to the developer community

These came out of real client work and were extracted so other teams could use them. Everything here is on the .NET and Azure side of what we build.

The team

Meet the people behind the keyboards

Senior-only, no generalists, no offshored execution. Forward deployed engineers work inside your team, and the people you meet on the discovery call are the people who build it.

  • Justin Tannenbaum

    Co-Founder & CEO

  • Lukasz Chmielewski

    Co-Founder & CTO

  • Piotrek Szyperski

    Head of Engineering

  • Cesar Bustamante

    Founding Sr. Full Stack Engineer

  • Bartek Bienkowski

    Founding Sr. DevOps Engineer

  • Takami Rodriguez

    Sr. Full Stack Engineer

  • Ilia Andrienko

    Sr. Front End Engineer

  • Daniel Bukala

    Sr. Product Manager

  • Lukasz Wachnik

    Sr. Full Stack Engineer

  • Mikolaj Kaminski

    Sr. Software Engineer

  • Bartek Szyperski

    Full Stack Software Engineer

  • Ernesto Quispe

    Sr. Product Designer

  • Oleksandr Kotenko

    Sr. Front End Engineer

  • Will Gray

    Head of Go-to-market

  • Drake Lankford

    Intern

  • Taylor Larson

    Sr. Product Manager

  • Klaus Begnis

    Forward Deployed Engineer

  • Francisco Castilho

    Forward Deployed Engineer

  • You

    Join Our Team

    Get in touch.

Customer stories

Don't take our word for it

Real results from real engagements. Clients are unnamed where the work is covered by an NDA, which is most of it.

  • ConTech Company
    “What truly set this development firm apart was their exceptional technical expertise combined with business acumen.”

    CEO

  • AutoTech Company
    “They functioned more as strategic partners invested in our success than as technical vendors.”

    CEO

  • HealthTech Company
    “Thanks to AppStream's expertise we were able to translate a bold idea into a powerful product.”

    CTO

  • SaaS
    “Justin managed the project very well.”

    GTM Director

  • FinTech Company
    “AppStream delivered production-ready code faster than our internal team expected. They didn't just build what we asked for — they challenged our thinking and made the product better.”

    VP of Product

  • EdTech Company
    “We went from concept to a fully working MVP in under eight weeks. AppStream made a complex project feel simple.”

    Founder

  • PropTech Company
    “Their team integrated seamlessly with ours. Communication was clear, timelines were met, and the quality of work exceeded what we've seen from much larger firms.”

    CTO

  • Logistics Company
    “AppStream took ownership of the problem, not just the ticket. That mindset made all the difference for us.”

    Head of Engineering

Start here

Bring us the workflow

Tell us which queue in your business costs the most and we’ll tell you whether an agent can clear it. If the answer is no, we’ll say no.

Schedule a discovery call45 min. No pitch deck.

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