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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.

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Team collaboration in modern office
Creative team brainstorming
Team meeting and planning
Collaborative workspace
Business strategy session

What we've shipped

$100M+
In value delivered
to clients
15+
Years building
enterprise systems
285%
Average efficiency
gain for clients
5M+
Users on systems
we've built

“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.”

JT

Justin Tannenbaum

Co-Founder & CEO

Our values

Principles that guide our work

Open Source & Community

Giving back to
the developer community

We actively contribute to open-source projects we use and believe in. These tools are built in real enterprise projects and shared to help teams build, scale, and modernize faster.

C#

Smart Parser

SmartParser is an open-source utility library designed to transform unstructured data — such as raw text or images — into structured, strongly-typed objects.

6
42 contributions
TypeScript

Remix Boilerplate

A boilerplate for Remix apps with a focus on security, performance, and best practices.

0
11 contributions
C#

Azure Durable Patterns

Our library is here to help you make better use of Azure Durable Functions Framework without unnecessary boilerplate code.

5
23 contributions
C#

Healthcare Bluebook SSO

AppStream.HealthcareBluebook is an open-source .NET Core library designed to simplify the integration process with Healthcare Bluebook's Single Sign-On (SSO) system using SAML 2.0.

3
10 contributions
C#

Validate Plugin

ValidateObject is a plugin introduced for the SK Hackathon #1, hosted by Microsoft.

3
10 contributions
C#

Semantic Kernel Fork

Semantic Kernel (SK) is a lightweight SDK enabling integration of AI Large Language Models (LLMs) with conventional programming languages.

4,200
995 contributions
C#

Busy Bee

Fast and observable background job processing for .NET.

101
59 contributions
View all repositories on GitHub

Meet the people behind the keyboards

Our team combines deep engineering expertise with hands-on experience in enterprise environments. We work closely with clients' internal teams to ensure clarity, alignment, and quality delivery.

01
JT

Justin Tannenbaum

Co-Founder & CEO

02
LC

Lukasz Chmielowski

Co-Founder & CTO

03
PS

Piotrek Szyperski

Head of Engineering

04
CB

Cesar Bustamante

Founding Sr. Full Stack Engineer

05
BB

Bartek Bienkowski

Founding Sr. DevOps Engineer

06
TR

Takami Rodriguez

Sr. Full Stack Engineer

07
IA

Ilia Andrienko

Sr. Front End Engineer

08
DB

Daniel Bukala

Sr. Product Manager

09
LW

Lukasz Wachnik

Sr. Full Stack Engineer

10
MK

Mikolaj Kaminski

Sr. Software Engineer

11
BS

Bartek Szyperski

Full Stack Software Engineer

12
EQ

Ernesto Quispe

Sr. Product Designer

13
OK

Oleksandr Kotenko

Sr. Front End Engineer

14
WG

Will Gray

Head of Go-to-market

15
DL

Drake Lankford

Intern

16
TL

Taylor Larson

Sr. Product Manager

17
KB

Klaus Begnis

Forward Deployed Engineer

+

You

Join Our Team

We're always looking for experienced engineers and product-minded professionals who enjoy working on complex, AI first systems.
Get in touch

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Build with us

We're always looking for engineers, architects, and product thinkers who ship.

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Customer stories

Don't take our word for it

Real results from real engagements. Here's what it's like to work with us.

ConTech Company

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

CEO

ConTech Company

AutoTech Company

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

CEO

AutoTech Company

HealthTech Company

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

CTO

HealthTech Company

SaaS

“Justin managed the project very well.”

GTM Director

SaaS

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

FinTech Company

EdTech Company

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

Founder

EdTech Company

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

PropTech Company

Logistics Company

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

Head of Engineering

Logistics Company