TwentyOne Solutions

Technology ownership for companies where software matters.

We partner with a small number of scaling businesses to build, maintain, and improve the systems they rely on. Custom software, AI, integrations, and technical direction without the burden of hiring and managing an internal team.

verified 97% repeat customer rate. 100% US-based team. 6-8 active client partners max.

Built for operators who need technology to work.

We work with post-revenue companies that have real complexity, real customers, and real operational stakes. Our clients are usually growing businesses that have outgrown spreadsheets, disconnected systems, one-off contractors, or software that only one person understands.

manage_accounts

You need better systems, but do not want to manage developers.

bolt

You have operational bottlenecks that software could solve.

psychology

You are interested in AI, but only where it creates real business value.

handshake

You want a technical partner who understands business outcomes, not just tickets.

Transparent pricing. Clear ownership.

We do not price based on hours. Our pricing reflects ownership, responsibility, and business impact.

ENGAGEMENT MODEL

Execution + Guidance

$20K/month

If scope is smaller. Same team, reduced ownership.

  • • Execute and deliver
  • • Support prioritization
  • • Stay more reactive

Outcome: Strong execution, less strategic ownership.

Get Started
DEFAULT CHOICEENGAGEMENT MODEL

Ownership + Direction

$30K/month

This is where we start.

  • • Own what gets built and why
  • • Drive prioritization and system direction
  • • Identify risks and opportunities proactively

Outcome: You don't manage technology. We do.

Book a Fit Call
ENGAGEMENT MODEL

Technology Partner

$50K/month

If fully embedded. We function as your technology arm.

  • • Own execution speed and reliability
  • • Drive technical strategy at a business level
  • • Operate with high autonomy

Outcome: You rely on us to run this part of the business.

Book a Fit Call

Technical Diagnostic

A 2-4 week deep dive into your existing stack to map out the path forward.

$5K-$10K

Get Started

Software, AI, and systems that move the business.

code

Custom Software

High-performance applications built for your specific operational needs.

memory

AI Development

Practical LLM implementation and machine learning that solves real bottlenecks.

hub

Integrations

Connecting disjointed SaaS tools into a single, cohesive business engine.

devices

Mobile & Hardware

From field apps to specialized device connectivity and IoT solutions.

You are not buying code. You are buying ownership.

JUDGMENT OVER VOLUME

We focus on making the right technical decisions that prevent future debt, rather than just hitting ticket quotas.

BUSINESS-FIRST LEADERSHIP

Our engineers understand P&Ls and operational efficiency. We speak business, not just syntax.

SMALL TEAM. HIGH TOUCH

Direct access to senior operators. No account managers, no junior hand-offs, no bureaucracy.

BUILT FOR LONG-TERM TRUST

We are incentivized to build systems that last. 97% of our clients remain partners for years.

Senior technical operators, not order takers.

"We are currently experiencing an inflection point with the capabilities of AI. The future is bright. And we can help you build it." — Sergei Golimbievsky, Founder
Sergei Golimbievsky
Sergei Golimbievsky

A 30-year software veteran, Sergei is a technical powerhouse who excels at turning complex business challenges into cutting-edge AI and software solutions.

Seth Lewandowski
Seth Lewandowski

A business-minded software expert, Seth has launched 20+ full-stack products and specializes in building high-impact, scalable software that drives real-world success.

Seth Black
Seth Black

Seth is an experienced software developer specializing in modern web applications. With a strong background in client-facing roles and customer success, he brings both technical depth and a user-first mindset to every project.

Alisa Chavez
Alisa Chavez

With an extensive medical background and growing technical expertise, Alisa bridges healthcare and technology to create intelligent, user-centered solutions for care-centered clients.

Need a technical partner who can own the outcome?

If technology is becoming too important to manage casually, let’s talk.

Book a Fit Call