Product engineering with applied AI
The people who plan itare the people who build it.
Two senior engineers on your project from the first call. Fixed-price discovery, then working software every week. You own what we build, and your team can run it.
Booking new projects
01Senior partners who build
Senior partners who build
Who it is for
Founders and product teams who need senior engineers from the first architecture decision to live users.
Kalebtec is a product-engineering studio with two founders. Rowin designs the architecture and writes the code. Mari runs the project. You work with both of us every week.
How we think
Built to scale
We choose the stack and data model for where your product will be in a year. See software architecture.
AI where you can measure it
AI only where it measurably improves a workflow, shipped with evaluations and permission limits. See AI development.
Honest by default
We'll tell you when a simpler setup is enough, when AI adds nothing, and when we're the wrong team.
Shipped and public
02How we work
How we work
From the first call to support after launch.
Technical discovery
Before any code, we map the problem, the users and what success looks like. Discovery is fixed-price.
Architecture & product strategy
We pick the stack and data model, then plan the roadmap.
Rapid development cycles
Small releases. You see working software every week.
Continuous optimization
We tune performance, cost and reliability as we build.
- Performance score
- Before43
- After86
- Largest Contentful Paint
- Before9.7 s
- After4.0 s
- Total Blocking Time
- Before1,750 ms
- After39 ms
This site on Lighthouse mobile, before and after our September performance pass. Median of three runs, 15 September 2026. 
Scaling & long-term support
The system grows with your traffic and team. We stay on after launch.
03What we build
What we build
Product engineering, end to end.
The discipline
Product Engineering
We help you decide what to build, then we build it.
Capabilities around it
Software Architecture
Stack and data model choices you can still defend a year from now.
SaaS Development
Dashboards, portals and admin tools built for daily use.
Fractional CTO
Architecture and roadmap calls, plus hiring guidance, without a full-time CTO.
AI Development
LLM and agent workflows, shipped with evaluations and cost controls.
AI Agents
Agents with typed tools and permission limits. A person approves risky actions before they run.
04Recent work
Recent work
Products we designed and built with our clients.
Tools
Software we make ourselves
Besides client work, we build and run our own software.
Free guide
The 90-Day AI Workflow Readiness Blueprint
Which workflows should get AI and which should stay manual, with a 90-day plan to ship your first one.
- Workflow risk tiers and approval paths
- Agent permissions and tool access
- Evaluations to run before you scale
- Cost, latency, privacy, and fallback design
- A 90-day shipping roadmap
05The team
The team
06Questions, answered
Questions, answered
What founders ask first.
What kind of companies are a good fit?
Founders and growing teams with a real product problem who want senior engineers to question their decisions. We don't take brochure-site projects here. Brochure sites go through Kalebtec Websites, at published prices.
Do you actually build with AI, or is it just a buzzword?
We build with it. We ship production LLM features, agents and browser automation where they measurably improve output or cost.
Who will I actually be working with?
Both founders. Rowin leads the architecture and writes the code. Mari runs the project. The people on your first call stay on the project after the sale.
Can you act as our fractional or outsourced CTO?
Yes. Architecture, build-vs-buy and roadmap calls, hiring guidance and hands-on engineering, for startups without a full-time CTO.
How fast can you start, and how do you communicate?
Usually within a couple of weeks. You get direct Slack access and a weekly call with both of us. We reply within 24 hours.
What does an engagement cost?
We start with a fixed-price discovery, then send a plan and a budget. If hourly rate is the main question, we're probably the wrong partner.
07Contact
Bring us the hard part.
Tell us what you're building and where it's stuck. We'll reply within 24 hours.
