Denver, Colorado

We Build Software That Actually Works

No bloat. No buzzwords. Just clean, custom-built software that solves your problem and ships on time. 150+ projects delivered since 2016.

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150+
Projects Delivered
97%
Client Retention
8
Years in Business
0
Missed Deadlines
Trusted by teams at

What We Do

Four things. We do them extremely well.

Web Applications

Full-stack web apps built with React, Next.js, or whatever your stack demands. Dashboards, SaaS platforms, customer portals — designed for speed and built to last.

Mobile Apps

Native and cross-platform mobile applications for iOS and Android. Built with React Native or Swift/Kotlin when performance is non-negotiable.

APIs & Integrations

Connect your tools. Automate your workflows. We build robust APIs and system integrations that eliminate data silos and manual busywork.

Legacy Modernization

Stuck on outdated tech? We migrate aging systems to modern architectures — incrementally, safely, without breaking what already works.

How We Work

A straightforward process. No surprises, no scope creep.

Discovery

We learn your business, map your workflows, and define exactly what needs to be built. No guessing.

Design

Architecture and UI prototypes you can see and click before a single line of production code is written.

Build

Two-week sprints with weekly demos. You see progress in real time and steer the product as it takes shape.

Launch & Support

We deploy, monitor, and support. Every project includes 90 days of post-launch maintenance at no extra cost.

Our Guarantees

We put our money where our mouth is. Every engagement comes with these commitments.

Fixed-Price Contracts

We quote a price. We stick to it. If the project runs over, that's on us — not your budget.

On-Time Delivery

150+ projects. Zero missed deadlines. We build in buffer so real life doesn't derail your timeline.

90-Day Warranty

Post-launch bugs? We fix them free for 90 days. No tickets, no billable hours — just a quick fix.

About Letter99

A small team that punches above its weight.

Letter99 started in 2016 when our founder got tired of watching companies get burned by agencies that overpromise and underdeliver. The idea was simple: build a shop that writes great code, ships on time, and treats clients like partners, not invoices.

Based in Denver's tech corridor, we're a tight team of senior engineers and designers. No juniors billing senior rates. No offshore handoffs at midnight. Every person who touches your project has 8+ years of experience and a direct line to you.

We've built inventory systems for warehouses, scheduling platforms for healthcare networks, real-time dashboards for logistics companies, and everything in between. What unites our work is a relentless focus on simplicity — software that does exactly what it needs to, and nothing more.

You Own Everything

Your code, your repo, your infrastructure. No vendor lock-in, no hostage situations. Walk away with everything if you want.

Radical Transparency

Shared Slack channel, weekly demos, real-time access to the codebase. You always know exactly where your project stands.

Senior Engineers Only

Every developer on your project has 8+ years of production experience. We don't do bait-and-switch staffing.

Denver-Based, US-Only

Same timezone, same work hours, same language. Communication is never a bottleneck on our projects.

What Clients Say

Real results from real projects. These are people you can call.

“
Letter99 rebuilt our inventory system in four months flat. Our warehouse team went from three manual spreadsheets to a single dashboard. Errors dropped 80% in Q1. Best money we've ever spent on software.
Marcus Chen
Marcus Chen COO, Alpine Supply Co.
“
We needed a patient scheduling platform that worked with our EHR. Two agencies failed before Letter99 nailed it — on time and under budget. Our staff actually enjoys using it, which says everything.
Dr. Sarah Novak
Dr. Sarah Novak Director, Front Range Health Partners
“
The API layer they built connects our CRM, billing, and field ops into one seamless flow. What took our team hours of copy-pasting now happens automatically. We've saved 20+ hours a week across the organization.
James Whitfield
James Whitfield VP of Operations, Ridgeline Services

Ready to Build Something?

Tell us about your project. We'll give you an honest assessment and a fixed-price quote within 48 hours.

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Let's Talk

No sales pitch. Just a straightforward conversation about what you need built.

Get in Touch

Drop us a line, give us a call, or stop by our Denver office. We respond to every inquiry within one business day.