Custom software development services
Web applications, mobile apps, APIs and integrations, built by engineers who test for a living and delivered with automated tests from the first commit.
Overview
TopNotch provides custom software development for startups and growing businesses that need software built properly the first time. Because quality assurance is our background, every project ships with automated tests, CI/CD pipelines and clear documentation.
Whether you need a new web application, a mobile app for iOS and Android, or integrations between the systems you already use, we deliver maintainable code your team can own and extend.
What's included
Web application development
Customer portals, dashboards, internal tools and SaaS products built on modern, maintainable frameworks.
Mobile app development
iOS and Android apps, native or cross-platform, with real-device testing built into delivery.
API development and integrations
REST and GraphQL APIs, plus integrations with payment providers, CRMs, ERPs and third-party services.
Legacy modernization
Incremental rewrites and refactoring, protected by automated tests so existing features keep working.
AI-enabled features
AI capabilities added to new or existing applications. See AI development
Quality built in
Automated tests, CI/CD and documentation on every project. See QA testing services
Why choose a QA-led development team
Fewer bugs in production
Tests are written alongside features, not bolted on at the end.
Code you own
Clean, documented code and full handover. No lock-in, no mystery codebase.
Predictable delivery
Fixed-scope milestones and regular demos, so you always know where the project stands.
Tools and technologies
We work in modern, widely supported stacks such as TypeScript and JavaScript, React, Node.js, Python, Swift, Kotlin and cross-platform mobile frameworks, deployed to major cloud providers with automated CI/CD.
Read our Case Studies to see how we work with product teams.
Further reading: Manual vs. automated testing: how to choose the right mix
Common questions
Web applications, SaaS products, customer portals, internal tools, iOS and Android mobile apps, APIs and integrations with third-party systems.
You do. All source code, tests and documentation belong to you, and every engagement ends with a full handover.
We're QA-led. Automated tests, CI/CD and documentation are part of every project from the first commit, which means fewer bugs in production and code that's easier to maintain.
Yes. We regularly extend, refactor and modernize existing applications, adding automated tests first so current features keep working.
Tell us what you're shipping next.
Book a free 30-minute assessment. We'll look at your release process, point out the biggest risks, and tell you honestly whether we can help.