We build the software your business runs on
Pylogix designs, builds and looks after custom software, AI features, mobile apps and online stores for companies in the United States and the United Kingdom. One team, from the first discovery call to the monthly support plan.
22 engineers, designers and data specialistsworking with clients from Houston and London
Trusted by brands and businesses in the US and UK
Custom software development, end to end
Four kinds of work, one team. The people who design your product also build it, connect it and look after it.
Custom software
Platforms, portals, SaaS and mobile apps shaped around how you work.
Explore 02AI and data
Machine learning, assistants and agents, and the data pipelines under them.
Explore 03Ecommerce
Shopify Plus and headless stores, plus the marketing that brings buyers back.
Explore 04Integration and support
ERP integration, modernization, cloud and monthly support.
Explore
A development partner that tells you the truth early
Most software projects that go wrong were in trouble long before anyone said so. We work in the open: you see the board, the code and the people, and you hear about a risk the week we spot it, not the month it lands.
- Fixed-price discovery before you commit
- A written update every Friday
- Working software every sprint
- Code in your repository from day one
- Changes priced before work starts
- A handover plan whenever you want one
Projects we are proud of
From first call to a live system
The same five stages on every project, so you always know what happens next and what it costs.
- 01
Discovery
2 to 4 weeksFixed price. Ends in a scoped estimate, an approach and a first release plan.
- 02
Design
WeeksFlows and prototypes tested with the people who will use them.
- 03
Build
SprintsWorking software every two to three weeks, on staging for you to try.
- 04
Launch
StagedMonitored releases, with the team on hand for the first weeks.
- 05
Support
MonthlyFixes, updates and improvements, or a handover to your team.
What we built, and why
A financial system rebuilt for new CMS payment rules
An event-driven finance platform for a home health and hospice provider, delivered to a fixed regulatory deadline while the rules were still being clarified.
Read the case study →
Remote management for utility field devices
A central web application that lets water and energy utilities change settings on their radio devices, or upgrade a whole territory, without a site visit.
Read the case study →
Sea to Summit, a thousand products made findable
A Shopify Plus redesign for an outdoor gear brand, built so shoppers can find the right item in a catalog of more than a thousand.
Read the case study →What clients say about working with us
Pylogix has proven to be a trustworthy partner for our technical needs. They consider the big picture and bring options for system flexibility and cost-effective solutions.
Their reliability, communication and efficiency make them a perfect partner for any business.
The team is incredibly talented and their attention to detail is outstanding.
Try our free software products
We also build and operate our own products, on the same stack and release process we use for client work. Every one of them is free to try.
View all our apps
MessagingPorchlightMessenger and Instagram bots, comment replies and scheduled postsTry it free Free
IdentityMyCircle.iDLink-in-bio pages, QR codes and vCardsTry it free Free
SEOAI Website AuditorA free SEO audit of any website, with a fix listTry it free Free
ConversionSocial ProofReview and sales pop-ups that build trustTry it free Free
EngagementPulseWeb push that brings visitors backTry it free Straight answers for people buying software
What to do when a development relationship is failing
The project is four months late and someone senior asks whether to find another supplier. That question is reasonable and it is being asked too early.…
Read the article →
Why connecting two systems costs more than building one
In a build you control both ends. In an integration you control one, and the other side is a contract you did not write that changes…
Read the article →
Accessibility requirements to specify before you build
Healthcare taking HHS funding had to comply by 11 May 2026, and that date was not extended. The deadlines, the litigation numbers, and the part that…
Read the article →Questions people ask us
What does Pylogix do?
Pylogix is a software development company. We design and build custom software, AI and machine learning features, mobile apps and online stores, and we look after them after launch. Most of our clients are businesses in the United States and the United Kingdom.
Where is Pylogix based?
We have offices in Houston, Texas and in London, United Kingdom, and our working hours overlap with clients in both countries every day.
How does a project with Pylogix start?
With a conversation about the problem, then usually a short, fixed-price discovery phase that ends in a scoped estimate, a recommended approach and a clear first release. You can stop after discovery and keep everything it produced.
How much does custom software development cost?
It depends on the scope. Discovery gives you a scoped estimate with a range before you commit to a build, and our guide to custom software costs shows how to compare a quote with hiring.
Do we own the software you build?
Yes. The code lives in your repository from the first commit, the contract assigns the intellectual property to you, and the infrastructure runs in your own accounts.
Tell us what you need to build
Send a rough outline. A person replies within one working day with questions, a suggested approach and what a discovery phase would cover.