Yellow Sun Software · est. 2007

Output,
not activity.

We build and replace the systems a business runs on. AI changed how much ground one senior team can cover in a week. It did not change who signs off, and the panel on the right is the whole claim.

Delivery pipelineGold = a person
SpecPerson
BuildAgents
ReviewPerson
ShipPerson
Named engineer accountableAgent-assisted, test-gated

Three of the four stages are a person's name on a document. The agents work in the one stage where breadth is the bottleneck.

Channel 01 · Platforms

We build every layer

Cloud, phone, web, services, devices and the data underneath — one team across all of it. Which is the point: the seams between the layers are where projects go wrong, and here they are nobody else’s problem.

Retail · energy
Cloud

An Azure asset pipeline serving 80+ store layouts and processing millions of images. Container Apps, Service Bus, Blob, Key Vault.

Field work
Phone

iOS and Android, offline-first, built against the same API as the web so what the crew sees and what the office sees never disagree.

Portals · marketing
Web

Vue and Astro, handed over with the design system that produced them. Fast on a phone on a bad connection, WCAG, Entra ID.

Healthcare · insurance
Services

REST and EDI X12. HIPAA-compliant claims orchestration, rating engines, document pipelines, the integrations nobody wants to own.

Retail · facilities
Devices

Security camera integration, signal tracking, IoT sensors and the automation that acts on them — hardware that reports where things are and what just happened, wired into the same systems as everything else.

Non-profit · education
Data

Relational and document stores alike — PostgreSQL, SQL Server, Cosmos DB — with dynamic reporting engines and per-affiliate configuration across regions.

Shipped for Microsoft, FedEx, Match.com, Lamb Weston and Mutual of Enumclaw among others, under the same name, from the Pacific Northwest, since 2007.

Channel 02 · The pipeline

AI turns up the gain on whatever you already do.

It has made us faster. It would have made us faster at being wrong, too — gain does not care which. These four habits decide which one you get, and not one of them is a model choice.

01

Spec before code

Every change starts as a written spec with its acceptance criteria in it. A person and an agent work from the same document, and it is also what the reviewer reads.

02

Agents take the breadth

Codebase-wide refactors, test scaffolding, migration sweeps, the second and third integration that look like the first. Wide, shallow, verifiable work.

03

Review is the gate

Nothing merges without a named engineer on it. The speed comes from the preparation, not from skipping the check, and we will put that in the contract.

04

The leverage stays with you

Tooling is wired into your tracker, your data and your build over MCP, inside your tenant. When the engagement ends the pipeline is yours and it still runs.

Channel 03 · Services

Six ways we can serve you

Platforms, above, is what gets built. This is how you buy it — from a scoped project, to a seat on your team, to us handing you the practice and leaving.

Build it

You have an outcome and a date. We take the whole thing — spec, build, review, ship — and hand it back with the documentation that explains it.

spec · estimate · milestones

Advise

Architecture review, modernization roadmaps, cloud migration planning, and a straight read on where AI earns its keep and where it does not. Decisions you can act on, not a deck.

architecture · roadmaps · azure · ai strategy

Embed

Senior engineers inside your team, your repo and your standup for a stretch. Capacity when hiring would take longer than the problem allows.

your process · your tools · named people

Take it over

The system nobody left an owner for. We read it, tell you honestly what it costs to keep, improve or replace — and then do that.

audit · handover · maintenance

Keep it running

Something is live and has to stay that way. Patching, upgrades, the integration that breaks when a vendor changes an API, and someone to call when it does.

support · upgrades · someone to call

Install the practice

The pipeline above, standing in your shop: specs your people write, agents on the breadth, review gates that hold. We set it up, train on it, and leave.

mcp · agent pipelines · spec workflow

Channel 04 · In development

Orbit

A CRM built to outlast the churn. We host it, we set it up with you, and the plan carries hours of our time — so the system keeps fitting the business instead of drifting away from it.

We run it
No servers, no upgrades, no database to look after. You get an account and a phone number to call.
The phone app ships with it
Not a later tier. For people working away from a desk it is the main way in, built against the same API as the web app.
Hours, not just a licence
A small book of customers on purpose, so the plan can include the time to shape Orbit around how you actually sell.

Your own objects, fields and words, and your own colours, without a migration or a developer. We create the tenant during onboarding and your people join by invite — there is no sign-up form to get lost in.

Channel 05 · Contact

Bring us the idea
you keep not starting.

An hour on a call. No deck, no requirements document, no need to know how it would be built. We will tell you what it would take, what we would do first, and what has quietly become cheap that was not eighteen months ago. Sometimes the answer is that you do not need us — that is a good hour too.

The one you shelved
It died on an estimate. Estimates have moved.
The one you do by hand
The spreadsheet, the re-keying, the Friday afternoon that belongs to nobody.
The one you were told was years out
The integration, the app, the rebuild. Ask again.
Bring us an ideabrenton.unger@live.com