API Development
Connections that fail loudly
API development is the work of connecting your app, website and other systems so data moves without someone copying it by hand. I build those connections myself and log every failed call where you can read it.
★★★★★ 5-star rated on Google · 14 years · 300+ Las Vegas businesses
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API Integration Services
What an API connection does
An API is the agreed way two systems talk. Your website asks a booking calendar for open times, your app sends a new client to the CRM, and a payment processor confirms that a card went through. Each request is a small message with a defined shape, and the other system answers in a defined shape too.
Most businesses only notice a connection when it breaks. A form submits, the lead never reaches the CRM, and nobody sees an error. I build connections so a failed message is logged, retried where a retry is safe, and reported in a list you can read, so a missing customer is never silent.
How to Create an API for Beginners
Four decisions before any code
Creating an API starts with decisions. These four come first, and each one goes into the written scope before I write a line of code.
1. Name the data and the callers
List each piece of information the systems share and which system is allowed to ask for it, so every connection has a named owner.
2. Set the rules for each call
Define the inputs, the outputs, the required fields and the error message for each request, so a bad call fails with a clear reason.
3. Log every request
Record each call with a time, a result and a reference number, so you can trace one customer from the first form to the final record.
4. Plan the first change
Put a version number on each call, so an update on one side does not break the other side on the day it ships.
API Development Tools
The parts that make up a connection
A working API needs a few parts. A database holds the records. A small service receives the requests and checks who is asking. A queue holds slow work, such as sending a confirmation or syncing a long list, so the customer does not wait on it. A log records each call.
The tools depend on the systems you already run. I have built with Stripe for payments, Neon Postgres for the database and Vercel for hosting, since each of those keeps a clear record of what happened. The choice is written in the scope, so your team knows what each part does before launch.
API Development Framework
How I build a connection
Every connection gets a written contract first. The contract lists each call, its fields, its errors and its owner. I write tests against that contract, so a change that breaks the contract fails before it reaches a customer.
After the contract, I build the sending side and the receiving side, then run test calls with real data shapes, including the bad ones. Each result goes into the log, and each failure gets a fix and a retest rather than a note that says it probably works.
API Development Portfolio
Work I built, live where you can check it
Website build · Henderson
GIOSTAR: the clinic website, booking and lead tracking
I built and run giostarwellness.com for a regenerative medicine and wellness clinic in Henderson: every service page, online booking, financing and a blog. A website lead is tracked end to end, from the form to a booked consult to an active patient, with no manual steps. I also built its live brand hub, so every page, post and print piece pulls the same colours, type and rules.
See the live sitePortfolio Examples
More of the work
Website build · Las Vegas
WebVegas: a Las Vegas web design brand and its booking funnel
See the live site
Brand mark · Event venue
Desert Inn Oasis: the refined mark and the plan for the new site
Site in build
Brand identity · Pharma
Mili Pharma: the butterfly mark and the lockups
Site in build
Social content system
Quotible: a testimonial-led social series
Content system
Want me to look at your site first?
A free audit, and a same-day reply from Justin, personally.
Versioning and Monitoring
What I watch after launch
| What I watch | What it means | Who sees it | How it reaches you |
|---|---|---|---|
| Failed calls | A request the other side rejected or never answered | You and me | A daily digest with a reference number |
| Slow responses | A call that takes long enough to lose a customer | Me, first | An alert when a set threshold is passed |
| Vendor changes | A notice that a partner system will change its rules | You | A written note with the date the change takes effect |
| Version drift | A call still running on an old version after an update | Me | A line in the next report, with the fix attached |
| Silent drops | A record the sending side believes it delivered and the receiving side never got | You and me | A reconciliation check that flags the gap |
How Much API Development Costs
What moves the price of a connection
I quote a fixed price for a written scope, and the scope decides the number. The biggest factors are how many systems the connection reaches, how many calls each one makes, and whether the other side publishes clear documentation. A connection to a system with good documentation takes less testing than one that answers in unexpected formats.
Ongoing monitoring and version changes are written as their own line, so you can see what the build costs and what the upkeep costs before you commit. A single number before the scope exists would be a guess, and I would rather give you a written one that you can check.
API Development Reviews
What clients wrote on Google
- ★★★★★
After going back and forth on whether to bring in outside help, we ended up working with Justin for some AI consulting on how to structure our operations. He laid out a clear plan, didn't overcomplicate it, and we've been running smoother since. Good fit for a service business. He knows Las Vegas and he knows this stuff.
Kristen S. · Google
- ★★★★★
Justin joined our team a few months before opening to replace a marketing agency that wasn’t performing. He stepped up fast. Within weeks he launched a fully redesigned website with new brand guidelines, built and delivered our marketing plan and AI strategy, and helped implement our system architecture so we could open on time. Since then, he’s made several critical enhancements to the site that helped us generate revenue in our first month. His engagement was supposed to end at opening, but he became such an integral part of our leadership team that we kept him on to help evolve our marketing and tech strategy as we grow. He’s easy to work with, pushes back when it matters, and moves easily between strategy, delivery, and operations depending on what’s needed. If you’re looking for a deeply experienced, knowledgeable, and dedicated marketing, AI, or technology consultant, I highly recommend Justin Harris AI Consulting.
Devin R. · Google
- ★★★★★
Justin has been a true Gem to have as part of our company. His professionalism, immediate attention to branding and extensive details in marketing has made so much improvement on our business. We are forever grateful to have such and amazing marketing asset and cannot thank you enough Justin!
Desi W. · Google
- ★★★★
Justin Harris was very helpful in resolving some issues we had with our Webflow website.
Kristy F. · Google
- ★★★★★
I had the pleasure of working alongside Justin and consistently saw firsthand the level of dedication and professionalism he brings to his work. He was always the first one in the office, setting the tone with his strong work ethic and commitment to excellence. What stood out most was how deeply he cared about every client. He approached each project with thoughtfulness, expertise, and a genuine drive to deliver meaningful results. He combines sharp technical knowledge with a practical, solutions-oriented mindset, which makes him especially effective in the AI space. Any organization looking for thoughtful, reliable, and highly skilled AI consulting support would be in great hands working with him!
Jenevine Y. · Google
- ★★★★★
Hired him to manage our AI systems and it's been pretty smooth. He knew what needed to be done and got it handled without a lot of back and forth. Good experience for our service business.
BC G. · Google
- ★★★★★
I follow Justin on social media and read about his work and his contributions to the AI industry. He really knows how to use the technology in creating a system that allows you to make your business work more efficiently and effectively.
Ana J. · Google
- ★★★★★
Justin was the person I would go to for advice about AI automation for my workload. He knew the subject well and didn't overcomplicate it. For anyone in Las Vegas running a service business and wondering if AI systems are worth looking into, talking to him first is a great move!
Yaneliz M. · Google
- ★★★★★
Working with Justin is always a pleasure. He is professional, trustworthy, and consistently delivers outstanding results. As a longtime Las Vegas local, he has an exceptional knowledge of the territory and truly understands the market. I highly recommend his services to anyone who is serious about growing their business!
k C. · Google
- ★★★★★
From what I've seen, Justin knows the AI automation space better than most people I've come across in Las Vegas. He's the kind of person who actually understands the technical side and can explain it without making you feel lost. Good guy, good reputation.
Afaryn F. · Google
- ★★★★★
I've Known Justin for a while now and he really knows his stuff when it comes to AI consulting. If people in Las Vegas were to ask me for recommendations in this space, he's the best guy for the job, hands down.
Mickey S. · Google
- ★★★★★
After going back and forth on whether to bring in outside help, we reached out to Justin for some AI consulting advice on where our service business could actually use automation. He was straightforward about what made sense and what didn't. Ended up being a useful conversation. Las Vegas has no shortage of people claiming to be experts, and he's one of the few who could back it up.
Vincent M. · Google
- ★★★★★
Known Justin for a few years now and the guy actually knows his stuff when it comes to AI automation. Friends in the Las Vegas service business space keep asking me who to call and I always point them his way.
Chris M. · Google
- ★★★★★
Justin is one of those guys who actually knows what he's talking about and doesn't cut any corners. Will definitely be working with him again.
David S. · Google
- ★★★★★
Justin knows what he's doing highly recommend using his service he will treat you right and give you tremendous value !👍
Gregory J. · Google
- ★★★★★
Known Justin for a many years and the guy actually knows what he's talking about when it comes to AI and automation. Not the type to just throw buzzwords around. Based in Las Vegas and well connected in the space. …
cindy D. · Google
- ★★★★★
Known Justin for a few years now. Guy knows the AI space better than most people I've come across, especially here in Las Vegas where there's no shortage of people claiming to be experts. He actually understands how AI automation works at a practical level, not just the theory. The kind of person who gives you a straight answer with kindness and patience
Katelyn H. · Google
- ★★★★★
Knew Justin before he started building AI systems for businesses, and watching what he's put together is genuinely impressive. He built out an AI automation setup for my website in Las Vegas and it changed how we handle leads completely. The guy actually runs this stuff himself, so he knows what works.
Justin E. · Google
Monitoring I Have Built
Work with logs and alerts you can read
Each link below goes to a live build or its case study. Each one shows a part of the monitoring approach described above, at the scale it was built for.
- Step 01
Automated business reporting
Scheduled jobs write a daily snapshot for each client, and routine alerts are batched into one digest rather than sent one by one.
- Step 02
Valhalla client portal
The client portal I run my own business on, where billing comes from Stripe and each task is tied to a project and a client.
- Step 03
Review Lite: review requests
A request goes out on a human click, and a fixed reminder schedule nudges anyone who has not replied yet.
API Integration Questions
Questions owners ask about APIs
API Development Las Vegas NV
Every part of the Valley, by ZIP code
Las Vegas
89030 · 89101 · 89102 · 89104 · 89106 · 89107 · 89108 · 89109 · 89110 · 89117 · 89124 · 89128 · 89129 · 89130 · 89131 · 89134 · 89138 · 89143 · 89144 · 89145 · 89146 · 89149 · 89166
Henderson
89002 · 89005 · 89011 · 89012 · 89014 · 89015 · 89044 · 89052 · 89054 · 89074 · 89120 · 89122 · 89123 · 89183
North Las Vegas
89030 · 89031 · 89032 · 89081 · 89084 · 89085 · 89086 · 89101 · 89115 · 89130
Summerlin
89128 · 89134 · 89135 · 89138 · 89144 · 89145 · 89148 · 89161
Spring Valley
89102 · 89103 · 89113 · 89117 · 89118 · 89146 · 89147 · 89148 · 89178
Paradise
89074 · 89102 · 89103 · 89109 · 89118 · 89119 · 89120 · 89121 · 89123 · 89158 · 89169 · 89183
Enterprise
89113 · 89118 · 89119 · 89123 · 89139 · 89141 · 89148 · 89178 · 89179 · 89183
Sunrise Manor
89104 · 89110 · 89115 · 89121 · 89122 · 89142 · 89156
Boulder City
89005 · 89044
Connected Builds
Pages that depend on an API
How an API Build Process Runs
Four steps from spec to handover
Each API build follows the same four steps. Each step ends with a document the owner can open, and nothing moves forward until the step before it is approved.
- Step 01
Write the contract
The endpoints, the fields, the error codes and the rate limits are written down and approved before any code is written.
- Step 02
Build and version
The API is built against the contract with a version number on every route, so later changes do not break the apps already connected to it.
- Step 03
Test the failure paths
Bad input, expired keys, timeouts and duplicate requests are tested alongside the normal path, with the expected response recorded for each.
- Step 04
Monitor and hand over
Logs and alerts are set up for each endpoint, and the owner receives the contract, the test record and a short runbook for the first month.
Proof, not promises
Case studies I can show you
The Spec-Site Factory: a finished website built before the first sales call
A Las Vegas web design system that builds your finished website from your own public data before the first call, then renders it on demand in under a second. See it, then make it live.
Read the case studyThe Full Website Audit That Crawls Your Whole Site and Scores It 0 to 100
A full website audit in Las Vegas: I crawl your whole site, delegate to specialist agents across technical, on-page, speed, schema, local, and AI search, and return one 0-to-100 health score with a ranked fix list.
Read the case studyMonty and the WebVegas Identity: a full logo family plus a clay Gila-monster mascot with a pose library and motion system
How I built a full logo family and Monty, a clay desert Gila-monster mascot with a pose library and motion system, so a local-service brand is remembered, not forgotten.
Read the case studyRelated services
The rest of the range
Describe Your Connection
Name the two systems first
Tell me which two systems need to talk, what each one sends and what should happen when a message fails, and I will reply with a written scope.