I’m Allen Mackley, an independent software engineering consultant. I work remotely, alongside your engineers or on my own, on AI and MCP integrations, payments, and web and mobile apps. I can also take on an app end to end, from planning through production.
20yearsbuilding software
Engineering work with teams at
cmiVFX · cmiUniverse
Grow.com · Epicor
Jolt Software
foreUP Golf Software
Connect Applications Integrated
La Grande OnlineI’ve built software in these areas for 20 years, at companies and on my own products. I can join your team on a roadmap item, take on a backlog your team hasn’t had time for, or take on an app end to end.
I build MCP servers and agent workflows that connect AI assistants to real products. Tabularia’s connector lets ChatGPT and Claude read, propose, and make changes in a manuscript, with authentication, drafts, and snapshots to keep the work safe.
Checkout, invoicing, payouts, refunds, and failed payments. I built payment processing at foreUP, subscriptions at cmiVFX, and PaySegue, which sends invoice payments directly to service providers through Stripe Connect.
React, React Native, and PWAs that keep accounts and data in sync across devices. As technical lead at Grow, I brought the mobile business intelligence app closer to the web experience, including live data updates.
Software for businesses that run on schedules, checklists, and reservations. I worked on task and food-safety systems at Jolt, golf-course operations at foreUP, and booking and calendar tools for vacation rentals.
Connecting products to the systems around them, from ERP integration with Epicor to partner APIs for an app marketplace. I find what is slowing a system down and change how it is built so it holds up as usage grows.
Code review, tests, CI/CD, and controlled releases, with a plan to recover when something goes wrong. I work in your repository and follow your team’s process, and I pay attention to access controls and customer data.
Tell me what your team is building or where it’s stuck.
Let’s talkTwo products I designed and built end to end, and continue to develop.
Revise a whole book without losing context.
7+ months of sustained development to build and launch Tabularia.
Writers need to change a passage without losing sight of the book around it. I built Tabularia to keep manuscript structure, related passages, and revisions connected as the work changes.
Simple invoicing for independent businesses.
4+ months of sustained development to build and launch PaySegue.
Preparing an invoice, taking payment, and knowing what still needs attention belong to the same business workflow. I built PaySegue to connect those steps for the business and its clients.
Selected problems I’ve worked through for clients and engineering teams, from mobile apps to marketplaces and booking systems.
Grow.com · Epicor
Team contribution
Customers needed useful business intelligence on the move. I improved and repaired Grow’s mobile app, including live data updates, and worked across frontend, backend, and DevOps to connect it with the wider system.
Read the case studycmiVFX · cmiUniverse
Consulting client · Mackley Studios
A training marketplace connects instructors, content, subscriptions, and payments. As a consultant through Mackley Studios, I rebuilt cmiVFX’s profit-sharing marketplace and modernized its subscription and payment services.
Read the case studyNaples Florida Vacation Homes
Consulting client · Mackley Studios
A reservation brings availability, dates, pricing, and payment together. I built vacation-rental booking tools and customized calendar and payment workflows, connecting the booking experience to the business’s rental system.
Read the case study“Allen is a great developer who really seeks to fully understand not only his craft, but why something is being built and how it affects customers. He is a person who dives into knowledge about what is happening in the industry mainly on his own time and I got to enjoy the TLDR of his efforts.
If you are looking for a full stack developer who knows his stuff Allen is your guy.”
“Allen did a great job on application development for MoneySlinger. We had unique JavaScript interface requirements for a datagrid which had to function well across multiple browsers. Very satisfied with the end result.”
“Allen is a great guy first of all, great attitude and he totally loves what he does. I have the pleasure to work with him and I can't think of anyone better for making web apps happen”
“Allen has been a key factor in the restoration of a previously damaged series of web applications … and is an asset to quality control.”
A monthly contract for senior engineering work. I can join your team in your repository, tools, and process, or take over development of an app end to end. We agree on scope and priorities up front, and I carry the work through to production.
Start with a short call about your product, your team, and where you need help. We agree on capacity, pricing, and contract terms in writing, including any vendor onboarding your company requires.
We define the next milestone and its priorities. I do the development work in your existing workflow, or set one up if you need it, so requests, decisions, and progress stay visible.
Follow updates and demos, try the result, and leave feedback to guide the next step.
Software engineering & consulting
$16,000–
Depending on the scope, complexity, and level of involvement your product needs.
Hands-on engineering from someone who takes responsibility for the result. We agree on the goals and work toward milestones your team can try and review.
Need more engineering capacity, or someone to take over an app?
Tell me what you’re working on and what’s getting in the way. Whether it’s work alongside your engineers or an app to take on end to end, I’ll help you work out the next step.
[email protected]I care about why something is being built and how people will use it. Working across design and engineering lets me follow those questions through to the finished software.
I’m based in the Pacific Northwest of the United States. Software is one part of my creative life. I also write fiction and compose music. I’m learning Latin, and I enjoy cycling.
I’m writing The Fathom, a fantasy novel with a world and characters I’ve spent years developing. Through Story First Audio, I work on music composition, recording, and audio production.
