The article
Many businesses arrive at custom software the same way. The company runs on four or five subscriptions and a spreadsheet that holds them together; someone copies orders from one tool into another every evening, the reports never quite match, and the one process that makes the company different is the one no tool supports. That is the moment to talk to a custom software development agency, and also the moment to ask whether you should build at all.
I have spent 18 years in software development, and since 2017 my company, 26 Lines of Code, has grown to 70+ specialists and delivered 150+ projects across healthcare, fintech, logistics and e-commerce. We develop custom software around how a business works: web platforms, mobile apps and internal tools, from discovery to support. This guide covers when to build and when to keep buying, what we build, the two ways to work with us, how a project runs, what the price depends on, three products we worked on and what you own at the end.
Custom software development agency: the short version
| Question | With us |
|---|---|
| What we build | Customer portals and marketplaces, SaaS products and dashboards, internal tools that replace spreadsheets, iOS and Android apps, enterprise software with roles, audit and reports |
| Integrations | Stripe, Twilio, Auth0 and your own systems |
| Two ways to work | A full team runs your project, or our engineers join your team |
| Where the price starts | A first version of a web or mobile app from $5,000; most custom software gets an individual estimate, free, in writing, before any contract |
| How you pay | A fixed price for a settled scope, or time and materials |
| What you see | A demo of working software every two weeks |
| The contract | With our US company; the work is done by our team in Europe |
| The code | Yours once it is paid for |
Build or buy: when custom software beats a subscription
Build when the tools on the market force you to change the process that earns your money; keep buying when they do not. Most decisions get clearer row by row, so forward this table to whoever signs off on the budget.
| Look at | Keep the subscription when | Build custom software when |
|---|---|---|
| Your process | It works the way most companies in your field work | It is how you win, and the tool makes you work around it |
| Your data | It lives in one tool | People copy it between tools by hand every day |
| Your users | Your staff, with a few roles | Customers, partners and staff, each with their own rights |
| Your rules | Standard settings cover them | They need your own logic, an audit trail or reports no tool offers |
| Your systems | The tool connects to what you already run | Systems that do not talk to each other have to |
| The software's role | A tool you use | Part of what you sell, or of what the company is worth |
If most rows land in the middle column, keep the subscription and spend the money elsewhere. A mixed answer is common: keep the tools that work and build only the missing piece between them. When most rows land on the right, it is time to build custom software, and our first call is where we check that we are the right fit for it.
Custom developed software for the way you work
What we build depends on where the work happens:
- Customer portals and marketplaces: accounts, orders and payments for your clients, or for both sides of a market. More on custom web applications.
- SaaS products and dashboards: a product you sell by subscription, or the numbers your team checks every morning. More on web application development.
- Internal tools that replace spreadsheets: the process your team runs every day, with your rules built in.
- iOS and Android apps, with the backend behind them. More on mobile app development.
- Enterprise software with roles, audit and reports: who can see what, who did what and when. More on enterprise web applications.
- Integrations: Stripe for payments, Twilio for messages, Auth0 for sign-in, and your own systems.
The tools behind it have carried 150+ projects: React, Next.js and Vue on the front end; Django, FastAPI and Laravel on the back end; Swift, Kotlin, Flutter and React Native for mobile; PostgreSQL and Redis for data.
Custom software development outsourcing, or a team inside yours
The difference is who runs the engineers day to day.
- Outsource the project. A full team runs it end to end: discovery, design, development, QA and DevOps, on a fixed scope or by time and materials. You set the goal and the priorities and come to a demo every two weeks. The terms are on our IT outsourcing page.
- Add engineers to your team. Dedicated engineers or a whole squad join your process and report to your lead. The terms are on our staff augmentation page.
One question usually decides it: who will answer the engineers' questions at 10 in the morning? If it is your own technical lead, add people to your team. If nobody on your side can, hand us the whole project. Our short guide to outsource or outstaff has three more questions for the cases in between.
How a custom software project runs
Every project starts the same way, in five steps:
- Initial call. We learn your goals, requirements and timeline and check that we are the right fit. If you need an NDA, we sign it before you share the details.
- Questions and a rough estimate. You get a ballpark of time and cost to plan the next step, free.
- Agreement. Scope, budget and timeline are fixed in a contract.
- Discovery. Final requirements, the design and the technical approach, settled before the build.
- Build and release. Two-week sprints with a demo each time, then deployment and support.
Inside each sprint, the work follows one pipeline: requirements are written down before the code, the work is cut into small planned tasks with their own definition of done, each task is built with AI tools and checked against that definition, an engineer reviews the code, and our tester checks the result before it reaches you. A person works in a pair with AI on every task; AI takes the routine, and the architecture and design decisions stay with people. We do not train AI on our clients' code.
Your part: set the priorities, come to the demos and answer the team's questions. A step-by-step version is in from first call to first release.
What the price depends on, and how you pay
A first version of a web or mobile app starts at $5,000: the smallest version that proves the idea. Anything bigger, and most custom software, gets an individual estimate, free, in writing, before any contract. Every starting price we publish is on our pricing page.
The estimate follows what the software has to do:
- accounts and roles, payments or subscriptions, an admin panel;
- chat or real-time updates, AI features, maps and location;
- integrations with your CRM, ERP or other APIs, a marketplace of buyers and sellers, analytics dashboards, several languages;
- and where you start: an idea, ready designs, or an existing product that needs new features or a rebuild.
Then you choose how to pay:
| Fixed price | Time and materials | |
|---|---|---|
| Fits when | The requirements are settled before the build | The product will change as you learn |
| Agreed before the start | Scope, budget and timeline | A rough estimate, refined in discovery |
| What you pay | The agreed price: the total for the agreed scope cannot exceed it | The time actually spent |
| The risk of underestimating | Mostly ours | Yours, so the demo every two weeks is your control |
| Something new halfway through | Its own estimate and your approval before we build it | Estimated and agreed before it is scheduled |
Custom software builders differ less in the code they write than in what they put in writing before work starts. In October 2026 I read the pages Google shows for this search: its first page is mostly directories, a forum and a map of local studios. Of the three studio pages I measured, none prints a single price, and none says in plain words who owns the code once the client has paid. Three pages are a small sample, but those are the two questions I would put to any custom software development firm first.
Start with a first version that proves one thing
A first version is the smallest piece of the software that shows the idea works with real users. Three cuts usually get it there:
- One group of users. Your own team before your customers, or one side of a marketplace before the other.
- One workflow, end to end. The order that today travels through three tools by hand, from the first click to the report.
- One integration that matters. The system the data has to reach first; the others can wait.
Everything the first version leaves out stays in the backlog, and each piece gets its own estimate before we build it. You decide on the rest with numbers in hand and with users already working in the software.
Three products we worked on
- PBM Source: new laws become tasks. Compliance software for pharmacy benefit managers. New laws, regulations and guidance land on a dashboard as tasks with a summary, a jurisdiction and a date, and the team assigns them, with every message and document in one place. The hard part was showing each team only what applies to it: every requirement is marked by line of business, such as fully insured commercial, self-insured, Medicare or Medicaid. Built on Django and React with PostgreSQL.
- RxPhoto: one record per patient. Clinics capture patient photos on a phone or a tablet and keep each patient's photos, forms and notes in one record on a secure cloud portal, with an audit log of user actions; per rxphoto.com, more than 80 million before-and-after photos are stored there. We worked on the backend, the web front end and the API behind the mobile app, including patient reports that export to PDF, JPG or PowerPoint, and we support the platform for the practices that use it every day.
- AAE Plugin: from a demo to a product. An AI plugin that lets artists generate and edit images and short video fragments without leaving Adobe After Effects. We took it from a technical demo to a product: in-painting with masks, licensing by subscription tier and an admin that sees every task. The hard part was cost: models change fast and GPUs are expensive, so the backend swaps models without a plugin update and runs GPU workers on demand, with no idle hardware to pay for.
What you own when the work is done
The code and the design made for your project are yours once they are paid for. When clients ask me who owns the code, my answer is short: whoever paid for it.
Because requirements are written down before any code, a document of what your software must do exists before the first sprint. The next developer, ours or anyone else's, starts from it rather than from someone's memory. Before you hire a custom software development company, ours included, ask for both answers in writing: when the code becomes yours, and where it will live.
After launch
Software that runs a business needs looking after even when nobody changes it. Libraries and frameworks release new versions, services like Stripe or Twilio retire old versions of their APIs, and sooner or later something breaks. The team that built your software can keep it running for a monthly price set after a review: fixes, updates and answers from engineers who know the code. New features come from the same team, each estimated before work starts. More on software maintenance.
Tell us what the software has to do. The estimate is free, and on weekdays, from 9 am to 6 pm Miami time, a new request gets a reply within 30 minutes.