Custom Software, One Tested Sprint at a Time
SprintOne Labs builds custom software in two-week sprints, with QA engineers working inside each sprint, and offers custom software development services for web apps, SaaS products, internal and enterprise systems and integrations to founders, CTOs and product leads at startups, SaaS companies and agencies. As a custom software development company, we hand over a tested increment once per sprint, and autotests check each build. Our software development services run as a fixed-scope project or as a team extension, and all of these custom software development solutions start from a scoped estimate.
What 'Tested in Every Sprint' Means in Practice
Every sprint ends with working software you can click through. A QA engineer joins that sprint at planning and stays until the demo. Testing is never a phase parked behind the last feature.
Three layers of checks run at three different rhythms.
On every build
- Unit tests on the code that changed
- API tests on each endpoint a feature touches
- UI autotests on the critical user flows
The pipeline starts this suite on each commit. A red result blocks the merge. Nobody debates whether a broken build may ship.
Inside every sprint
- Test cases drafted while the story is still being coded
- Manual exploratory sessions on each new feature
- Code review on every pull request
- Defects fixed in the sprint that produced them
Exploratory work finds what scripts cannot predict: odd input, half-finished flows, confusing states. Those findings turn into new autotests. Coverage grows with the codebase instead of trailing it.
Before every release
- Full regression across the web application
- User acceptance testing on a staging copy of production
- A release note stating what passed and what stays open
Who does the testing
Developers own unit tests for the code they write. The sprint's QA engineer owns API and UI autotests plus every exploratory session. Both roles read each other's pull requests, so test code is reviewed like product code. Nobody outside the sprint signs off on quality afterward. The people who built the increment are the people who prove it.
Numbers we track
Two figures tell you whether the method holds. Ahead of each release, >97% of critical defects have already been found. With regression automated, a manual pass of up to 3 days shrinks to 1–2 hours. For a SaaS team releasing every two weeks, those recovered days go straight into feature work.
Few custom software development companies describe their test strategy beyond a single word in a process diagram. We publish ours because the whole calendar further down depends on it.
What Are Custom Software Development Services?
Custom software development services are the work of designing, building, testing, deploying and maintaining software made for one company's requirements. The product follows your workflow, your data and your integrations. Off-the-shelf products do the opposite: one package, sold to many buyers, configured within fixed limits.
Custom software vs off-the-shelf is a question of fit and long-run cost. Building wins in these cases:
- Workflow as differentiator. Your process is the thing customers pay for, and no packaged tool models it.
- Integrations. Several systems must exchange data, and connectors from the vendor stop short.
- Licence arithmetic. Per-seat fees climb with every hire until they exceed the price of owning the code.
- Control. Roadmap, security rules and hosting need to be your decision.
Buying wins when the process is standard: payroll, email, a basic help desk. Many software development solutions mix both, with bought tools at the edges and custom code at the core. If a licence solves your problem, we say so during discovery.
What full-cycle development covers
Full-cycle development means one team carries the product through every stage. Discovery turns an idea into requirements. UI/UX design and architecture turn requirements into a plan. Sprints turn that plan into code, and QA runs beside the coding. Deployment puts the result in front of users. Maintenance keeps it healthy afterward. You can also order a single stage, such as an architecture review ahead of an in-house build.
What We Build
Seven kinds of work cover most requests we receive. They can be ordered one at a time or combined under a single sprint plan as full-cycle software development services. Every card closes with the way that work gets tested.
Web Application Development
Front ends are written in React, Next.js and TypeScript; back ends in Node.js, .NET or Python. Your web application grows by one usable slice per sprint, and responsive layouts prepare the ground for a later mobile client. UI autotests replay each critical flow whenever the code changes.
SaaS Product Development
Multi-tenant data, subscription billing and self-serve onboarding are designed in from Sprint 0. Our software product development services treat tenant isolation as a feature with its own backlog stories, not as an afterthought. Tenant-boundary and billing scenarios are exercised as API tests in each sprint.
MVP Development for Startups
MVP software development services cut an idea down to the smallest product that can prove demand. A first clickable increment lands after Sprint 1, and the backlog is reshaped from real feedback instead of assumptions. Even an MVP leaves our hands with smoke autotests around its core flow.
Cloud-Native Development and API Integrations
Services run in containers on AWS, Azure or GCP, with infrastructure described in Terraform. Cloud software development services also cover third-party APIs for payments, CRM, identity and data feeds; AI features plug into that same integration layer. Contract tests guard each API, so a vendor's change fails in the pipeline first.
Enterprise and Internal Systems
Typical builds here are workflow tools in the ERP and CRM family, approval chains and reporting dashboards. Enterprise software development services add role-based access, audit trails and single sign-on. Custom enterprise software development gets a permission matrix, verified role by role with automated checks.
Legacy Modernization and Re-Engineering
Aging Java or .NET monoliths move to a maintainable architecture one module at a time. The old system keeps serving users while its parts are replaced. Characterization tests capture current behavior beforehand, and every rewritten module is compared against that record.
Software Development Consulting
Software development consulting services come in three sizes: a discovery phase, an architecture review or a tech audit of an existing codebase. The output is a written report with risks ranked by impact. Our findings include a coverage map showing which parts of the reviewed code have tests and which have none.
Our Sprint Calendar: From Sprint 0 to Release
Dates beat phase names. Our custom software development process is laid out as a calendar, so you know what exists at the end of each entry. Agile here means fixed two-week sprints and a demo you can attend.
- Sprint 0, opening days — Discovery. We map goals, users, constraints and the systems already in place. Requirements are written as user stories with priorities. Unknowns get listed as questions with owners, not buried in assumptions.
- Sprint 0, midpoint — Acceptance criteria. Each feature receives a short statement of what "done" means and how it will be measured. You approve that statement in writing. Later sprints are judged against it instead of against timesheets.
- Sprint 0, closing days — Architecture and UI/UX design. The tech stack is chosen for your team's skills and your scalability needs. Clickable prototypes show the main screens. The repository, the CI/CD pipeline and a staging environment are created under your accounts.
- Sprint 1 — First tested increment. Developers and a QA engineer take the highest-value stories together. Automated checks fire on each push. At the demo you use a working slice of the product on staging.
- Sprint N — Release. Regression runs across everything built so far. Your team performs UAT, then deployment goes through the same pipeline that served staging. A rollback path is checked before the switch.
- After release — Support and evolution. Monitoring watches the live system. Maintenance and support requests enter the same backlog as new features. The calendar simply continues with the next sprint.
Between Sprint 1 and Sprint N, each sprint repeats one pattern.
| Sprint slot | Developers | QA engineer |
|---|---|---|
| Planning, first morning | Estimate stories, split tasks | Challenges vague requirements, drafts test cases |
| Week 1 | Code the first stories, open pull requests | Writes API and UI autotests for those stories |
| Week 2 | Finish stories, fix reported defects | Runs exploratory sessions, confirms fixes |
| Demo, last afternoon | Present the increment | Reports what passed and what was deferred |
Security review and performance checks are scheduled as stories inside this calendar. They are not postponed to a hardening phase. A custom software development agency that plans them late usually ships them late.
What you can see at any moment
Visibility is part of the calendar. Four things are open to you from Sprint 1:
- The board, with each story's status
- The repository, with every pull request and its review
- The pipeline, with the latest build result
- The staging environment, with the newest increment
A status meeting adds little when those four are current. Questions go into the shared channel and are answered by the engineer closest to the code.
Security, scalability and maintainability in the plan
Security starts in Sprint 0 with decisions on authentication, roles and data storage. Dependency updates and secret handling are pipeline jobs, not manual chores. Scalability is addressed in the architecture: stateless services, a database sized for projected load and a cloud-native layout that grows by adding containers. Maintainability comes from code review, consistent structure and tests that document intended behavior. A new developer can read the suite and learn what the system must do.
Custom Software Development Cost by Project Type
Budgets depend on project type first, so the table starts there. Its figures are a typical US market range for each type. Treat them as industry context, not as our quote.
| Project type | Typical scope | Typical US market range | Timeline |
|---|---|---|---|
| MVP / proof of concept | One core flow, one user role, basic admin | $25k–$80k | 2–4 months |
| Mid-size web or SaaS product | Several roles, billing, integrations, reporting | $80k–$250k | 4–8 months |
| Enterprise / multi-system platform | Many integrations, compliance, data migration | $250k+ | 8–14 months |
One sprint, priced
We quote in sprints instead of handing you a rate card. Here is the arithmetic for a small product team:
- 1 developer, full time: $65–75/h × 80 h
- 1 QA engineer, half allocation: $40–45/h × 40 h
- Two-week sprint total: ≈ $6,800–$7,800
An automation engineer, when the codebase needs one, bills at $45–55/h. Seniority, stack and time-zone overlap decide the final rate. No minimum project size applies, so a codebase audit or one feature is a valid first order.
Multiply that sprint by the length of your roadmap and a working budget appears. As a custom software development company, we prefer showing the sum to hiding it behind a form.
What moves custom software development cost
- Scope clarity. Vague requirements produce rework, and rework is paid twice.
- Integrations. Each external API adds contract tests, error handling and a vendor's release schedule.
- Compliance. Regulated data brings audit trails, access rules and extra review.
- Team composition. A senior-heavy team costs more per sprint and often needs fewer sprints.
Where test automation pays back
Autotests cost effort in the first sprints and save it in every later one. Payback typically arrives within 3–5 releases once regression runs on every build. After that point, each release of your SaaS product or web app is checked by machines while people work on new features. A larger suite is its own project; our QA automation page covers it.
Pricing models
Fixed price fits a scope that will not change: you get a quote per milestone. Time and materials fits a product still being discovered: you pay per sprint and reorder the backlog freely. A dedicated team is billed monthly and suits a roadmap with no end date.
Ways to Work With Us
Three formats exist because roadmaps differ. The sprint rhythm and the test layers stay identical in all of them.
Fixed-Scope Project
Suited to a defined product or feature set. Acceptance criteria are written per milestone, and each milestone payment follows its demo. Scope changes go through a short written change request, so the budget never moves silently.
Dedicated Team or Team Extension
Suited to a company that already has a product and a backlog. Our developers and QA engineers join your sprints, your tracker and your code review within 3–5 business days. They report to your lead. Capacity goes up or down with the roadmap, and nobody re-signs a contract for it. Terms are on the staff augmentation page.
Outsourced Product Development
Suited to a founder without an engineering team. We run the product end to end, from Sprint 0 discovery through release and support. Software development outsourcing often fails on visibility; here you attend every demo and read the same board the engineers use. Outsourcing software development to us still leaves product decisions with you.
Choosing among the three
A fixed scope protects a fixed budget. Team extension protects a roadmap already in motion. Full product outsourcing protects a founder's time. When requirements are still moving, start on time and materials for Sprint 0, then fix the scope once discovery has settled it. Pipeline and hosting work can be added to any format through our DevOps engineers.
Ownership in every format
All code and IP belong to you. Repositories and cloud accounts are opened in your company's name on day one. An NDA is signed before discovery begins, so your idea is covered before we see a single document.
Why SprintOne Labs
Speed means little if every release breaks something older. Four habits keep our pace and our quality in one line.
QA in Every Sprint
A tested increment ships every two weeks, with autotests on every build. Critical defects are found before release in >97% of cases. Your web app gains features without a growing list of regressions.
Acceptance Criteria Before Code
"Done" is written down for each feature before development starts. You evaluate the increment against that text, not against hours. Scope arguments are settled in Sprint 0, when they are still inexpensive.
Direct Engineer Contact
One shared channel holds your team and the engineers who write and test the code. The company was founded by a QA engineer with 7+ years in testing, and one engineer on the team is ISTQB-certified. Technical questions reach a technical person.
Team Extension Without Paperwork
Need another developer for a heavy quarter: the engineer is inside your sprint in 3–5 business days. Scaling back works the same way. For a custom software development agency, that flexibility replaces a new contract with a message in the channel.
Technologies We Build With
Tooling on our projects is chosen for one job: proving each build before it moves. UI and API autotests are written in Playwright + TypeScript or Cypress. GitHub Actions runs them on each commit, inside Docker containers that match the production image. Allure turns the results into a report anyone on your side can read. The product itself is typically built with React, Next.js, Node.js, .NET or Python and hosted on AWS, Azure or GCP, which is the footing for our cloud software development services. Kubernetes handles orchestration where scale requires it.
Free QA Audit in 2–3 business days
Before any sprint is sold, we look at the release cycle you have now. The audit asks one thing about your product: where can a defect travel from a commit to a customer unnoticed.
What we check in your release cycle:
- QA process, from the moment a feature is specified to its deployment
- Coverage of the business-critical flows in your web app or SaaS product
- Existing automation: which checks exist, how they run and how well they catch failures
- Next candidates for automation in your codebase
- Main gaps and risks for the coming releases
The deliverable is a short written report with findings, risks and recommendations. You receive it within 2–3 business days of giving us access and product information. There is no obligation after it. Some teams fix the listed gaps themselves; others ask us to turn the report into a Sprint 0 plan.
FAQ
What are custom software development services?
Custom software development services mean a team designs, codes, tests, deploys and maintains an application for a single business. Nothing is shared with other buyers. At SprintOne Labs the build moves in two-week sprints, and a tester works in each one. You see a checked increment at every demo and steer the backlog from there.
How much does it cost to develop custom software?
Cost follows project type and team size. A typical US market range runs from $25k–$80k for an MVP to $250k+ for an enterprise platform. Our own unit is the sprint: one developer plus a half-time QA engineer for two weeks lands near $6,800–$7,800. Count the sprints on your roadmap to get a first budget figure.
How long does custom software development take?
Timelines scale with scope. Typical market timelines are 2–4 months for an MVP, 4–8 months for a mid-size web or SaaS product and 8–14 months for a multi-system platform. With sprint delivery you do not wait for the end. The first tested increment arrives after Sprint 1, and something usable follows each fortnight.
How do I choose a custom software development company?
Ask each candidate how testing fits into its delivery, then compare the answers. Look for QA inside the sprint, automated checks in the pipeline, written acceptance criteria and direct access to engineers. Check who owns the repository. A vendor that demos working software every two weeks gives you evidence early, before most of the budget is spent.
Who owns the code and intellectual property?
You own everything we write for you: source code, designs, documentation and all intellectual property. Repositories sit under your organization's account from the first commit. An NDA is signed ahead of discovery, so product details are protected even if no project follows. If we part ways, the codebase stays exactly where it always was.
Can you take over an existing codebase or work with our in-house team?
Yes to both. For a takeover, we begin with a tech audit of the codebase and add characterization tests before changing anything. For joint work, our developers and QA engineers enter your sprints, tracker and review process in 3–5 business days. Team size can change later without a new agreement.
How do you make sure the software works before release?
Three layers of checks stand between a commit and production. Unit, API and UI autotests run with each build. A QA engineer explores every new feature during the sprint. Full regression and user acceptance testing precede deployment. An e-commerce checkout before peak season, for example, gets load scripts added to that list.