What is custom software development?
Custom software development is the design, build, and ongoing maintenance of an application created for one organisation rather than sold as a licensed product to many. The requirements come from your processes, your data, your integration surface, and your regulatory obligations, and the resulting source code and infrastructure belong to you.
When is custom software a better choice than an off-the-shelf product?
Custom software is usually the better choice when your process is a genuine differentiator, when the workarounds around a packaged product have themselves become part of the process, when integration or data ownership requirements cannot be met by the licensed option, or when per-seat costs are growing faster than the value being delivered. If a mature product covers your need with minor configuration, we will tell you so rather than build a replacement.
How is this different from your web development and mobile app development services?
Those pages describe delivery in a specific channel. Web development covers browser-delivered builds and mobile app development covers iOS and Android. This page covers the wider case where the product spans several channels, replaces or extends an existing system, or is defined by back-office workflow and integration rather than by a single front end. Many custom projects include web or mobile work as components.
How does this relate to your ERP, CRM, and ecommerce solution pages?
Those solution pages cover well-defined system categories where established platforms exist and are often the sensible starting point. This page covers software with no clean packaged equivalent. If your requirement turns out to be a standard ERP or CRM need, we will point you to the relevant solution page rather than build the category from scratch.
Who owns the source code and the intellectual property?
You do. Ownership of the source code, infrastructure definitions, pipelines, and documentation transfers to you, and this is set out in the contract before work begins. You receive repository access from the start of the engagement rather than at the end.
How long does a custom software project take?
It depends on scope, integration count, and data migration complexity, so we do not publish a standard duration. What we do commit to is a detailed estimate within 48 hours of a scoping conversation, covering team composition, phases, timeline, and cost breakdown, with the assumptions that drive each figure stated so you can challenge them.
Can you modernise or replace an existing legacy system?
Yes. Legacy modernisation is a common engagement type. Depending on the risk profile we use progressive replacement, where new capability is built alongside the old system and traffic is moved across in stages, or a rehearsed full cutover where a clean break is achievable. Legacy data is profiled, cleaned, mapped, and reconciled as part of the plan rather than treated as a final task.
How do you handle integration with our existing systems?
Integration is scoped during discovery and treated as a first class requirement. We inventory every system that must connect, agree the contract and data ownership for each interface, and design for the failure cases: retries, idempotency, reconciliation, and monitoring. Where a broader integration layer is the main deliverable rather than a component, our API development solution covers that work directly.
What engagement models do you offer?
Custom software can be delivered as a fixed-scope project, as a dedicated development team working to your backlog, or as an offshore extension of your existing engineering function. Our dedicated development team and offshore development pages describe the staffing arrangements in detail; the choice of model does not change the ownership terms.
Is AgileTech Vietnam certified for custom software delivery?
Our quality management practices are verified by ISO 9001:2015 and our information security management practices are supported by ISO 27001:2013. AgileTech Vietnam has also been named a Top App Developer in Vietnam by Clutch.co and holds a 4.9 out of 5 rating on Clutch.
How do we get started?
Share an outline of the problem, the systems currently involved, and the outcome you need. We will arrange a scoping conversation, and within 48 hours of it you receive a written estimate covering scope, team composition, engagement model, timeline, and cost breakdown. There is no charge for that stage.