GPA Teknoloji

Custom Software

Custom Software Development

We build web apps, operations panels, customer portals and reporting products around your business model.

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Product screens, code repository and API architecture visual for custom software development

When is custom software the right investment?

Packaged software does not always fit — sometimes the process bends to the tool, sometimes the tool has to bend to the process. We start from the real business rule, then the technical design. Frontend, backend and data layer are built with the same discipline, with testing and deployment in scope.

We choose technology based on need, not trend: expected user volume, data scale and budget determine whether a monolithic or service-based architecture — and which infrastructure — is the right call. Version history lives in Git, every change runs through automated tests, and a pre-deployment checklist is applied before release.

Where we move you

Today

  • Business process gets forced into packaged software
  • Data gets lost between spreadsheets and email
  • Reporting is stitched together manually

After this service

  • Software shaped to the process, scoped to real need
  • One reliable source of truth
  • Live, automatically generated reports

How we work

01

Product analysis and technical design

We turn this item into a concrete work package with owner, acceptance criteria and measurement point.

02

Frontend, backend and data layer development

We turn this item into a concrete work package with owner, acceptance criteria and measurement point.

03

Testing, deployment and maintenance

We turn this item into a concrete work package with owner, acceptance criteria and measurement point.

04

User documentation

We turn this item into a concrete work package with owner, acceptance criteria and measurement point.

Product screens, code repository and API architecture visual for custom software development

Product + architecture + scalability

When off-the-shelf software is not enough, we fit software to the business

Custom software is not just screen development. Business rules, data model, integration, security, maintenance and user experience are designed together.

Research

Where does custom software create value?

As companies grow, packaged software may not cover the whole operation. Good custom software reduces manual tracking, unifies data and turns unique business rules into a sustainable product.

Operating model

The structure we design in custom software projects

For software to last, product ownership, code quality, data security and maintenance model must be clear from day one.

Layer
What is designed?
Common mistake
GPA approach
Product scope
User roles, workflows, screens and acceptance criteria
Every request enters development scope
MVP, phased plan and value priority
Technical architecture
Frontend, backend, API, database and infrastructure choices
Short-term code turns into maintenance load
Scalable architecture decision record
Data model
Master data, transactions, logs, reporting and retention policy
Data is treated as something to fix later
Reportable data design
Integration
ERP, CRM, payment, e-invoice, warehouse, banking and external services
File transfer is treated as a permanent solution
API-first integration plan
Maintenance
Release, testing, monitoring, support and security updates
The project is seen as finished at go-live
DevOps and support operating model

Roadmap

How we build custom software

Releasing fast matters, but making future change manageable matters just as much. We run development with product discipline.

01

Weeks 1-2

Discovery and product definition

Users, business rules, data sources, success criteria and MVP scope are clarified.

02

Weeks 3-4

UX and architecture design

Screen flows, data model, API boundaries, security needs and technology choices are set.

03

Weeks 5-10

Development and testing

Sprint delivery, demo, code review, automated tests and user acceptance steps are run.

04

Weeks 11-12

Go-live and maintenance

Release plan, monitoring, user training, support channel and improvement backlog are activated.

Which KPIs measure custom software success?

User adoptionKPI
Manual work reductionKPI
Release frequencyKPI
Defect escape rateKPI
API response timeKPI
Maintenance effortKPI

Development process by the numbers

8-12 weeks

Typical first release timeline

On every release

Code review and test coverage

Frequently asked questions

Do you build from scratch or extend an existing system?

Both. Most projects add a module to an existing system; we only recommend a from-scratch build once it is clear the packaged option genuinely does not fit.

Let's talk about this service

Tell us briefly what you need, and we'll scope the right approach together.

Get in touch