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Custom Software Development

Custom platforms, internal tools and APIs built by senior engineers — with AI capability designed in from the start rather than bolted on two years later.

200+
projects delivered
Practice area
Custom Development

Software built for the decade, not the demo

Custom software is worth building when off-the-shelf tools force your business to work the way the vendor imagined rather than the way it actually works. That is a real and common situation — but it justifies custom development only if what gets built is maintainable long after the original team has moved on.

We optimise for the engineer who inherits the codebase in three years. Conventional patterns over clever ones, meaningful test coverage on the paths that matter, documented architecture decisions, and dependencies chosen for longevity rather than novelty.

  • Senior engineers only — no junior resourcing hidden behind a PM
  • Conventional, readable architecture over clever abstractions
  • Meaningful test coverage on business-critical paths
  • Documented decisions, so future maintainers understand the why
  • Your repository from commit one

AI-native from the foundation

Software written today will be expected to do intelligent things tomorrow. Systems built without that assumption tend to need expensive retrofitting — the data model has no room for embeddings, there is no event stream to learn from, and business logic is tangled through the interface layer.

We design the data model, the event architecture and the service boundaries so that AI capability can be added later without a rewrite. Even when the current scope contains no AI at all, the foundation is ready for it.

What we build most often

Internal operations platforms replacing spreadsheet-and-email processes, customer-facing portals, B2B SaaS products, data platforms unifying scattered sources, and integration layers connecting systems that were never designed to talk to each other.

  • Internal operations and admin platforms
  • B2B SaaS products with multi-tenancy and billing
  • Customer portals and self-service platforms
  • API and integration layers between existing systems
  • Data platforms and reporting infrastructure

What you receive

  • Production application deployed to your infrastructure
  • CI/CD pipeline with automated testing
  • API documentation and architecture records
  • Handover sessions with your engineering team
  • Full source code ownership and IP assignment

Technologies we use

Next.jsReactNode.jsPythonFastAPILaravelPostgreSQLRedisDockerAWSGitHub Actions

Custom Software Development — frequently asked questions

How much does custom software development cost?

A focused internal tool typically runs $20K to $45K. A full B2B SaaS platform ranges from $60K to $180K depending on integration count and compliance scope. We quote fixed scope after discovery rather than billing open-ended hours, so budget certainty sits with you.

Do you work fixed-price or time-and-materials?

Fixed scope and fixed price for defined deliverables, which is what most clients want for budget certainty. For longer or evolving engagements we run dedicated-team retainers with a fixed monthly rate. We do not run open-ended hourly billing.

What happens after launch?

You own the code and can take it in-house immediately — that is the point of clean handover. Most clients keep us on a support retainer covering bug fixes, dependency updates, security patches and feature work. Others hand over entirely to their internal team, which is a perfectly good outcome.

Can you take over an existing codebase?

Yes, and it is common. We start with a paid technical audit that maps the architecture, identifies risk, and gives you an honest assessment of whether the code is worth continuing with or whether a staged rewrite is cheaper over a two-year horizon.

How do you handle scope changes mid-project?

Changes are quoted as separate, clearly-priced change orders rather than absorbed silently into the timeline. You decide whether each one is worth the cost and the schedule impact before anything is built.

Related services

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AI Development
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MVP · Launch
Web App Development
Web · Product
AI Integration Services
AI Integration

Talk through your custom software development project

A free 30-minute call with an engineer — not a salesperson. You leave with a scope, a cost range and an honest view of the risks.

Book a free strategy call
Cloud & AI Partners

We build on the platforms enterprise teams already trust

Amazon Web Services
Google Cloud
Microsoft
Microsoft Azure
OpenAI
Anthropic

Zeebrix builds production AI on AWS, Google Cloud, Microsoft Azure, OpenAI, and Anthropic Claude. Logos and trademarks are the property of their respective owners.

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