Get Appointment

Custom Full-Stack App Development — Security Built In from Day One

Smahh builds web and mobile applications that work reliably, scale with your business, and do not become a security liability six months after launch.

Get A Free Consultation View All Services

Why most custom software fails to deliver after launch

The hidden cost of building apps without security in mind is staggering. Most development agencies build fast and defer security testing until the end. A penetration test after launch often reveals critical architectural issues that are incredibly expensive and time-consuming to fix. You are left with a system that is fundamentally vulnerable.

Furthermore, apps built without rigorous architecture planning become unmaintainable very quickly. Within months, adding new features takes weeks because the codebase is a convoluted mess of spaghetti code. You end up fighting your own application rather than building value for your users.

Offshore or low-cost agencies often deliver something that technically runs but cannot be easily understood, extended, or supported by a local team. The code quality is poor, documentation is non-existent, and the transfer of ownership is messy at best.

Smahh's position is clear: we are not the cheapest option, but the businesses that come to us after a bad experience elsewhere all tell us the same thing — they wish they had done it right the first time. We build applications with security, maintainability, and scalability engineered in from the very first sprint.

What our full stack development covers

SaaS platforms and web applications

We build business-facing web apps, customer portals, internal tools, and comprehensive SaaS products. We use React or Next.js for the frontend, Python or Node.js for the backend, and PostgreSQL or a cloud-native database. A full CI/CD pipeline is included as standard, ensuring smooth, automated deployments.

Mobile app backends

We develop robust REST and GraphQL APIs serving iOS and Android applications. This includes secure authentication, push notifications, in-app purchases, and real-time features. Our APIs are specifically designed for mobile usage patterns — prioritising low latency, offline tolerance, and highly efficient data payloads.

Admin panels and internal tools

We create secure operations dashboards, data management interfaces, and reporting tools. These are built with your team's specific workflows in mind, not forced into a generic, clunky template. We use clean architecture so your own developers can easily extend it themselves in the future.

Integration and API development

We connect your product to critical third-party services like payment providers, CRMs, ERPs, and government APIs. We handle complex webhook flows, OAuth authentication, and heavy data transformation layers. Reliability and robust error handling are treated as first-class concerns.

Legacy application modernisation

We assess and incrementally replace legacy systems — carefully moving from brittle monoliths to modern microservices, migrating from on-premise to the cloud, and transforming fragile manual processes into reliable automated ones. This is done incrementally so the business never has to stop operating.

Why work with Smahh

Security is the foundation

Smahh's team includes cybersecurity consultants. Before we write the first line of application code, we threat-model the architecture. Authentication, authorisation, data handling, and API design are all reviewed against real attack patterns. Applications leave our hands ready for a penetration test.

You own everything we build

Full source code, architecture documentation, and infrastructure definitions are handed over at the end of every project. No lock-in to Smahh tooling, no black-box systems, and no forced dependency on us for ongoing development unless you want it.

We work across ANZ

We are a remote-first team that has delivered major projects for businesses across Auckland, Wellington, Sydney, and Melbourne. We intimately understand the regulatory environment (Privacy Act 2020 in NZ, Privacy Act 1988 in Australia) and build compliance in from the start.

How we work

Step 01

Discovery

Workshops to understand your users, workflows, and business goals. Output: a product requirements document and architecture proposal.

Step 02

Security architecture review

Comprehensive threat modelling, data classification, and auth permissions design before writing any code.

Step 03

Design

Detailed UX wireframes and high-fidelity UI design. You approve everything before the build phase starts.

Step 04

Build

Iterative delivery in strict 2-week sprints. Staging environment is live throughout. You see working software every 2 weeks.

Step 05

QA and security audit

Deep functional testing, extreme load testing, and a targeted security review prior to the final launch.

Step 06

Launch and handover

Complete go-live support, exhaustive documentation handover, and thorough team training sessions.

Results we've delivered

100%ownership of code handed over to clients
Zerocritical vulnerabilities found in post-launch pen tests
2-weeksprint cycles delivering continuous working software

* Results vary by starting point and engagement scope.

Frequently asked questions

We are honest and not evasive about pricing. A simple internal tool typically runs NZD 20,000–50,000. A mid-complexity SaaS product ranges from NZD 80,000–200,000. A full enterprise platform with mobile integration and strict compliance needs starts at NZD 200,000+. Price is driven by scope. Smahh provides a detailed, fixed-price estimate for the initial build scope after a discovery session.

A simple tool takes 6–10 weeks. A mid-complexity product takes 3–6 months. A large platform can take 6–18 months. Smahh always delivers in phases so the business gets working software early, rather than waiting for a big bang release at the end of a long project.

Smahh builds the robust backends and APIs that serve both web and mobile clients. For native iOS and Android development, we partner with selected mobile specialists. For web-based progressive web apps (PWA), Smahh delivers the solution end to end.

We offer three options: a full handover to your internal team, an ongoing support retainer with Smahh, or a hybrid approach. Smahh recommends investing in 3 months of post-launch support during which we monitor, fix issues, and hand over knowledge progressively. After that, most teams can run the product entirely independently.

Both. Startup engagements typically start with a focused MVP scope to prove the concept. Established business engagements often begin with a legacy modernisation or complex integration project. Smahh has successfully worked with businesses ranging from pre-revenue startups to listed companies across NZ and Australia.

Yes — an embedded model is absolutely available. Smahh engineers can join your existing team's daily standups, use your CI/CD tooling, and contribute code alongside your developers. This is very common when a business needs specialist skills (like security architecture, backend performance, or cloud infrastructure) that complement their internal team.

Ready to build secure software?

Let's discuss your application requirements and architect a secure solution.

Talk to our team