StackApps
Software your clients can trust. Software your team will actually use.
We build secure, AI-native tools for professional services businesses that handle sensitive data. Before we write a line of code, you'll have a complete Technical Blueprint — exactly what we'll build, what it costs, and whether custom software is even the right answer.
Not a dev agency. Something more useful.
Every developer says they care about quality. Three things make StackApps structurally different.
Security built in from day one.
Not reviewed at the end — architected in from the first line. Every StackApps project is security-reviewed by the same team that runs StackGuard audits. Data exposure, access controls, API hardening: covered by design, not afterthought.
A Blueprint before a single line of code.
Every engagement starts with a 15–20 page Technical Blueprint — a complete specification that tells you what we'll build, how much it costs, and whether custom software is even the right answer. You can take that Blueprint to any developer in the world.
Your code. Your servers. Your future.
You own 100% of everything we build. Full source code, documentation, and deployment. No vendor lock-in, no ongoing licence fees, no dependency on us to keep the lights on — unless you want the retainer.
Who this is for.
StackApps is built for businesses where what you build, and how securely you build it, actually matters.
- CA firms and chartered accountants — handling sensitive financial data for clients
- Law firms and legal practices — managing privileged client communications and case files
- Financial advisors and wealth managers — needing secure, compliant client-facing tools
- Professional services businesses — that have outgrown generic SaaS tools
- Businesses with StackFlow automation — that need a user interface for their AI agents
What we build.
Four categories. Each anchored to a real problem — not what looks good in a portfolio.
Secure Client Portals
Still sharing sensitive documents over email and WhatsApp?
A branded portal where clients access their documents, invoices, reports, and project updates — with proper access controls, audit trails, and encryption at rest. For CA firms, law firms, and financial advisors: this replaces the most trust-eroding habit in professional services.
AI-Powered Internal Tools
Running critical operations on a spreadsheet with 40 tabs?
Purpose-built tools that replace your most painful manual process — approval queues, compliance trackers, proposal generators, onboarding workflows. AI is built in from the start, not added later. These are the tools your team will actually open every morning.
Operations Dashboards
Running AI agents but no visibility into what they're doing?
A unified control panel that shows agent status, task queues, approval workflows, and performance metrics. Keep humans in the loop without slowing things down. Built for businesses that have automated with StackFlow and need a proper interface for their AI workforce.
System Integrations
Your team copies data between tools for hours every week?
Custom middleware that connects your CRM, accounting software, ERP, and communication tools into a single data flow. No more double-entry. No more mismatched records. Built and security-reviewed so your data pipeline is as robust as your front-end.
The Technical Blueprint.
A 15–20 page specification that tells you exactly what to build — before you commit to building it. Valuable on its own even if you never proceed.
Includes an honest "Build vs. Buy" analysis for every major component. We will tell you if a SaaS tool solves your problem better than custom software.
What's in the Blueprint
- System architecture with technology choices justified
- Database schema and data flow map
- User story map — who uses what, when, why
- API integration inventory
- Security architecture (aligned with StackGuard findings if applicable)
- Build effort estimate with phased delivery option
- "Build vs. Buy" analysis for each major component
- 15–20 page branded PDF — yours to keep regardless of next steps
Three modules. One consistent process.
Start with the Blueprint. Add a Build when you're ready. Evolve with a Retainer. Every step follows the same security-first standard.
Technical Blueprint
Diagnosis before build
- System architecture with technology choices justified
- Database schema and data flow map
- User story map — who uses what, when, why
- API integration inventory
- Security architecture (aligned with StackGuard findings if applicable)
- Build effort estimate with phased delivery option
- "Build vs. Buy" analysis for each major component
- 15–20 page branded PDF — yours to keep regardless of next steps
Custom Build
From specification to shipped product
- Security-reviewed, AI-native development
- Full-stack implementation from the Blueprint spec
- Automated testing and staging deployments
- Code review and documentation at every milestone
- Human-in-the-loop controls where needed
- Deployment to your infrastructure — your servers, your control
Managed Evolution
Ongoing product development as a retainer
- Monthly sprint cycles — new features shipped on a rhythm
- Quarterly security re-review via StackGuard
- Performance monitoring and optimisation
- New integrations as your stack evolves
- Priority support and incident response
- Documentation kept current with every change
Security is not a feature. It's the architecture.
Every StackApps project is built and reviewed by the same team that runs StackGuard security audits. Architecture reviewed for data exposure. API endpoints hardened. Access controls verified. Deployment security checked. For businesses handling sensitive client data — financial records, legal documents, personal information — this is not optional. It's what makes StackApps different from every other agency.
Choose your engagement.
Start with a Blueprint. Scale to a full build. Every tier includes a security review.
Technical Blueprint
Diagnosis before commitment
Ideal for: I know what I need. I want a specification before I commit to a build.
- Architecture spec + data model
- User stories + API inventory
- Security architecture review
- Build-vs-Buy analysis
- 15–20 page branded PDF
- 5 business days
- Yours to keep — take it to any developer
Rapid Build
Your first custom tool
Ideal for: Replacing a spreadsheet or a single painful manual process.
- Blueprint included
- Single-purpose tool, 1 core workflow
- Responsive design
- Security review
- 30-day build
- 30-day post-launch support
Full Build
Multi-workflow application
Ideal for: Client portal, operations dashboard, or internal platform.
- Blueprint included
- Multi-workflow application
- AI agent integration
- Admin dashboard
- 60-day build
- 60-day post-launch support
Platform Build
Complex multi-user platform
Ideal for: Enterprise internal platform or client-facing product.
- Blueprint included
- Multiple integrations
- Custom AI features
- Phased delivery
- 90-day post-launch support
- Training + documentation
Build Retainer
Continuous product evolution
Ideal for: Ongoing feature development and maintenance.
- Monthly sprint cycles
- New feature builds
- Quarterly StackGuard re-review
- Priority support
- Performance monitoring
- Documentation updates
How we build it.
Blueprint
We produce a complete specification. You approve before we write a line of code.
Design
We architect the solution at the system level. You see exactly what we'll build.
Build
We develop, test, security-review, and document every component.
Ship
We deploy to your infrastructure, train your team, and hand you the keys.
Coming from StackFlow?
A StackFlow 20x Audit often surfaces automation opportunities that need a proper user interface — not just an agent running in the background. StackApps builds those interfaces. The architecture already matches your data flows. The security posture is already defined. You don't start from scratch.
Haven't audited your security yet? Start with StackGuard.
Building software on top of a vulnerable infrastructure creates compounding risk. A StackGuard audit maps your exposure first — so what we build together is secure from the ground up, not secured as an afterthought.
Know what you need. Not sure how to build it?
A Technical Blueprint scopes your project in 5 business days. You'll have a complete specification, a clear cost estimate, and an honest verdict on whether custom software is even the right call.