Whole software,no fractions.
integer3 designs, builds and runs custom software, AI agents and cloud platforms for teams that need the whole thing to work.
We design 
the product, build 
the platform, wire in 
the agents and run 
it, as one team.
What we build
Custom Software & SaaS
Multi-tenant SaaS platforms and internal systems, designed with your users and built to be run for years.
Product discovery, UI/UX design, Multi-tenant architecture, Billing and subscriptions, QA and test automation
Read about Custom Software & SaaS
From brief to live
- Discover. First, we map users, data and risks.Discover. First, we pick one workflow and its data.Discover. First, audiences, platforms and scope.Discover. First, an audit of what runs where.
- Design. Then flows and UI, tested with users.Design. Then tools, guardrails and evaluations.Design. Then prototypes on real phones.Design. Then the target architecture and costs.
- Build. Next, two-week releases to staging.Build. Next, a pilot with real users.Build. Next, weekly test builds.Build. Next, move service by service.
- Scale. Finally, launch, measure and grow.Scale. Finally, more workflows, measured.Scale. Finally, store launch and updates.Scale. Finally, on-call, tuning and savings.
Typical durations from discovery call to launch. Your project gets its own plan.
Agents that ask first.
Support triage agentRun 4821
Ticket
“Hi, my order A-1187 arrived damaged. Can I get a refund?”
search_orders(id: "A-1187")Delivered 12 days ago · €84.00 · cardcheck_policy("damaged_on_arrival")Eligible: full refund within 30 daysissue_refund(amount: 84.00)Needs approval: refunds over €50ApproveEditReject
3 tool calls, 2.4 s, €0.004Replay
Every tool call is logged, every risky step waits for a person, and every run can be replayed.
Tools we stand behind
| Area | Tool | What for |
|---|---|---|
| Front end | TypeScript | One typed language from database to browser |
| Next.js | Web apps and sites, rendered at the edge | |
| Mobile | React Native | iOS and Android from one codebase |
| Back end | Node.js | APIs, workers and integrations |
| GraphQL | Typed APIs between every client and server | |
| AI | Python | Data pipelines and model tooling |
| Anthropic Claude | Reasoning and tool use inside agents | |
| pgvector | Search over your own documents | |
| Data | PostgreSQL | The system of record |
| Redis | Queues, caching and rate limits | |
| Cloud | AWS | Compute, storage and networking |
| Vercel | Serverless hosting for web front ends | |
| Terraform | Infrastructure defined as reviewed code | |
| Docker | Identical builds from laptop to production | |
| Quality | GitHub Actions | Tests and deploys on every change |
| Playwright | End-to-end and accessibility tests | |
| Sentry | Errors and performance in production |
Start a project
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