Custom software that follows your process, with a written plan, tests and senior nearshore engineering. For companies that outgrew packaged software.
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Mahout ERP Cloud:
~417Klines of code and ~1,400 REST endpoints
ADT Solar:
Internal SaaS integrated with Salesforce, DocuSign and Airplane
MPC:
Multi-tenant user management for a platform in 20,000+ locations, 30 countries
The Hackett Group:
DIAL, a multi-tenant platform with 74 pages and 27 API routes
Mahout ERP Cloud: ~417K lines of code and ~1,400 REST endpoints
ADT Solar: internal SaaS integrated with Salesforce, DocuSign and Airplane
MPC: multi-tenant user management for a platform in 20,000+ locations, 30 countries
The Hackett Group: DIAL, a multi-tenant platform with 74 pages and 27 API routes
The off-the-shelf ERP or CRM covers part of the operation, and the rest lives in spreadsheets and manual rework.
Every system holds a different version of the customer, the inventory and the order, and nobody trusts the reports.
The previous vendor delivered a system with no tests and no documentation, and every change breaks something else.
The per-user SaaS fee grows with the company, but the features you need never arrive.
Finance, orders, inventory, sales and support modules modeled on your process, with role-based permissions and an audit trail.
Portals for customers, partners or internal teams, with self-service signup, role-based permissions, real-time dashboards and each company's data kept apart (multi-tenant).
REST APIs documented in OpenAPI and integrations with ERPs, payment providers, Brazilian e-invoicing (NF-e) and legacy systems, with queues and reprocessing so a failure does not become a lost order.
Specs, architecture decision records (ADRs) and acceptance criteria written before the code, so the system does not depend on the memory of one person.
Unit, integration and end-to-end (E2E) tests run on every change and block whatever breaks what already works; automated deployment and reproducible Docker environments.
A migration plan with data validation, a planned cutover to the new version and support through the first weeks of operation.
See also: marketplace and payment integrations, legacy modernization, and campaign landing pages.
Multi-tenant ERP SaaS for SMBs, e-commerce retailers and franchise networks, with Brazilian e-invoicing (NF-e) through SEFAZ.
Sunlighten, the internal SaaS behind residential solar operations, with integrations that automate the workflow from sale to installation.
Multi-tenant user management system, built from scratch on Laravel 12 and Vue 3, for a retail-pricing platform.
DIAL: AI-native data-strategy platform for enterprise clients, on Next.js and TypeScript.
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Custom software development is building business systems, such as an ERP (company management), a CRM (customers and sales), a POS (checkout) and web portals, around how the company works instead of bending the process to a packaged product. Hire it when subscription software does not cover the operation or the system is part of your edge.
We map processes, current systems, integrations and risks with the people who run the business. You receive an assessment with the prioritized scope, the target architecture, the plan and the estimate.
Business rules, specs, ADRs and acceptance criteria written before the code. You approve what will be built, in which order and how each delivery will be validated.
The most important flow working end to end, on real data and with tests. You receive an environment to use and decide based on running software, not on slides.
Short iterations with frequent releases: modules, integrations, data migration and training. You receive the system in production, with a deployment pipeline and trained users. Broad systems are split into phases.
Monitoring, fixes and new features, with documentation and mentoring so your team can take the system over. Evolution can continue under a monthly retainer.
| Scope | Typical timeline | Engagement model |
|---|---|---|
| DiscoveryProcesses, integrations, target architecture, plan and estimate | 1–2 weeks | Fixed-scope project |
| MVPThe main flow end to end, on real data, with tests and CI/CD | 2–4 weeks | Fixed-scope project |
| ProductionPriority modules, integrations, data migration and training; broad systems in phases | 6–12 weeks | Fixed scope or time & materials with a cap |
| Ongoing evolutionNew features, maintenance and fractional architecture | Ongoing | Monthly fractional retainer |
Timelines are typical ranges. Discovery defines the scope and the estimate of each project; the contract can be in USD or BRL.
Want to know which format fits your project?
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We use AI coding agents to speed up the build, never to skip steps: specs come before code, tests block regressions and every decision gets senior human review.
Where AI comes inAI coding agents (Claude Code, Codex, Cursor, Copilot, OpenCode) implement modules and tests from approved specs, following Spec-Driven Development.
What humans reviewBusiness rules, architecture, ADRs and every merge go through senior human review.
Quality gatesAutomated tests, coverage targets and CodeQL static analysis block the merge when they fail.
Inherited codeAI helps read and document undocumented systems before any change is made.
AI inside the systemWhen the case calls for an assistant or an LLM automation, it ships with guardrails and automated evaluation.
Your dataNothing your company shares is used to train models, and the work is covered by an NDA.
| Criterion | Custom software | Off-the-shelf SaaS | Low-code |
|---|---|---|---|
| When it makes sense | A process of your own, critical integrations or a system that sets the company apart | A standard market process the product already covers | Simple internal workflows and prototypes, with few users |
| Fit to the process | The system follows the process of the company | The company adapts its process to the product | Good within the platform components; limited outside them |
| Integrations | Any system with an API, a file or an accessible database | Those the vendor offers, plus the public API | Prebuilt connectors; cases outside the catalog need code |
| Cost over time | Higher upfront investment; then hosting and maintenance, with no per-user license | Low entry cost; a subscription that grows with users and modules | Low entry cost; a license per user or per application |
| Dependency | Code and data stay with the company, under the contract terms | Roadmap, pricing and data follow the vendor | The application is tied to the platform; moving usually means a rewrite |
The cost depends on four factors: the number of modules and screens, the integrations with other systems, data migration, and the tax and security requirements. For that reason we publish no price list. A 1–2 week discovery defines the scope and the estimate, and the proposal can be fixed scope or time & materials with a cap, in USD or BRL.
Typical timelines are: discovery in 1–2 weeks, an MVP in 2–4 weeks and a first version in production in 6–12 weeks. Broad systems, such as a full ERP, are delivered in phases, each with its own scope and estimate. The biggest factors are the integrations, data migration and the availability of the people who validate deliveries.
Buy off-the-shelf when the process is a market standard; build custom when the process is your edge, integrations are critical or the per-user fee has become a burden. A common middle ground is to keep the SaaS for what is standard and build only what sets the company apart, integrated through APIs. Discovery compares the paths with the numbers of your case.
Ownership of the code is set in the contract before work starts, together with scope and confidentiality. At handover you receive the source code, the tests, the infrastructure scripts and the documentation (specs and ADRs), so your team or another vendor can run and evolve the system without depending on us.
You choose between two paths: a monthly retainer with us, for fixes, evolution and monitoring, or a handover to your team, with documentation and mentoring. Either way the system ships with automated tests and CI/CD, which lowers the risk of every change. Support terms are set in the contract.
Yes. We start with a 1–2 week discovery that reads the code, runs what exists and separates what can be kept from what must be rebuilt. Before changing anything, we write tests that pin down the current behavior. At Regal Rexnord, we used Claude Code to reverse-engineer undocumented legacy code.
Senior engineering from start to finish: whoever designs the architecture also writes and reviews the code, with 20+ years of accumulated software engineering experience. No work is passed on to a junior team. AI coding agents under human review extend delivery capacity: at The Hackett Group, this model delivered about 50 tasks per week.
Master Timm builds custom software from São Paulo, Brazil, for companies in the United States and Brazil, fully remote. We built Mahout ERP Cloud, an ERP SaaS with about 417K lines of code, and have served US enterprise clients since 2022. For US companies, São Paulo is 1–2 hours ahead of US Eastern Time, and communication is in English.
AI-focused IT consultancy
Senior engineering from discovery to delivery: whoever designs the architecture also writes and reviews the code.
Master Timm · Updated on
In the first conversation we look at the process, the current systems and the integrations, and tell you plainly whether the case calls for custom software, off-the-shelf SaaS or a mix of both.
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