RUMAZA Studio
AI for business

Custom AI Solutions Development: From Idea to Production Software

We don't sell licenses or fluff. We build agents, RAG, document pipelines, and integrations — with code, tests, logs, and handover.

The Problem

Companies want 'custom' AI but receive unrealistic proposals: a demo in two weeks without integration, or a 12-month project without an interim deliverable. When the invoice arrives, there's nothing in production.

Many providers wrap OpenAI APIs with a nice interface and call it an 'enterprise solution'. Without access to your systems, permissions, evaluation, or monitoring, it’s not development: it’s reselling.

Internal talent is scarce. Hiring a senior ML engineer for a one-off project doesn’t add up. A freelance developer without architecture leaves a script that no one maintains when they leave.

Classic software teams don’t always understand AI patterns: chunking, RAG evaluation, tool calling, token costs, guardrails. The result is fragile integrations that fail at the first peak of usage.

Without a clear definition of 'done' —minimum accuracy, uptime, response SLAs, code ownership— projects drag on and the business loses confidence in AI as a tool.

Custom development doesn’t mean reinventing the model. It means assembling proven components —embeddings, agent frameworks, OCR— with your business logic and integrations.

Post-launch maintenance is real: models change, APIs deprecate, volume grows. Budget 15–25% annually of the initial cost for evolution, not just hosting.

Organizational change matters: support, IT, and business must agree on what gets automated and what requires human judgment. Without that agreement, the project generates internal friction even if the technology works.

Vendor lock-in in AI SaaS: you upload documents and cannot export the index or prompts. In-house development keeps assets active on your balance sheet.

Internal teams are overwhelmed: external development with delivery in a repo and pair programming transfers capability, not eternal dependency.

Code delivered without regression tests on prompts: a minor change breaks extraction in production on Monday. CI for AI is not a luxury.

RUMAZA does not sell licenses: we build systems that you can measure, maintain, and scale. If the core of the problem isn't automatable with available data, we tell you in the first meeting —saving months and budget.

Due diligence on providers: if your investor or large client requests a technical audit, we deliver documented architecture and security practices.

Horizontal scaling: designed so that doubling volume does not double linear cost if there is caching and intelligent batching.

Comparing three quotes without a common specification is pointless: scope, integrations, and acceptance metrics must be identical to decide with criteria.

Code ownership without documentation is an illiquid asset. We deliver a repo, README, diagrams, and a recorded handover session.

Iteration with real data from the first two weeks in production: adjusting thresholds, prompts, and rules with client metrics, not lab assumptions.

Project success is defined in the kickoff meeting: base volume, current time per case, manual error rate, and hourly cost —with that we calculate ROI before writing a line of code.

Training at handover: we do not deliver software that only IT understands. The business user knows how to use, scale, and report incidents with captures and real examples from their day-to-day.

Go-live checklist: permissions, backups, rollback, escalation contacts, and hypercare window agreed in writing —this way production starts without surprises on the weekend.

If after the diagnosis the ROI doesn’t close, we tell you and do not bill for development —better to lose a sale than an unsatisfied client six months later.

The adoption curve improves when the first use case solves a universal pain point for the team —not an innovation experiment that no one asked for.

What is Custom AI Solutions Development (No Fluff)

It’s software engineering applied to problems where an AI component —LLM, vision, embeddings, classification— is part of a larger system: backend, APIs, database, interface, authentication, deployment, and observability.

It includes process discovery, architecture design, implementation, integration with ERP/CRM/channels, evaluation with real data, deployment in your cloud or ours, and documentation for your team or us to maintain.

Typical deliverables: agent with tools, RAG pipeline, document extractor, internal copilot, workflow automation, proprietary API for other systems to consume AI.

The healthy methodology is iterative: scoped MVP in weeks, metrics in production, second phase based on data —not a big bang of six months without validation.

The intellectual property of the custom code is yours. Third-party APIs (OpenAI, etc.) have their licenses. We make this clear in the contract.

Typical RUMAZA stack: Python or TypeScript backend, PostgreSQL, queues, Docker, CI with regression tests on critical prompts. No notebooks in production.

Example acceptance criteria: '≥80% accuracy in extracting amounts from test invoices', 'p95 latency < 8s', '100% logged queries'.

The handover includes a runbook: what to monitor, how to rotate API keys, how to reindex documents, and who to call if the service goes down on a Sunday.

Gradual deployment: pilot with one channel or one type of query, measurement for two weeks, expansion based on data —not a big bang that overwhelms the team and the client.

Contract by phases with signed acceptance criteria: staging, UAT with real users, go-live, and two weeks of hypercare.

Observability: dashboards for latency, error rate, cost per query, and quality drift in extraction or RAG.

Documentation for internal IT: diagrams, environment variables, runbook, and escalation contact. Complete delivery, not just a zip with code.

RUMAZA criterion: specific problem, accessible data, success metric, and closed scope. Without those four pillars, there is no project —there’s an experiment that bills well for the consultant and poorly for the client.

Infrastructure as Code: Terraform or similar to reproduce staging and production environments without 'it works on my machine'.

Optional quarterly roadmap: new RAG sources, languages, or connectors based on measured business priority.

Evolutionary maintenance —new intents, providers, languages— is budgeted separately from the MVP to avoid surprises or zombie projects.

Pen tests and attack surface review on exposed APIs before going live —not just functionality.

Post-launch support with direct channel and agreed SLA: critical incidents during business hours resolved the same day —not an eternal ticket.

We document assumptions, known limits, and expansion plans in the delivery —total transparency about what the system does today and what remains for a phase two if the numbers justify it.

Architecture prepared for expansion: new channels, languages, or documents without having to rebuild from scratch —modular extension, not a fragile monolith.

Alignment with security and legal from design: DPIA when applicable, record of processing activities, and clauses with cloud model subprocessors.

Retrospective meeting at 30 and 60 days: what worked, what to adjust, whether a phase two is advisable —decision based on data, not budget inertia.

We prioritize deliverables that the business notices in the first week: a resolved query, a processed document, or a useful draft —early wins that finance confidence in the rest of the roadmap.

Admin panel for IT: users, indexed sources, consumption, and alerts without relying on tickets to external development for every minor change.

When It Makes Sense

Criterios
  • Market SaaS does not fit your process or systems —with volume and data justifying it.
  • You need deep integration with ERP, CRM, or legacy systems —with volume and data justifying it.
  • Privacy requirements prevent data on generic platforms —with volume and data justifying it.
  • You want code ownership and to avoid vendor lock-in —with volume and data justifying it.
  • Volume justifies optimizing costs versus user-based solutions —with volume and data justifying it.
  • You are looking for a technical partner, not just licenses —with volume and data justifying it.

What Can Be Built

01

Agents with Tools

Software that queries APIs, creates tickets, drafts, and executes with permissions and logs. Includes logs, confidence thresholds, and human review in the initial phase until metrics are calibrated in production.

02

Corporate RAG Platform

Ingestion, search, chat with citations, and admin panel for sources. Includes logs, confidence thresholds, and human review in the initial phase until metrics are calibrated in production.

03

Document Pipelines

OCR + extraction + validation + ERP. High volume, low manual intervention. Includes logs, confidence thresholds, and human review in the initial phase until metrics are calibrated in production.

04

Proprietary AI API

Internal endpoint for your product or departments to consume classification, summarization, or extraction. Includes logs, confidence thresholds, and human review in the initial phase until metrics are calibrated in production.

How RUMAZA Would Build It

01
Technical Discovery
Process, systems, APIs, legal constraints, and volume. Documented deliverable reviewed with you before the next step.
02
Architecture and Scope
Diagram, stack, deliverables, acceptance criteria, and fixed price per phase. Documented deliverable reviewed with you before the next step.
03
MVP Sprint
Code in repo, basic CI, staging environment, and evaluation with real data. Documented deliverable reviewed with you before the next step.
04
Integrations
Robust connectors with retries, queues, and error handling. Documented deliverable reviewed with you before the next step.
05
Production
Deploy, monitoring, cost and quality alerts. Documented deliverable reviewed with you before the next step.
06
Handover
Documentation, training, and option for monthly maintenance. Documented deliverable reviewed with you before the next step.

Possible Technologies

  • Python
  • TypeScript / Next.js
  • Django / FastAPI
  • PostgreSQL + pgvector
  • OpenAI / Anthropic / local models
  • Docker / AWS / GCP
  • Celery / Temporal
  • GitHub Actions

Hypothetical Application Scenarios

Escenario 1

Product Idea with AI but No Clear Architecture

They want to 'add AI' but have not defined data, flow, or metrics. Fits diagnosis, scoped MVP, and code they can maintain or scale.

Escenario 2

No-Code Prototype That Falls Short

Zapier or visual tools can no longer handle volume, permissions, or logic. Custom development when the use case is validated.

Escenario 3

AI Integration in Existing Software

Portal, ERP, or internal app where a classification, extraction, or assistant module must coexist with current users and roles.

Common Mistakes

Evitar
  • Hiring without measurable acceptance criteria
  • Not requiring repo and documentation from day one
  • Relying on a single founder-freelancer without continuity
  • Skipping evaluation with real data before production
  • Ignoring operational costs (tokens, hosting, support)
  • Mixing endless strategic consulting with zero code
  • Not reviewing the project at 90 days with real metrics and adjusting or closing what doesn’t add value.

Frequently asked questions

Is the code ours?

Yes, in custom development. Repo, licenses, and dependencies documented in delivery. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

Do you work with our IT team?

Yes. Pairing, architecture reviews, and joint security criteria. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

Cloud or on-premise?

Both, depending on policy. Many MVPs start in managed cloud and migrate if necessary. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

What do you need from us?

Access to APIs or test data, business reference 2–4 hours/week, and feedback in reviews. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

Do you offer maintenance?

Yes, optional monthly: updates, monitoring, model adjustments, and support. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

How is billing done?

By phases with closed scope. Typical MVP billed 40% at start, 40% at staging delivery, 20% at production. We define this in scope based on your systems, volume, and legal constraints —without promising generic figures.

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Updated: 2026-06-29 · Author: Rubén Maestre

Do you need AI software, not another presentation?

Describe the problem and the systems involved. I will return architecture, timeline, and a fixed budget by phase.