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Advisory · Engineering · Custom development

Modernizing critical systems without disrupting the business

We help companies and technology teams make architecture decisions, modernize legacy systems, integrate platforms and build custom software. We start by understanding the problem and its risks, then propose a phased path your operation can sustain.

Version UnoVersion Uno

01

Technical judgment in service of the business

Our team brings experience across software analysis and delivery, architecture, platform integration, technical leadership and project management. That is why we assess every decision by its impact on operations, people and the business.

We work with executives, technology leaders and engineering teams when an important decision calls for context, options and a realistic path forward: modernizing a legacy system, tackling technical debt, integrating platforms or building something new.

We do not start with a fashionable technology or a predetermined solution. We first understand the problem, the constraints and the cost of inaction; then we lay out alternatives and priorities the team can sustain.

  • Architecture decisions

    Options, trade-offs and risks explained in context—not driven by trends.

  • Modernization without downtime

    Phased change, with tests in place before touching code and the old and new systems running side by side.

  • Enterprise integration

    Clear contracts, flows and responsibilities across systems, vendors and business teams.

  • Security by design

    Every integration and service is designed the way an attacker would probe it, closing gaps before production.

02

Three ways to work with us

From a focused assessment to building an entire platform. Scope is agreed around the challenge, and every service ends with a concrete outcome.

# 01 · advisory

Technology advisory

Focused engagements or ongoing support to reduce uncertainty, prioritize investment and give technical teams direction.

  • Architecture Review

    For leaders who need to validate an existing architecture or platform decision before committing time and budget.

    Outcome: A risk and trade-off assessment, viable alternatives and prioritized recommendations.

  • Technical Debt Audit

    For teams facing friction, incidents or slower delivery that need to distinguish symptoms from root causes.

    Outcome: An impact-based technical debt map, associated risks and a practical improvement sequence.

  • Legacy Modernization Assessment

    For organizations evolving legacy systems without putting business continuity at risk.

    Outcome: Modernization options, dependencies, migration stages, coexistence and rollback criteria.

  • Fractional CTO Advisory

    For growing companies that need senior technology judgment without immediately hiring a full-time CTO.

    Outcome: Ongoing guidance on the technology roadmap, architecture decisions, risk and business alignment.

  • Integration Strategy Review

    For environments with fragile integrations, inconsistent contracts or changes that trigger cascading effects.

    Outcome: A review of flows and contracts, dependency risks and an evolutionary integration strategy.

  • AI Adoption Assessment

    For leaders considering AI who need to separate concrete opportunities from risks and expectations.

    Outcome: An assessment of use cases, data, privacy and security, plus a responsible pilot proposal.

  • Software Delivery Optimization

    For organizations seeking to understand unpredictable delivery or why changes arrive with too much risk.

    Outcome: An analysis of delivery bottlenecks and practices, with prioritized actions to improve flow.

  • Engineering Team Mentoring

    For teams and leaders looking to strengthen design judgment, decision-making and technical collaboration.

    Outcome: Mentoring and technical review sessions focused on the team’s real challenges.

# 02 · engineering

Engineering and modernization

Hands-on work in the code: we clean it up, review it and evolve it without breaking what works today.

  • Refactoring and modernization

    For systems where every change takes longer and costs more, and nobody dares touch certain parts. We first pin down current behavior with tests, then apply small, verifiable changes.

    Outcome: Code refactored in stages, automated tests in your repository and a record of architecture decisions.

  • Code and security review

    To know the state of your software before investing more, switching vendors or going live: quality, vulnerabilities, access control, performance and tests.

    Outcome: A report with findings ranked by risk and a proposed fix for each one.

  • Web and API development

    For platforms, portals and integrations that must work well from day one and stay easy to maintain as they grow.

    Outcome: A production application with its source code, API documentation and a build and deployment pipeline.

# 03 · development

Custom development

We build the complete solution when nothing off the shelf fits your operation, from design through go-live.

  • Mobile and desktop applications

    For processes that happen in the field, at the counter or without reliable connectivity and need a dedicated app.

    Outcome: A published, working application with its source code, user guide and go-live support.

  • Cloud solutions

    To move systems to the cloud or to your own servers with repeatable deployments, backups and monitoring.

    Outcome: Documented infrastructure, automated deployment and operating and recovery procedures.

  • ERP and business system integrations

    For companies whose information is spread across their ERP, spreadsheets and other platforms.

    Outcome: Integrations with clear contracts, error handling and traceability for every exchange.

  • Applied artificial intelligence

    To bring AI where it adds measurable value: assistants, classification, computer vision or automation of repetitive tasks.

    Outcome: A proof of concept evaluated on real data, acceptance criteria and a plan to take it to production with human review.

  • Cybersecurity

    To review the exposure of your applications and infrastructure before someone else does.

    Outcome: A risk assessment, prioritized findings and practical hardening measures.

# diagnostico --gratis

Start with a free assessment

We review a representative part of your system or challenge at no cost and give you concrete findings, so you can decide with real information whether to continue, and with what scope.

Request a free assessment
  • A conversation to understand the context, goals and constraints.
  • A focused review of code, architecture or integrations: up to 6 hours of analysis.
  • A report with findings ranked by risk and recommended next steps.
  • No strings attached: the report is yours, whether or not you continue.

03

Three complex challenges, approached through design

Anonymized examples of analysis and solution design currently in progress. They show how we translate operational complexity into requirements, clear boundaries, integrable architecture and a validation plan, including responsible AI adoption.

To protect confidentiality, names, locations, figures, committed metrics, equipment specifications, operating parameters and contractual details are omitted. These are designs in progress; stated objectives are not presented as achieved results.

04

Products and platforms

Software we design, build and run ourselves, and platforms we develop for clients. The best evidence of how we work.

  • Parking management · Desktop

    Live

    vParking-X

    A desktop platform for managing parking operations, from vehicle entry through cash handling, shifts, agreements and reporting.

    View technical scope
    • Clean Architecture with BLoC and dependency injection, organized into modules: parking, cash register, shifts, agreements, reports and users.
    • Licenses signed with Ed25519 and verified offline, bound to the machine’s hardware and stored with AES-256 encryption.
    • Hybrid architecture: a local Drift database plus multi-tenant MySQL / MariaDB, with access auditing, session tracking and automatic user lockout.
    • Windows builds on GitHub Actions and error monitoring with Sentry. Runs on Windows 10/11 and macOS (Intel and Apple Silicon).
    • Flutter
    • Dart
    • BLoC
    • Drift
    • MySQL / MariaDB
    • Ed25519
    • Sentry
    • GitHub Actions
  • Multi-school class treasury

    Live

    vTesorería

    Financial management for school communities, with separate funds and ledgers for parents and students.

    View technical scope
    • Eight NestJS 11 microservices with a gateway and per-IP rate limits.
    • The database guarantees the ledger always balances: 60 tables and a single stored procedure that every entry goes through.
    • Passing test suites: 347 end-to-end, 42 Playwright UI tests and 77 database invariants.
    • Mobile-first React 19 PWA with QR-code web sign-in, and receipts stored in Cloudflare R2 behind signed URLs.
    • NestJS 11
    • MariaDB 10.11
    • Valkey
    • Cloudflare R2
    • React 19
    • PWA
  • Scheduling & booking SaaS

    In development

    vCalendario

    An open scheduling and booking platform for professionals and organizations, with white-label branding, built-in payments and booking assistance.

    View technical scope
    • Turborepo monorepo with Next.js 16 and React 19.
    • Prisma 7 on PostgreSQL, with per-organization API keys.
    • Online payments built into the booking flow.
    • Assisted scheduling powered by the Claude API.
    • Next.js 16
    • React 19
    • TypeScript
    • Prisma 7
    • PostgreSQL
    • Turborepo
  • Multi-company e-invoicing

    In development

    Middleware SII

    A service that issues electronic receipts, invoices and credit or debit notes to Chile’s tax authority (SII) on behalf of any company. Other systems consume it over HTTP without needing to know anything about the SII.

    View technical scope
    • Manages authorized folio ranges (CAF), electronic stamps and XMLDSig signatures, and validates every document against the official XSD before using a folio.
    • Automatic submission and status tracking for every document sent to the SII.
    • Certificates and private keys stored with AES-256-GCM encryption.
    • An isolated project with its own database, deployment and continuous integration.
    • NestJS 11
    • TypeScript
    • MariaDB
    • XMLDSig
  • Client project

    Live

    El Arte de Sostenerme

    Emotional well-being platform

    A therapeutic support platform that brings content, resources and subscriptions together for therapist Caro Rojas’s clients.

    View technical scope
    • Nine NestJS microservices behind an API gateway.
    • React web app for members and an Angular admin panel.
    • Three private servers with Nginx and Cloudflare; the origin only accepts Cloudflare traffic.
    • Security audits covering IDOR, rate limiting and firewall hardening.
    • NestJS
    • React
    • Angular
    • MariaDB
    • Redis
    • Nginx
    • Podman
    • Cloudflare

05

Experience in demanding industries

Our team has taken part in technology projects in sectors where operational continuity, security and system integration are not optional.

06

A clear process, no surprises

The scope follows the problem; every stage ends with concrete next steps.

  1. 01

    Free assessment

    We understand the context, review a representative sample and hand you prioritized findings.

  2. 02

    Proposal with agreed scope

    We turn the findings into a phased plan, ranked by impact, effort and risk.

  3. 03

    Phased delivery

    Short, verifiable deliveries, with tests in place before touching what already works.

  4. 04

    Support and handover

    We document decisions and support your team until it can sustain the change.

root@versionuno:~# contacto

Before a major decision, let’s talk

Tell us which system, modernization or architecture challenge is holding your team back today. We start with a free assessment to understand the context and see how we can help.