Witsaba

I build agents and production systems for businesses that need software that actually works.

13+ years shipping production code. Custom agentic solutions, on-prem or SaaS, with a human in the loop.

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Proof points

13+

years shipping production code

540ms

agent latency — was 2.4s

Go · TypeScript · OpenTelemetry

core stack

What we do

Custom agentic solutions

Bespoke LLM agents for sales, support, and internal operations. Coloured Petri Net runtimes, flat director layers, ephemeral agent teams. You own the code, the prompts, and the data.

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Production AI engineering

Go or TypeScript backends, PostgreSQL, OpenTelemetry. HITL approval flows where the cost of a wrong answer is high. On-prem for regulated industries, SaaS for everyone else.

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AI integration audit

A one-week, fixed-scope engagement. I review your existing AI initiative and write up what is working, what is not, and what to do next. No commitment to build.

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Where I have shipped

  1. 2014–2017

    Banco Agrario

    Software Engineer

    COBOL-to-REST migration for core banking. Led teams of 3–10 engineers.

  2. 2021–2022

    Mercado Libre

    Senior Software Engineer

    Payments infrastructure at LATAM scale. TypeScript, PostgreSQL, Kafka.

  3. 2022–2023

    Sonatype

    Senior Engineer

    Supply chain security tooling for the Nexus platform. Go, gRPC, OpenTelemetry.

  4. 2023–2026

    Leal

    AI Engineer

    Agent architecture for LATAM loyalty. Go, Google ADK, on-prem and SaaS deployments.

  5. 2024–2025

    Yuno

    Senior AI Engineer

    Built the MVP Caller: Twilio + OpenAI + ElevenLabs + WebSockets. Four months, ship to production.

  6. 2026–

    Witsaba

    Founder

    Agentic systems and production engineering for LATAM SMBs.

Brayan Arias, founder of Witsaba

Hi, I am Braejan

Senior AI Engineer · Casanare, Colombia · 13+ years shipping

I build agents and agentic solutions for businesses that need production-grade software. Thirteen years of shipping across banks, marketplaces, supply chain, and AI.

I have spent the last three years focused on agent architectures: the runtimes, the orchestrators, the production plumbing that turns a prompt into a service. The work I do for clients is the work I would want to hire for myself.

Witsaba is the company. I am the human. Every engagement is fixed-price, every milestone ships to your repo, and every Friday I send a demo.

How we work

  1. 1

    Discovery call

    30 min · free

    A short call to understand the problem, the team, and the constraints. No slide deck. If we are not a fit I will say so and point you elsewhere.

  2. 2

    Proposal

    1 week · fixed price

    A written proposal: scope, deliverables, milestones, price, and timeline. You sign only if the scope matches what you need. The proposal is the contract.

  3. 3

    Build

    6–12 weeks · fixed price per milestone

    Weekly demos. Code in your repo from week one. Each milestone ships to a staging environment and is paid on acceptance. No retainers, no T&M, no surprises.

Tell me about the problem

The form is the fastest path. Four fields, no marketing list, no drip campaign — your message lands in my inbox within minutes.