# Jhonatan Arenas

Jhonatan Arenas is a remote worker on Himalayas, Backend Engineer at HostReach, based in Colombia.

Source: https://himalayas.app/@jhonatanarenas

```text
AI Software Engineer at Kolomolo who built a grounding guardrail and MCP tool for Bedrock AgentCore.
```

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | Colombia |
| Authorized to work in | Colombia |
| Salary expectations | 55k+ USD |
| Job categories | AI Engineer, Backend Engineer, Full Stack Developer |
| Skills | AI Agents, Crew AI, AgentCore, Strands Agents, AWS, Model Context Protocol (MCP), LLM Tools, RAG, Bedrock Knowledge Bases, Grounding Guardrails, Lang Chain, Vector Search, Pgvector, Python, TypeScript |
| LinkedIn | https://linkedin.com/in/jhonatan-arenas-developer |
| GitHub | https://github.com/cybernuki |

## About

```text
At Kolomolo, I contributed to Apnea Clinic’s multi-agent platform on Amazon Bedrock AgentCore, building a Chat Agent and an Insights Generation Agent. I also built a grounding guardrail that checks responses against retrieved knowledge sources and blocks ungrounded answers from being saved to memory.

For Unity Ops, I contributed CrewAI workflows that turn OpsGenie alerts into contextualized Jira tickets. I designed SQS-metric-driven autoscaling for ECS Fargate tasks and built Slack alerting for pipeline errors.

At Kolomolo, I designed conversational flows for OpsGenie response agents and implemented a serverless observability API using AWS Lambda and DynamoDB. I also built the supporting AWS CDK infrastructure and GitLab CI/CD pipelines.

At HostReach, I built and maintained a multi-source ingestion pipeline for Spanish real-estate portals, connecting Apify scraping actors to ClickHouse. Earlier, at Globant and Tul, I developed backend features, APIs, and microservices.
```

## Experience

### Backend Engineer (current)

HostReach. Jan 2025 - Present

```text
Built and maintained a multi-source data ingestion pipeline for real-estate portals. Refactored REST API contracts and diagnosed production incidents.
```

Skills: NestJS, TypeScript, Apify, Clickhouse, AWS, Jest, Supertest

### Full-Stack / Gen AI Developer (current)

Kolomolo. Jul 2024 - Present

```text
Designed conversational flows for AI agents monitoring OpsGenie alerts. Implemented serverless REST APIs, cookie-based authentication with JWT and Cognito, and AWS CDK infrastructure.
```

Skills: AWS-Lambda, DynamoDB, AWS-CDK, GitLab-CI-CD, JWT, Cognito, SNS, REST-APIs

### Backend Engineering on the clinical platform

Kolomolo. Jun 2026 - Jul 2026

```text
Backend engineering on a clinical platform's data pipeline, preserving manual CPAP raw data across ingestion failures and adding cleanup for failed ingestions.
```

Skills: TypeScript, Data-Pipelines, OSCAR

### Gen AI Engineer - Apnea Agent Core

Kolomolo. Feb 2026 - Jul 2026

```text
Contributed to a multi-agent clinical platform on AWS Bedrock AgentCore, building conversational and insights generation agents. Implemented grounding guardrails, MCP tools, and modular AWS CDK infrastructure.
```

Skills: Python, AgentCore, AWS-CDK, Bedrock-Knowledge-Bases, MCP, Pytest, GitLab-CI-CD, Test-Driven-Development

### Gen AI Engineer - Unity Ops (ITSM)

Kolomolo. Sep 2025 - Dec 2025

```text
Contributed to an AI-powered IT Service Management platform using CrewAI and AWS Bedrock, automating incident handling. Implemented custom field extraction, self-recovery flows, and SQS-metric-driven autoscaling.
```

Skills: Crew-AI, AWS, AWS-ECS-Fargate, Aurora-PostgreSQL, Pgvector, Lang-Chain, Amazon-SQS, Lambda, AWS-CDK, GitLab-CI-CD

### Node.js Developer

Globant. Jan 2022 - Mar 2024

```text
Developed features and resolved defects across microservices with REST APIs for a US education platform. Extended Cognito role assignments and migrated AWS SDK v2 to v3.
```

Skills: NestJS, TypeScript, PostgreSQL, AWS, Lerna, New-Relic

### Backend Developer

Tul. Sep 2020 - Aug 2021

```text
Implemented fallbacks and migrations to move business logic from a Laravel monolith into microservices. Built new microservices in Kotlin/Spring and integrated AWS S3 and Algolia.
```

Skills: Laravel, Kotlin, Spring-Framework, S3, Algolia

## Education

### AWS Educate

Introduction to Generative AI, Generative AI

```text
Completed the Introduction to Generative AI course offered by AWS Educate.
```

## Tech stack

- Amazon API Gateway
- Amazon S3
- PostgreSQL
- Node.js
- Laravel
- Spring
- NestJS
- Jest
- SuperTest
- Lerna
- JavaScript
- Python
- Kotlin
- Amazon SQS
- Amazon SNS
- Amazon DynamoDB
- New Relic
- Algolia
- AWS Lambda
- Amazon Aurora
- TypeScript
- pytest
- Amazon Cognito
- Docker
- Apify
- SQL
- Clickhouse
- LangChain
- CrewAI
- Vitest
- k6
- pgvector
- Model Context Protocol (MCP)
- Retrieval-Augmented Generation (RAG)
- AWS

To contact Jhonatan, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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