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Jhonatan ArenasJA
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Jhonatan Arenas

@jhonatanarenas

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

Colombia
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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

Work history, roles, and key accomplishments

HO
Current

Backend Engineer

HostReach

Jan 2025 - Present (1 year 8 months)

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

KO
Current

Full-Stack / Gen AI Developer

Kolomolo

Jul 2024 - Present (2 years 2 months)

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

KO

Backend Engineering on the clinical platform

Kolomolo

Jun 2026 - Jul 2026 (1 month)

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

GL

Node.js Developer

Globant

Jan 2022 - Mar 2024 (2 years 2 months)

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.

TU

Backend Developer

Tul

Sep 2020 - Aug 2021 (11 months)

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.

Education

Degrees, certifications, and relevant coursework

AE

AWS Educate

Introduction to Generative AI, Generative AI

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

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