+7 years of experience. I have a bachelor's degree in Science and Systems Engineering. Currently I live in Winnipeg, Manitoba. FullStack Web Developer.
Intuitiva S.A. - Guatemala, Guatemala. (Remotely).
Top Guatemala Company providing ERP & CRM and custom software services. 10 employees. 2000 active users per day. 500 request per minute to the systems.
Led development and maintenance of ZAURU, an enterprise ERP system serving 2,000+ daily active users with 500+ requests per minute.
Managed and mentored a development team for custom web applications integrated with the ERP & CRM APIs.
Set up and operate a Hasura GraphQL service over the company ERP, used by associated web applications to query and create data against the core system.
Designed and delivered 6 full e-commerce sites built with Webstudio, integrated with Payload CMS (fully customized and extended) and CRM APIs, using Payload CMS GraphQL to query and create content and data for those web applications.
Built and maintained cloud infrastructure on AWS: containerized services on ECS, asynchronous job and email queues with SQS, relational databases on RDS, and open-source services hosted on Lightsail, alongside Lambda and S3.
Own day-to-day CI/CD for web applications using GitHub Actions, from build and test through deployment to production.
Architected and built offline-first web applications using Electric SQL and TanStack DB, enabling full functionality without an internet connection.
Adopted and integrated modern tooling including React Router (framework mode), shadcn/ui, TanStack Query, and TanStack DB across new and existing projects.
Conducted extensive client-facing requirements gathering sessions with diverse stakeholder profiles, demonstrating strong emotional intelligence and professional composure.
Designed the team's AI-agent delivery workflow: coding agents work in isolated sandboxes on dedicated GitHub branches, exercise existing features through layered tests in their own environments, and open pull requests that pass an AI code-review agent before a final human review. Shared test and production systems stay untouched until a polished PR is ready to merge.
AI Highlight: Integrated Google's gemma_q4f16_embedding model to generate embedding vectors for all ERP items; built a search API that vectorizes user queries at runtime and computes similarity scores against the item vectors enabling semantic, fuzzy-text search across online stores beyond exact keyword matching.
AI Highlight: Designed an isolated, human-in-the-loop delivery pipeline for coding agents using Cursor, GitHub Copilot, OpenCode, and a self-hosted Ollama server running Qwen: each agent works in its own sandbox and GitHub branch, runs layered tests against existing features in a disposable environment that never touches shared staging or production, then opens a pull request that is first reviewed by an AI code-review agent and finally by a human. Agent PRs arrive already tested and reviewed.
Red River College - Winnipeg, Manitoba
Red River College (RRC) is a leading institution in Manitoba, Canada, offering comprehensive educational programs designed to provide students with hands-on, practical skills. The Full Stack Web Development program equips students with the expertise to design, develop, and deploy dynamic web applications.
WEBD-3010 - Web Development 3: Taught REST-based Python APIs, CI/CD pipelines, and cloud infrastructure. Guided students in developing full web applications using Python frameworks.
WEBD-3012 - Business Systems Build and Testing: Instructed deployment strategies, quality assurance, testing methodologies, and best practices culminating in portfolio website launches.
WEBD-2010 - Project Management & Agile Business Analysis: Covered project management fundamentals, agile methodologies, stakeholder collaboration, and delivering business value.
Public Ministry of Guatemala. - Guatemala, Guatemala. (In person).
Branch of the Government dedicated to ensuring compliance with justice in the country. Approx. 70 Tech employees. 1500 active users per day on the platforms.
Led and trained development teams to build new modules within ASTREA and AyudaGT justice platforms.
Developed a banking interconnection module with SIB (Superintendence of Banks), enabling prosecutors to request bank statements and financial transactions of suspects through judicial orders directly within the application.
Built an integration module with RENAP (National Registry of Persons) to retrieve citizen identification data and personal information for criminal investigations.
Designed and implemented intuitive, dynamic interfaces for MP employees, including an interactive Timeline feature that visualizes the complete criminal history and events associated with each suspect, using React with Material UI (MUI).
Implemented asynchronous messaging with AWS SQS for email delivery queues and high-concurrency service workloads used by many simultaneous users.
Operated relational databases on AWS RDS and hosted open-source services on AWS Lightsail supporting production justice applications.
Conducted requirements gathering sessions directly with MP stakeholders and end-users to ensure developed features met operational needs.
My name is Oscar René, but everyone calls me Koka. I'm passionate about web development & Teaching. I taught WEBD-3012, WEBD-3010 and WEBD-2010 at Red River College (Winnipeg, Manitoba) as a part-time instructor from May 2024 to June 2025.
Some of my successes include the creation of ASTREA and AYUDA.GT, two systems used nationally in Guatemala for reporting and assisting victims, in collaboration with Justice Education Society and the Public Ministry of Guatemala.
