Carlos M. Ramseyer
Senior Ruby Developer
Project maintained by cmramseyer Hosted on GitHub Pages — Theme by mattgraham
Senior Ruby on Rails Developer with 12+ years of software development experience building and maintaining complex systems, including legacy applications, third-party integrations, performance-critical workloads, and products built from scratch. Experienced in technical leadership, cross-team coordination, safe production releases, and full-stack development with React.
Technical Skills
- Ruby on Rails, PostgreSQL, Elasticsearch, RSpec, Selenium, Redis, Sidekiq, Action Cable
- React, TypeScript, TanStack Query
- Kafka, Docker, AWS, CI/CD, OpenAPI/Swagger
Professional Experience
Lead Ruby on Rails Developer
MajorKey Technologies (www.majorkeytech.com)
(Apr. 2021 - Oct. 2025)
Worked on a financial advisor dashboard as a Senior Ruby on Rails developer, taking a lead role within the team.
Onboarded developers and worked closely with Product Owners to assess feasibility, clarify requirements, break down epics, estimate work, and define implementation strategies.
Coordinated development across multiple teams when features or production issues affected several applications and services. Helped identify deployment risks, define rollback strategies, and improve the team’s approach to PR reviews, backlog grooming, and complex development tasks.
Improved performance in a ~2.5 TB PostgreSQL database, including refactoring expensive data access patterns into materialized views where appropriate.
Implemented React features and frontend improvements.
Senior Ruby on Rails Developer
IT Crowd (www.itcrowd.dev)
(Feb. 2019 - Mar. 2021)
Built and deployed a resource search application from scratch on AWS EC2 using Elasticsearch, with role-based access control (RBAC), asynchronous notifications, and usage dashboards with charts and statistics.
Proposed product and technical alternatives in the absence of a Business Analyst, helping the Product Owner clarify requirements and evaluate feature options.
Built a chatbot with AWS Lex.
Maintained a legacy medical appointment application with multiple third-party API integrations.
Mid-Level Ruby on Rails Developer
Fontela Cristales (www.fontela.com.ar)
(Feb. 2014 - Feb. 2019)
Built a glass manufacturing management system from scratch to track production across multiple factory stages.
Implemented real-time order tracking, production progress monitoring, and centralized operational information for factory workers, administrative staff, and management.
Integrated the application with Opty-Way glass-cutting software and the Tango Gestión billing system.
QA Automation Tester
Neoris (www.neoris.com)
(Sep. 2011 - Feb. 2013)
Automated testing with Selenium.
Portfolio
GitHub
Glass Demo App
Functional demo hosted in Digital Ocean. Orders tracking system. Charts, statistics, WebSockets, PDF reports, Zebra labels, async tasks.
Link
User: curriculum
Password: cv1234