# Maykell Sánchez Romero **Senior Software Engineer, Ruby on Rails & React** - Email: kellsaro@gmail.com - LinkedIn: https://www.linkedin.com/in/kellsaro - GitHub: https://github.com/kellsaro - X: https://x.com/kellsaro - Website: https://kellsaro.github.io - Location: Ecuador, UTC-5 (within 1 hour of US Eastern time) - Availability: Open to remote roles ## Summary Senior software engineer and computer scientist with 15+ years building production systems, from a national immigration platform serving millions of users to AI-powered SaaS products. I specialize in Ruby on Rails and React, backed by solid Java experience, and build products end to end with a rigorous [AI-assisted engineering workflow](https://kellsaro.github.io/how-i-work/), which I am also using to move my stack toward Elixir and Phoenix LiveView. ## At a glance - **Role:** Senior Software Engineer - **Experience:** 15+ years building production systems - **Core stack:** Ruby on Rails, React and PostgreSQL, with solid Java (Spring Boot, Jakarta EE) - **Growing in:** Elixir and Phoenix LiveView, with two products built in it - **Way of working:** [AI-assisted engineering](https://kellsaro.github.io/how-i-work/) with specs, reviewed plans, cross-agent review and full test suites - **Location:** Ecuador, UTC-5 (within 1 hour of US Eastern time) - **Availability:** Open to remote roles - **Languages:** Spanish (native), English (professional) ## Current focus - **AI-assisted software engineering:** Agentic development with LLMs (Claude Code, Codex and others) for fast system development with accountability: specs, reviewed plans with checkpoints, cross-review by two agents, full test suites and security checks. - **Distributed systems:** Distributed systems architecture for fast, scalable, resilient, maintainable solutions. - **Elixir and Phoenix LiveView:** Growing toward Elixir as my next main stack, with two products already built in it. ## Technologies - **Backend:** Ruby, Ruby on Rails, Sidekiq, RSpec - **Frontend:** React, JavaScript, Hotwire (Turbo, Stimulus), Tailwind CSS - **AI engineering:** Claude Code, Codex, Windsurf, LLM APIs (OpenAI, Claude, Gemini), Spec-driven development, Cross-agent code review, Agent rules and skills - **Elixir (growing):** Elixir, Phoenix LiveView, Ash Framework, Oban - **Data & APIs:** PostgreSQL, Redis, MySQL, DB2, REST APIs, GraphQL, Payments (Stripe), ETL (Apache Hop, Looker Studio) - **Also strong in:** Java, Spring Boot, Jakarta EE - **DevOps & quality:** Docker, AWS (S3, EC2, RDS), Fly.io, Heroku, GitHub Actions (CI/CD), Git, Linux, Agile ## Projects ### Agonai Competitive intelligence system for the AI era. - Stack: Elixir, Phoenix LiveView, Ash, LLMs - Built for: ECEELI LLC - Details: https://kellsaro.github.io/projects/agonai/ - Website: https://agonai.io ### TechRepair Operations platform for wind turbine blade and tower maintenance teams, built around the work order lifecycle, where projects, teams, field activity and client reports converge. - Stack: Elixir, Phoenix LiveView, Ash, GraphQL - Built for: TechRepair LLC - Details: https://kellsaro.github.io/projects/techrepair/ - Website: https://techrepair.site ### Fundación Telefónica Dashboards KPIs on the effectiveness of educational programs for Fundación Telefónica Ecuador. - Stack: Apache Hop, Looker Studio - Built for: Fundación Telefónica Ecuador - Details: https://kellsaro.github.io/projects/fundacion-telefonica/ ### SIMIEC National immigration control system for Ecuador. - Stack: Java EE, C# / .NET, C++ - Built for: Ministerio del Interior, Ecuador - Details: https://kellsaro.github.io/projects/simiec/ ### Text Tools for Workdocs A monday.com app to review, transform and find-and-replace selected text without leaving the document. - Stack: React, monday.com - Built for: montools - Details: https://kellsaro.github.io/projects/text-tools/ ### SITRAN Custom ERP for tourism transportation at Transtur Varadero. - Stack: Ruby on Rails, PostgreSQL - Built for: Transtur Varadero - Details: https://kellsaro.github.io/projects/sitran/ ### LOTAIP Government transparency platform for public institutions in Ecuador. - Stack: Java - Details: https://kellsaro.github.io/projects/lotaip/ ### alas-HIS Hospital information system for healthcare institutions in Cuba. - Stack: Java, HL7 - Built for: Universidad de las Ciencias Informáticas - Details: https://kellsaro.github.io/projects/alas-his/ ## Experience ### Founder & Software Engineer, ECEELI LLC Mar 2026 - Present (8 mos), Remote Created [Agonai](https://kellsaro.github.io/projects/agonai/), a competitive intelligence and AI Visibility platform, directing its development with AI coding agents in Elixir, Phoenix LiveView and Ash. ### Ruby Developer, Globant Oct 2025 - Mar 2026 (6 mos), Remote Billing system migration for Postmark, from Stripe to Adyen, applying the Adapter pattern. ### Software Developer and Data Analyst, Kynsoft Sep 2024 - Oct 2025 (1 yr 2 mos), Remote Migrated around 7 million records from DB2 to PostgreSQL, including the ETL processes, with no data loss; Looker Studio dashboards for Fundación Telefónica Ecuador. ### Senior Ruby on Rails Developer, Dominion Global Aug 2022 - Jul 2024 (2 yrs), Remote Rails systems for global clients, external integrations and ETL pipelines. ### Senior Ruby on Rails Developer, Admios Aug 2019 - Jul 2022 (3 yrs), Remote Improved team productivity by 20% through automation tools. ### IT Analyst / Backend Java Developer, Ministerio del Interior, Ecuador Apr 2015 - Mar 2019 (4 yrs), Ecuador Architected [SIMIEC](https://kellsaro.github.io/projects/simiec/), the national immigration control system, serving millions of users with 99.9% uptime. ### Software Developer (Java), AEC Inter S.A. Jan 2015 - Dec 2015 (1 yr), Ecuador Architected the [LOTAIP](https://kellsaro.github.io/projects/lotaip/) government transparency system. ### Ruby on Rails Developer (Freelance), Gmixon Apr 2013 - Mar 2015 (2 yrs), Remote ### Ruby on Rails Engineer, Transtur Varadero Mar 2011 - Feb 2013 (2 yrs), Cuba Built the [SITRAN](https://kellsaro.github.io/projects/sitran/) ERP. ### Java Developer (Freelance), Peoplewalking 2010 - 2012 (2 yrs) ### Developer / Assistant Professor, Universidad de las Ciencias Informáticas Sep 2004 - Aug 2010 (6 yrs), Cuba Backend modules and HL7 integrations for [alas-HIS](https://kellsaro.github.io/projects/alas-his/). Full details of each role, with its stack: https://kellsaro.github.io/experience/ ## Education - Master in Software Development, University of Informatics Sciences, Cuba - Bachelor in Computer Science, University of Havana, Cuba ## Certifications - Triplebyte Certified Generalist Software Engineer - EF SET Certificate (Professional English) ## Languages - Spanish: Native - English: Professional - French: Basic - Italian: Basic ## How I work with AI I set the architecture, design principles and tools; specify each feature with expected results, examples and counterexamples; review and store the agent's plan before any code; implement point by point with traceability and a review at each checkpoint; review the code myself plus a cross-review by a second, different agent; and require new tests, the full test suite, linters, formatters and a security agent before staging and QA. Repeated problems become project rules and repeated tasks become agent skills. Details: https://kellsaro.github.io/how-i-work/ --- Source: https://kellsaro.github.io/ (updated October 2026)