Juan Mones Ruiz

Hyros (ad-tracking and attribution SaaS) | Remote | May 2022 – Present

Technical Lead, Architecture Team, and HTalk responsibilities are concurrent where dates overlap.

Technical Lead | Apr 2024 – Present

• Technical lead across an engineering organization of 80+ engineers, providing technical direction to team leads. Set engineering standards and release processes, sign off on cross-team architecture decisions, and lead technical escalations and production incident response.
• Provide cross-team architecture and code reviews, technical mentorship, and technical interviews; standardized onboarding and documented engineering practices.
• Built and shipped a Model Context Protocol (MCP) server integration that lets clients generate Hyros reports from Claude.
• Built an LLM agent harness to migrate Spring tests to plain unit tests and an agent workflow that iterates on broken main-branch builds until they pass.

Architecture Team Lead | Jan 2024 – Present

Previously Software Engineer, Architecture Team | Jul 2022 – Jan 2024

• Led a zero-downtime utf8mb4 migration on production MySQL (hundreds of tables, billions of rows) with RDS Blue/Green after two earlier attempts had failed, opening up international markets.
• Own the architecture team's roadmap and design reviews, platform modernization, CI/CD, AWS infrastructure, and security.
• Co-led the Spring to Spring Boot migration with zero downtime, using a canary release on ECS. CPU on the tracking service dropped from about 45% to 23% under the same load.
• Led the Java 11 → 17 → 21 and Spring Boot 3 / Hibernate 6 upgrades across a 1M+ line Java codebase with no user impact.
• Upgraded MySQL 5.7 to 8 and encrypted the production DB at rest, both with zero downtime.
• Reduced AWS spend from ~$125k to ~$80k/month, saving ~$540k annually, by right-sizing databases, shutting QA down after hours, and building tooling that estimates and limits CloudWatch query costs up front (CloudWatch down 57%).
• Rebuilt auth with Spring Security, JWT, rotating refresh tokens and Google SSO, and led pentest fixes.
• Delivered SOC 2 controls: KMS key rotation, least-privilege IAM, jumpbox hardening and WAF tuning.
• Built the PR test pipeline on Bitbucket Pipelines (automated test runs, SonarCloud quality gates, required merge checks), cut CI time from 26.5 to 16 min, and raised test coverage from 30% to 65%+.
• Replaced the legacy JSP UI with a React app on S3/CloudFront; moved builds to esbuild (2 min to 400 ms).

Team Lead, HTalk (support-chat product) | Jan 2023 – Jun 2025

• Led the team behind HTalk, a Chrome extension with Slack and Intercom integrations. Took ownership of the legacy app in 2023 and relaunched it on a new Java backend and AWS stack in 2025.

Junior Software Developer | May 2022 – Jul 2022

FixRiver | DevOps & Cloud Architecture Consultant | Freelance, 2023 – Present

• Set up cloud infrastructure from scratch for multiple client projects, built to scale at low cost.
• Built CI/CD pipelines with automated rollback to prevent deployment-related downtime.
• Diagnosed production performance issues, set up monitoring dashboards, and made scaling decisions.
• Advised clients on system design and architecture early in new projects.