Alejandro Sierra

Sngular

• Own predictability and consistency across complex, multi-team programs; built a four-pillar measurement system (Impact, Efficiency, Quality, Velocity) auto-tracking DORA metrics across 52 Jira projects and 65+ GitLab repositories, with zero manual reporting effort.
• Act as the primary delivery point of contact for client stakeholders, presenting progress, metrics and strategy directly.
• Own Quality Strategy inside Delivery: redesigned the quality model across 25+ teams, resulting in 88% fewer production incidents, 863 defects stopped before reaching the business, and a 43% improvement in unit test quality.
• Designed and shipped an agentic QA pipeline (GenAI tooling in daily production use) that turns a functional spec into a full test suite (API, UI, mobile, performance and security) running across Claude Code, Gemini CLI and Antigravity.
• Contribute to the CTO Office, helping define technical strategy, standards and direction at the organizational level.
• Authored the AI skills the PMO uses to convert open-ended requirements into closed, estimable, fixed-price projects.
• Lead RFP & Pre-Sales, translating technical complexity into commercially meaningful client proposals.
• Manage and mentor engineers and QE professionals with individualized growth plans, moving profiles from manual testing into automation engineering; design and deliver internal training on automation, mutation testing and CI safeguards.

Sngular

• Led quality strategy, teams, budgets and client relationships across complex projects, defining testing strategy (e2e, API, mobile, performance, CI/CD) and driving scalable automation solutions.
• Supervised test plans and automated solutions built on SOLID principles and patterns such as Page Object Model and Screenplay.
• Designed monitoring strategies with Prometheus, Grafana and Kibana; built CI/CD pipelines and cloud-based testing using Docker and Kubernetes.
• Managed client relationships including SLA definition and technical proposals; conducted technical interviews and led talent development.

Tools: Selenium, Appium, Cypress, Playwright, Docker, Kubernetes, OpenShift, GitHub Actions, Jenkins, GitLab CI, JMeter, Gatling, BDD/TDD.

Orange Bank

• Acted as quality evangelist/ambassador across teams in an international, English-speaking environment; defined Acceptance Criteria and User Stories with PO/BA using Gherkin.
• Defined testing strategy aligned with DevOps practices and integrated automated tests into CI/CD pipelines (Jenkins, GitLab CI).
• Coordinated and led QA teams, managed defect lifecycle, and generated quality/performance reports; configured production monitoring with Prometheus and Grafana.
• Applied application security and DevSecOps practices using OWASP ZAP and Burp Suite; managed infrastructure as code with Terraform.

Tools: Selenium, Cucumber, TestNG, JUnit, Postman, Appium, Docker, Kubernetes, Terraform, Bash, Python, Go.

Devo

• Managed cloud infrastructure with Terraform on AWS (EKS, ECS) and container orchestration on Kubernetes using Flux and Helm charts.
• Owned Git workflows, version control and CI pipelines in GitLab; automated API testing with Python and monitored systems with Prometheus and Grafana.

TUI

• Administered AWS cloud services and Kubernetes clusters, including Helm-based application deployment; implemented infrastructure as code with Terraform (AWS, EKS).
• Built Bash/Python automation, managed Git/GitLab CI/CD pipelines, and worked across Redis, MongoDB, Oracle, SQL and PostgreSQL databases within Scrum/Kanban teams.