QA and full-stack engineer with 5+ years of experience in test automation, API testing, and building cloud-native systems. I’ve delivered end-to-end quality and reliability across microservices, event-driven workflows, and CI/CD pipelines. I’m also the founder/lead engineer of Acceso, a production multi-tenant SaaS event ticketing platform—building features from payments and webhook fulfillment to security (mTLS and signed QR tickets) and omnichannel ticket delivery.…

Cesar Santana

QA and full-stack engineer with 5+ years of experience in test automation, API testing, and building cloud-native systems. I’ve delivered end-to-end quality and reliability across microservices, event-driven workflows, and CI/CD pipelines. I’m also the founder/lead engineer of Acceso, a production multi-tenant SaaS event ticketing platform—building features from payments and webhook fulfillment to security (mTLS and signed QR tickets) and omnichannel ticket delivery.…

Available to hire

QA and full-stack engineer with 5+ years of experience in test automation, API testing, and building cloud-native systems. I’ve delivered end-to-end quality and reliability across microservices, event-driven workflows, and CI/CD pipelines.

I’m also the founder/lead engineer of Acceso, a production multi-tenant SaaS event ticketing platform—building features from payments and webhook fulfillment to security (mTLS and signed QR tickets) and omnichannel ticket delivery.

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Skills

Experience Level

API
Expert
Jira
Expert
Python
Expert
AWS
Expert
TypeScript
Expert
React JS
Expert
Kubernetes
Expert
Stripe
Expert
PostgreSQL
Expert
SQL
Expert
GraphQL
Intermediate
Selenium
Intermediate
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Language

Spanish; Castilian
Fluent
English
Fluent

Work Experience

QA and Automation Engineer at Thryv
January 1, 2026 - Present
Designed and executed API testing strategies for microservices, validating endpoint contracts, request/response payloads, headers, and JWT/auth token flows using Postman and Python. Validated event-driven workflows on AWS SQS/SNS, ensuring reliable message publishing/consumption and robust error handling. Built Cypress UI automation suites for end-to-end flows executed in Kubernetes-hosted environments. Tested Salesforce CRM integrations by verifying data sync, field mappings, and business logic across connected systems. Performed backend data integrity validation using SQL and NoSQL queries, tracing defects to root cause. Managed Linux and Tomcat environments for test deployments using shell scripting to streamline setup and log analysis.
Quality Assurance Engineer at Neural Technologies Solution SRL
June 1, 2021 - December 1, 2025
Built and maintained automated test suites using Cypress to improve coverage and reduce manual regression effort. Designed and executed test plans for web and API features including REST and GraphQL using Postman and custom scripts. Tracked and triaged defects in Jira, coordinating with developers for timely fixes and post-release validation. Maintained test case repositories and quality metrics in Qase and Azure DevOps. Reviewed product requirements with PMs, developers, and designers to identify quality risks early in the SDLC. Investigated customer-reported issues and delivered root-cause analyses with follow-up test coverage.

Education

Bachelor of Science in Systems Engineering at Instituto Tecnologico de Santo Domingo (INTEC)
January 1, 2017 - January 1, 2021
English Language Certificate at Instituto Cultural Dominico Americano
January 11, 2030 - January 1, 2013

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services, Education, Financial Services, Media & Entertainment
    Acceso.do

    Project: Acceso — Multi-Tenant SaaS Event Ticketing Platform
    Role: Founder & Full-Stack Engineer | Solo project | Production
    Built a fully production-ready, multi-tenant SaaS ticketing platform from the ground up serving event organizers, venues, and customers in the Dominican Republic.
    Tech Stack:
    Next.js 16, React 19, TypeScript, PostgreSQL, Drizzle ORM, Tailwind CSS, Vercel, Supabase
    Key Technical Highlights:

    Architected a multi-tenant data model with 4-role RBAC (Super Admin, Organizer, Staff, Customer) and org-scoped data isolation enforced at the data access layer
    Integrated dual payment gateways (Stripe + Azul) with full 3D Secure 2.0 challenge flows, mutual TLS client certificates, webhook-driven order fulfillment, and PCI compliance documentation
    Built a cryptographic ticketing system using HMAC-SHA256 signed QR codes with signature rotation on transfer and revocation logic
    Designed a checkout reservation engine with concurrency controls and cart fingerprinting to prevent overselling under load
    Implemented a lottery/raffle allocation system for high-demand events with scheduled release windows
    Delivered omnichannel ticket delivery via transactional email (Resend) and WhatsApp Business API (Kapso)
    Built an offline-capable QR check-in scanning module with batch sync reconciliation for event staff
    Enforced 70% automated test coverage threshold using Vitest, Testing Library, and pg-mem (in-memory PostgreSQL)
    Deployed on Vercel with GitHub Actions CI/CD, Supabase storage, and scheduled cron jobs for cache warming and automated reminders
    Built fully bilingual (EN/ES) with next-intl, locale-based routing, and embeddable event widgets for third-party sites

    Scale & Ownership:
    Sole engineer, designer, product owner, and business operator. Managed everything from architecture decisions and payment compliance to marketing and customer relationships.