QA Engineer for High-Trust Digital Products
Mobile QA specialist with deep expertise in manual testing, API validation, and enterprise systems. Building quality into fintech, payments, and transactional products that millions depend on.
Watch My Introduction
A quick intro about who I am and what I bring to the table
Why Work With Me
Recruiter Snapshot
Enterprise QA Mindset
Experience validating complex enterprise systems where quality directly impacts revenue, user trust, and regulatory compliance.
Technical Depth Beyond Testing
Full-stack development background enables understanding of system architecture, API integrations, and root cause analysis.
Bilingual Communication
Fluent in English and Spanish, enabling seamless collaboration with international teams, stakeholders, and documentation.
Ownership in Critical Products
Track record of taking ownership in transactional systems where errors directly impact customers and business outcomes.
Professional Journey
Experience Timeline
Bancolombia
QA Mobile
- Lead mobile quality assurance for flagship banking applications serving millions of users
- Design and execute comprehensive test strategies for critical financial transactions
- Collaborate with cross-functional teams to ensure seamless user experiences
- Validate end-to-end payment flows and security-critical features
Choucair Testing
Senior Quality Assurance Engineer
- Owned QA strategy for enterprise clients in financial and retail sectors
- Established testing frameworks and best practices for complex integrations
- Mentored junior QA engineers and promoted quality-first culture
- Delivered high-coverage test documentation and regression suites
Globant
Test Automation Engineer
- Built automated testing solutions for global enterprise clients
- Integrated CI/CD pipelines with comprehensive test coverage
- Reduced regression testing time through strategic automation
- Collaborated with development teams on testability and quality gates
Study Now Brasil
Full Stack Developer / Tech Lead
- Led technical architecture and development of education platform
- Implemented quality processes from a developer perspective
- Managed cross-functional team delivery and technical decisions
Lab Cortex
Solutions Developer
- Developed custom software solutions for diverse client requirements
- Built foundation in full-stack development and system design
- Gained understanding of software lifecycle from both sides
What I Bring
Core QA Capabilities
Manual Testing
Comprehensive exploratory and scripted testing with meticulous attention to user flows, edge cases, and business requirements.
Functional & Regression Testing
Systematic validation of features and regression suites ensuring stability across releases and integrations.
API & Backend Validation
Deep validation of REST APIs, data integrity, and backend services with understanding of system architecture.
Defect Tracking & Documentation
Clear, actionable bug reports and comprehensive test documentation that accelerates resolution cycles.
Mobile QA
Native and hybrid mobile testing across iOS and Android platforms with focus on performance and usability.
Agile & Scrum Collaboration
Active participation in sprint ceremonies, continuous feedback loops, and cross-functional team alignment.
Test Strategy & Ownership
End-to-end ownership of quality processes from planning to execution to release validation.
Technical Communication
Bridge between technical teams and stakeholders with clear, precise communication in English and Spanish.
Industry Focus
QA Excellence for Payments, Fintech & Transactional Systems
In fintech and payments, there is no margin for error. Every transaction represents a customer's trust, and every bug can translate to financial loss or compliance risk. My experience at Bancolombia has given me deep understanding of what it takes to maintain quality in these environments.
I bring meticulous attention to critical user flows: checkout processes, payment validations, account operations, and security-sensitive features. My technical background allows me to validate not just the UI but also the API contracts, data integrity, and integration points that make these systems reliable.
Whether it's e-commerce checkout optimization, mobile banking features, or enterprise payment processing, I understand that quality is not just about finding bugs—it's about protecting revenue, maintaining regulatory compliance, and earning customer confidence.
Security-First Testing
Validation of authentication, authorization, and data protection
Performance Focus
Ensuring speed and reliability under high transaction volumes
Integration Expertise
Testing complex API ecosystems and third-party services
Business Impact Awareness
Understanding quality metrics that matter to stakeholders
Track Record
Proof of Value
Enterprise-Grade Quality
Supported quality assurance for high-trust digital experiences at one of Latin America's largest financial institutions.
Developer Perspective
Combined QA expertise with full-stack development knowledge, enabling deeper technical conversations and root cause analysis.
Cross-Platform Validation
Contributed to robust validation across mobile and web flows, ensuring consistent experiences across all touchpoints.
Stakeholder Bridge
Able to translate business expectations into technical requirements and vice versa, facilitating alignment across teams.
Toolkit
Tools & Environment
QA Methodologies
Technical Skills
Collaboration
Languages
About Me
David Guio
I'm a QA Engineer based in Colombia with a unique background that combines software development expertise with quality assurance mastery. This dual perspective allows me to understand products from both the technical implementation and quality validation sides.
Currently at Bancolombia, I specialize in mobile QA for financial applications where reliability and security are non-negotiable. My experience spans enterprise environments, fintech systems, and high-volume transactional platforms.
I believe quality is not just about finding bugs—it's about understanding systems deeply enough to prevent them. I bring an ownership mindset to every project, treating product quality as my personal responsibility rather than a checkbox activity.
Fluent in both English and Spanish, I thrive in international, remote teams where clear communication and cultural adaptability are essential for success.
Get in Touch
Let's Build Reliable Digital Products
Open to opportunities in remote QA, fintech, mobile QA, enterprise systems, and international teams. Let's discuss how I can contribute to your product quality.