QA Engineer

Responsibilities

You will own the quality assurance process across the full release cycle for high-scale mobile and API products. This involves performing manual testing, designing test documentation, and collaborating with cross-functional teams to ensure reliability and security.

Requirements

The role requires 3+ years of hands-on QA experience with mobile, web, and API testing platforms. Candidates must be proficient in English and possess experience with bug tracking systems and modern QA tools including AI-driven testing approaches.

Skills

• Manual testing
• Mobile testing
• API testing
• REST
• GraphQL
• Charles Proxy
• Fiddler
• Proxyman
• Test documentation
• Bug tracking
• Test management
• Agile
• Scrum
• Kanban
• Communication skills
• Quality assurance

Benefits

• Remote flexibility
• Competitive salary
• Medical insurance
• Learning investment
• Professional development
• English classes

About this role

Description:
THE PLACE
ITRex - AI pioneers who build systems that actually work in the real world, not just in demos. We're 200+ people spread across the US and Europe, creating solutions for companies like P&G and Shutterstock. We keep it simple, build it right, and focus on what works.
THE PEOPLE
We're the kind of people who don't ignore messages in Slack, who jump in to help when you're stuck on a problem, and who offer solutions instead of blame when things go sideways. We believe in openness, accountability, and having each other's backs. No office politics, no hidden agendas - just people who care about doing good work together and supporting each other to get there.
THE ROLE
We are looking for a QA Engineer to join a high-scale product in the digital finance / blockchain domain.
Our client is a globally distributed tech company building high-load, security-critical solutions used by millions of users. The product ecosystem is with a strong focus on mobile.
You will own quality across the full release cycle, working closely with engineering, product, and stakeholders. Your work will directly impact the reliability and security of large-scale financial systems.
Responsibilities:
Perform manual testing of mobile and APIs (REST, GraphQL)
Design, execute, and maintain comprehensive Test Documentation
Use AI tools as part of the QA toolkit to enhance test coverage and efficiency
Collaborate closely with developers, product managers, and stakeholders to ensure product quality
Define and establish QA processes and best practices for new projects
Act as the sole QA when required, owning the end-to-end testing process
Contribute as part of a QA team, ensuring alignment with shared goals and standards
Work with product requirements together with the team during backlog refinement
Participate in Agile ceremonies and provide input on quality-related risks
Technical Skills
3+ years of hands-on QA experience
Strong experience in manual testing across multiple platforms: Mobile applications (iOS/Android), Web applications, APIs (REST, GraphQL, etc.)
Experience working with traffic sniffers / proxy tools such as Charles Proxy, Fiddler, Proxyman, etc
Hands-on experience applying an agentic approach across the SDLC (e.g., Claude Code, AI agents for test design, execution, and defect analysis)
Ability to design, execute, and maintain comprehensive test documentation
Familiarity with bug tracking and test management systems (e.g., Zephyr, Qase, Test Trello)
Understanding of SDLC and QA’s role within Agile, Scrum, or Kanban environments
Business & Collaboration
Excellent communication skills, both verbal and written, with an ability to convey information clearly and concisely
Product-oriented and collaborative mindset, effective in Agile cross-functional environments
Strong attention to detail and ownership of quality
Ability to stay effective under deadlines and production pressure
Self-driven and proactive, able to operate independently within a defined framework
English proficiency: Upper-intermediate and above
Nice to have:
Experience with mobile test automation
Hands-on experience building/integrating skills & agents
Knowledge of performance and security testing
Experience with crypto testing
Benefits:
Why people stay
First, the foundation:
Remote flexibility: Work where and how you work best - we trust you to deliver
Fair compensation: Competitive salary + benefits that matter (medical, learning)
Then, the growth:
Ownership opportunities: See a problem worth solving? Own it. We back smart risks over bureaucratic safety
AI enhancement: We leverage AI to make you faster and stronger - complementing your abilities, not replacing them
Learning investment: English classes, professional development
Career progression: Real paths up, not just sideways shuffling
Finally, the people:
Responsive teammates: No ignored Slacks, no "not my problem" attitudes
Supportive culture: When you're stuck, people help. When things break, we fix them together
Human connections: Regular meetups, tech talks, and actual relationships beyond work
Curious? We are too. Let's talk

About ITRex Group

Software Development · 201-500 employees · headquartered in Sacramento, California · founded 2009