Job description
Description
Callstack was founded in 2016 by Mike Grabowski and Anna Lankauf . Our company provides top cross-platform consultancy &development in React.js and React Native. We co-create the technology and collaborate with the Meta team on shaping the technology as core contributors and innovators.
Our main goal is to drive and accelerate software development innovation. To achieve that, we follow our major rule:
We don’t follow best practices. We set them!
Callstack also organizes React Universe Conf - the only community- driven and fully dedicated to React Native conference in Europe.
What is unique about working at Callstack?
You will work with the best React Native experts on applications used by millions worldwide.
You can develop your own ideas in our R&D program. If you want to bring your visions to life - Callstack will support you.
You have a possibility to contribute to our projects in Open Source like React Native Paper, Linaria, RN Testing Library etc.
There are plenty of possibilities to showcase your expertise: You can speak at our React Universe Conf, be featured in our blog, or React Universe On Air episode.
You are the one to decide in which area you want to grow, you’ll have an individual self-development budget to upgrade your soft skills, managing skills or become a Mentor in the future.
Join us and work with the TOP Silicon Valley and Fortune 500 companies in the USA!
As a Staff QA Engineer (with AI) you will:
Re-imagine the QA stack with AI, introduce LLM-powered test-case generation, self-healing test suites, autonomous root-cause analysis, and visual-regression diffing driven by computer vision
Define company-wide best practices for AI-assisted testing, covering unit, integration, E2E, performance, security, and bias/ethical checks for ML models
Own the QA architecture across web, mobile, API, and ML pipelines - selecting the right mix of open-source tools (e.g., Playwright, Appium, GPTDriver, Maestro)
Embed quality gates into CI/CD (GitHub Actions, GitLab CI, Jenkins, or Azure Workflows)
Build evaluation frameworks for LLM features (response accuracy, toxicity, hallucination rate, guard-rail coverage) and automate regression baselines
Collaborate closely with Developers, DevOps, and Product Owners to instill a “shift-left” quality culture from design through production
Lead internal QA guilds & workshops, sharing new AI testing patterns, code snippets, and lessons learned
Contribute to open source - submit PRs, maintain plugins, and publish tools that push the testing community forward
Speak at meetups & conferences to evangelize AI-first QA practices
Requirements
You are the right candidate if you are:
A QA engineer with 10+ years in automated testing (web, mobile, or API) and 2+ years integrating AI/ML into testing workflows.
Bachelor’s Degree, Master’s Degree or Ph. D in Computer Science, Data Science, Artificial Intelligence, or a related field
Experienced DevOps optimizing and scripting pipelines and workflows for other engineers
Fluent in a modern programming language used for tests (Python, TypeScript)
Hands-on with AI-focused testing tools (Prompt-based test generation or custom GPT-powered scripts)
Experienced in CI/CD, containerization, and cloud services
Passionate about quality for AI systems - you know how to measure hallucinations, bias, latency, and model drift
A clear communicator in English (B2+), able to explain why that edge-case matters to both engineers and execs
Proactive, analytical, and endlessly curious, always chasing the next flaky test until it’s gone
Fun to work with :)
Why work with us? Because you can:
Realize your potential in our R&D program
Work on software used by millions
Take part in our Open Source projects
Grow in your unique expert role
Code with the top experts and community leaders
Showcase your expertise by speaking at our conference, being featured in our blog or podcast episode
Co-create and shape core technology
Join the React Native community
Develop soft skills
What we offer:
24 paid days off & 30 days paid sick leave for B2B contractors
Fully-covered life insurance
Private healthcare for you and your family
Free access to mental health platform - Helping Hand
Multisport Card or monthly allowance for other sports activities
Individual Wellbeing & Development Budget
Monthly lunch allowance
Accounting costs refund for B2B contractors
Flexible working hours and fully remote work possibility
Cool office in Wrocław city center
Magnificent team events and activities
Company-wide workation and team building workshops
Top-notch hardware - Apple devices
Possibility to participate in React Universe Conf
