Junior QA Engineer, JavaScript

ButterCMS 🧈

Junior QA Engineer ensuring product quality at CKSource. Responsible for manual and automated testing of applications with the Cloud Services and Customer Portal projects.

Posted 7/3/2026full-timeRemote • 🇵🇱 PolandJunior💰 PLN 7,000 - PLN 10,500 per monthWebsite

About the role

Key responsibilities & impact

manual testing of our products
API testing
stress testing and regression testing
creating test automation and automation scripts
reporting and verifying issues in our issue trackers
supporting developers in customers’ technical support
communicating with the development team
improving your technical and soft skills

Requirements

What you’ll need

hobby-projects portfolio on GitHub in HTML / CSS / JS stack
practical experience with the code and understand how application work
practical JavaScript skills - comfortable with async code, working with HTTP clients, and reading & adapting existing code
solid understanding of how modern web apps work - SPA, REST APIs, HTTP, JWT, WebSockets
educational background in Computer Science or another technical field will be considered a strong advantage
experience in leveraging AI-powered tools (e.g., ChatGPT, Claude Code, Gemini)
love testing and breaking stuff :)
curiosity and critical thinking - you ask questions, dig into problems, and don't stop at 'it works on my machine'
fluent command of Polish and a good working proficiency in English (at least B2+ level)

Benefits

Comp & perks

B2B contract-based monthly remuneration is 7.000 - 10.500 PLN + VAT (or equivalent for Umowa o Pracę / Umowa Zlecenie)
quarterly and annual financial bonuses depending on the company’s performance
flexible schedule and the possibility to work fully remotely
professional development resources (up to 5 days of additional leave and 6 000 PLN yearly)
LinkedIn Learning access
extra leave for Tiugo Day - our company’s foundation day and your birthday
English lessons with a native speaker and an online language platform where you can learn English, Spanish, and German
access to a mental health and well-being platform with 24/7 dedicated psychological support
private medical care (Enel Med or Medicover) and Multisport card
2 weeks of paid parental leave for our contractors

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Manual TestingAPI TestingJavaScriptTest AutomationStress TestingRegression TestingHTTP ClientsREST APIsWebSocketsJWT

Soft Skills

CuriosityCritical ThinkingCommunication

Certifications

Educational Background in Computer Science