Mid QA Engineer at Opensignal – Warsaw | Jobyssey

Salary ranges:
13,000-16,000 PLN on B2B

Purpose of Role
We are looking for a Mid QA Engineer to join our QA team and support quality across data-driven and web applications.

In this role, you will initially focus on database test analysis and development, working with tests written in Python and validating data using SQL. Over time, the role will also expand into web application testing, including Playwright/TypeScript automation and manual feature testing.

This is a good fit for someone who enjoys technical QA work, understands testing fundamentals, is comfortable working with data, and can use AI tools effectively in day-to-day engineering tasks.

What you will be doing

Analysing, maintaining and extending automated database tests written in Python
Verifying data correctness using SQL and investigating data-related issues
Supporting test coverage for data processing and database-related logic
Creating and maintaining automated tests, initially focused on DB tests and later also E2E/UI tests
Performing manual feature, regression and UI testing for web applications
Supporting cross-browser and cross-application testing
Reporting, tracking and verifying bugs in Jira
Supporting releases, documentation and QA feedback loops
Collaborating closely with developers, QA engineers, product and data-focused teams
Using AI tools to support test analysis, test creation, debugging and day-to-day QA work

We are looking for:

2+ years of experience in QA, including manual and/or automated testing
Experience with test automation
Good understanding of testing concepts, test design and defect reporting
Basic to intermediate Python skills, or willingness to work with Python-based test automation
Practical SQL knowledge and experience working with relational databases
Ability to analyse data, investigate inconsistencies and reason about expected results
Strong logical and analytical thinking skills
Experience with UI and/or web application testing
Strong communication and collaboration skills
English at B2 level or higher

It would be nice to have

Experience with Playwright and TypeScript
Experience with CI/CD and GitHub/GitLab pipelines
Experience with database testing or data quality testing
Experience working with cross-functional engineering teams
Experience testing AI-powered features or using AI tools in QA workflows
Basic understanding of cloud-based or containerised environments

Tech stack

You do not need to know all of these technologies from day one, but these are the tools and technologies you may work with:

Python
SQL
PostgreSQL, BigQuery
Playwright, TypeScript
JavaScript
React, Node.js, Express
Docker, Kubernetes, GCP

About Us
Opensignal is the leading global provider of independent insight and data into network experience and market performance. Our user-centric approach allows communication providers to constantly improve their network and maximise commercial performance. Leading analysts, investors and financial institutions place a high value on our independent analysis, and we are regular contributors to their reports.

Real network experience is our focus, and ultimately that is what influences customer choice. Our mission is to advance connectivity for all. Here at Opensignal, the team is leading the industry in enabling operators to link their network experience and market performance in a way that has never before been possible.
With offices in Warsaw, London, Boston and Victoria, British Columbia, we are truly global, with employees working across four continents and representing over 25 nationalities. We are an equal opportunity employer dedicated to building an inclusive and diverse workforce.

Benefits

We believe we are stronger when we not only celebrate our many differences, values and voices, but include them in everyday practice. Having a diverse and inclusive culture is essential, which is why we offer a flexible approach to work-life balance, operating in a remote-hybrid way.

We also offer an attractive range of additional benefits, including:

95% remote work - the team meets in the Warsaw office once a month
Warsaw office in the Wola area
Kitchen and free coffee
Comprehensive private family healthcare package
Multisport Plus Card
Half-day Fridays

Explore more jobs