Senior Test Automation Engineer

co.brick talents — powered by AI, powered by people. We are seeking a technically mature Senior Test Automation Engineer to drive the quality assurance lifecycle, focusing heavily on backend/API validation (70%) while maintaining robust web and mobile frontend coverage (30%). In this role, you will go beyond executing standard test plans—you will architect and maintain scalable automated testing frameworks, integrate new performance or tooling proof-of-concepts, and actively mentor mid-level engineers. You will collaborate closely with cross-functional development squads to identify critical system paths, introduce stable quality gates, and champion software engineering best practices.

Details

Seniority: Senior (5+ years of commercial experience).

Allocation: Full-time (1 FTE).

Rate: Up to 120 PLN/h.

Start Date: ASAP.

Languages: English at a B2/C1 level (clear, effective communication across teams).

Work Model & Location: Hybrid. Required on-site presence at the client's office in Warsaw, Poland for 1 day every two weeks (specifically Thursdays), plus an additional 2–3 days on-site every 2–3 months for strategic planning sessions.

Responsibilities

Test Architecture & Strategy: Plan, design, and execute integration, system, usability, and End-to-End (E2E) testing suites. Support business units during User Acceptance Testing (UAT) phases.

Backend & API Automation ($70\\%$ Focus): Build and scale automated API test coverage, verifying data contracts, JSON payloads, and response structures.

Frontend & Mobile Automation ($30\\%$ Focus): Maintain and extend cross-browser web automation and native mobile testing workflows.

CI/CD & Pipeline Quality Gates: Embed automated tests seamlessly into distribution pipelines, ensuring high availability, continuous validation, and rapid feedback loops.

Performance Testing: Conduct load, stress, and scalability profiling to identify system bottlenecks.

Leadership & Code Quality: Lead technical code reviews, promote engineering design patterns, run exploratory PoCs for fresh technologies, and mentor team members to foster a proactive engineering culture.

Requirements

Core Development Baseline

Proficiency in Java and/or JavaScript (JS).

Strong understanding of clean code principles, OOP, SOLID, and KISS.

Advanced Git workflow mastery and experience handling code reviews.

API Testing & Automation

Expert knowledge of REST Assured and Postman.

Deep understanding of API response schemas and integration contract validation.

Automation Frameworks & Ecosystem

Web Front: Selenium / Selenide (primary web standard), Cypress, TestNG, JUnit, and Cucumber.

Mobile: Appium and XCUI

Test.

Test Management: Jira (highly preferred with Xray integration).

Comprehensive expertise spanning the entire Software Development Life Cycle (SDLC).

Performance & Pipelines

Gatling (the primary performance testing tool within the organization).

Expert control over CI/CD process chains and runner integration.

Nice to have: JMeter.

Soft Skills & Core Competencies

Strong mentorship attitude with a natural drive to support and upscale peer engineers.

Proactive mindset with excellent planning, prioritization, and analytical skills.

High adaptability—comfortable managing context-switching in a dynamic environment.