Test Automation Engineer (C#) (B2B)

Responsibilities

We're looking for a Mid / Mid+ Automation Engineer to join the team building a checkout platform for merchants across Europe. Every release touches real money, so test automation isn't an add-on — it's how the team decides whether we ship.

• Shape how we test a .NET product that lives entirely in Azure — from unit tests through API, end-to-end and performance

• Write and maintain test suites in C# / .NET that run reliably in our Azure pipelines

• Look after our BDD layer (Cucumber + Groovy) — keep scenarios readable for product and reliable in CI

• Own performance and load testing in K6: realistic traffic models, regression runs, feedback to devs and architects

• Cover the typical failure modes of a payment system — timeouts, retries, idempotency, partial failures

• Support junior testers, raise the quality bar on test code, and lead grown-up conversations about risk — in payments a "low priority bug" can still mean lost revenue or a compliance problem

Qualifications

• Computer Science degree or equivalent experience and at least 3 years in QA automation with a production track record

• Hands-on with the .NET test ecosystem (xUnit / NUnit, SpecFlow or Reqnroll, Playwright or Selenium, RestSharp / WireMock .Net)

• Good C# 

• Experience with Cucumber and comfort with Groovy step definitions (or honest willingness to ramp up — we have an existing BDD suite)

• API testing (REST, async / event-driven) and performance testing with K6 (or strong JMeter / Gatling / Locust and willingness to move to K6)

• Azure as a daily environment: Azure DevOps or GitHub Actions, App Service / AKS / Functions, Application Insights as a real source of insight when things break

• CI/CD, Git, Docker, Agile + Jira / Azure Boards; English at a comfortable working level

• Fluency in Polish and very good communication in English

• Availability to work in a remote/hybrid mode. Remote workers, we invite to the office once every month
  
  Nice to have
   

• Prior exposure to payments / fintech (PCI-DSS, 3-D Secure, PSD2/SCA, tokenization)

• Security testing basics (OWASP Top 10, API Top 10)

• Chaos / resilience testing or contract testing (Pact)

• IaC (Bicep / Terraform) 

About Nexi Digital

Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.