Senior Software Development Engineer in Test

For our client we are looking for Senior Software Development Engineer in Test.

Client is the emerging leader in the $100B+ cloud communications platform market. Customers like Airbnb, Viber, Whatsapp, Snapchat, and many others depend on our APIs and SDKs to connect with their customers all over the world. As businesses continue to shift to a real-time, customer-centric communications model, client is experiencing a time of impressive growth.

As a Software Development Engineer in Test, you will participate in application development and testing, ensuring continuous quality and testability and security of code throughout the software development lifecycle. You will be responsible for building quality within the software development process with automated testing suites, providing comprehensive support from code development through functionality. You will need to design, develop and maintain automated frameworks, test suites and scripts for continuous integration, testing, deployment and delivery.

What you'll do:

Your key responsibilities will include Driving Quality, Automation, and Reliability Strategic Leadership & Architecture:

● You will serve as a strategic leader and influential participant in architecture and design reviews for high-scale distributed systems.

● You will lead the design and evolution of next-generation, scalable, and self-healing test automation frameworks for microservices and event-driven pipelines, handling high-concurrency workloads.

● You will drive non-functional automation solutions, emphasizing redundancy, failover, and performance across cloud infrastructure.

● You will ensure testability during design reviews for new features, focusing on observability and verification for complex event-driven workflows.

● You will evaluate the impact of new features on existing tests and assess the feasibility of testing complex routing or decision engines.

Automation & Quality Infrastructure Ownership:

● You will own the "Quality Infrastructure," designing, developing, enhancing, and maintainingautomated frameworks and scalable test suites for continuous integration and delivery (CI/CD).● You will optimize CI/CD pipelines for fast feedback loops and ensure test environments are stable and production-representative.

● You will be responsible for Automated Test Case Creation, Test Planning, Test Development, and Test Execution.

● You will monitor global test results to identify failure or reliability trends and implement protocols to close systemic gaps.

● You will utilize observability tools to identify the root causes of test failures.

Reliability & Shift-Left Implementation:

● You will lead the transition from traditional QA to a reliability-focused testing model, including implementing Chaos Engineering and proactive monitoring to prevent customer-impacting failures.

● You will drive the implementation of "Shift Left" practices across the organization. Agile Execution & Process Improvement:

● You will participate in application development and testing as an active member of an Agile team.

● You will define testing requirements and develop test plans in close collaboration with Product and Engineering teams.

● You will define and uphold the "Definition of Done" and quality KPIs for the team, providing leadership with visibility into system health and release readiness.

● You will recommend and drive quality improvement initiatives and continuous process improvements to raise the standard of software company-wide.

● You will document, track, and escalate issues as appropriate; facilitate the tracking of bugs and enhancements using tools like JIRA, ensuring efficient issue handling.

● You will write high-quality documentation, including technical runbooks and solutions for observed issues.

Technology & Mentorship:

● You will evaluate and drive the adoption of new state-of-the-art testing technologies, such as contract testing or AI-driven debugging.

● You will own SDET support across multiple applications and system components, from ideation to deployment.

● You will demonstrate the ability to build effective relationships through partnering and collaboration with Product and Engineering teams.

● Provide guidance and mentorship to less experienced team members.

● Utilize and gain expertise in technologies such as AWS and GCP, Ansible, Puppet, Terraform, Kubernetes, Docker, Microservices Architecture, Relational and NoSQL Databases, Python, Java, and Go.

What you'll bring

● 8-10+ years of professional experience in software test automation, including designing, buildingand creating test frameworks

● Proven track record of designing, building, and creating enterprise-level test frameworks fromscratch.

● Design, Develop and Implement test automation frameworks and scripts at a highly proficientlevel

● High proficiency in Python and/or Java

● Good software development/scripting skills in common languages like Python, Go, JAVA,JavaScript /Typescript, etc.

● Experience with Cloud preferably Amazon Web Services (AWS) or Google Cloud Platform (GCP)or including serverless functions and containerized services

● Mastery of cloud-native services, including containerization (Docker, Kubernetes) and serverlessfunctions.

● Deep understanding of testing asynchronous, event-driven architectures including Pub/Sub,Cloud Tasks, or Kafka.

● Experience validating complex data models in SQL (PostgreSQL) and NoSQL (MongoDB, Redis,Datastore).

● Experience with testing applications with multi-tiered and distributed architecture, preferably withRestful Web Service API testing with knowledge of REST and/or SOAP APIs

● Experience with load, performance, chaos and scalability testing

● Documenting, tracking and escalating issues as appropriate with the ability to build effectiverelationships through partnering and collaboration

● Handling complex software system infrastructure tasks – from requirements to production.

● Experience in designing, developing, building and running a Continuous Integration Test system

● Experience with debugging and tracing distributed systems to identify issues with test failures

Nice to have:

● Experience with CI/CD tools such as GitHub Actions, Jenkins, or GCP Cloud Build.

● Familiarity with commerce systems, payment gateway integrations, and transaction lifecyclemanagement.

● Understanding of frontend frameworks like Vue.js to support a full-stack testing perspective.

● Experience with Load and Performance testing for high-traffic systems.

● Experience with Contract Testing (e.g., Pact) for multi-tiered and distributed architectures

● Experience in testing Kafka or similar queuing services

● Experience in Data Science or Big Data frameworks to support journey analytics

● Experience working with XML, XSLT, JSON

● Familiarity with SSO standards (SAML 2.0, OIDC) and API security/vulnerability testing.

Offer:

● Contract: B2B directly with US company

● Salary: up to 160 pln/h

● 100% remote

● Polish time zone

● Polish public holidays

● Long term cooperation

● Recruitment process: 1-2 technical calls