Senior Software Engineer, Backend (Test Enablers)
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AffirmFintech
The majority of our roles can be located anywhere in Poland.Full-TimeSenior
Salary25666 - 35666 PLN per month gross permanent
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Job Details
- Experience
- 5+ years
- Required Skills
- PythonJavaKotlinCI/CDDistributed Systems
Requirements
- 5+ years of software engineering experience.
- Strong backend experience with Python, Kotlin, or Java.
- Experience designing, building, and operating distributed systems or platform infrastructure.
- Experience with developer tools, testing infrastructure, or test automation frameworks.
- Strong ownership and ability to drive ambiguous technical work to completion.
- Experience improving system reliability, observability, and operational maturity.
- Excellent written and verbal communication skills, including technical specs, RFCs, and ADRs.
- Strong engineering fundamentals in system design, debugging, and production operations.
- Familiarity with test data systems, mocks, contract testing, and CI/CD platforms.
Responsibilities
- Design, build, and maintain scalable systems for synthetic identities, test data seeding, mocking, load testing, and deterministic validation workflows.
- Evolve testing strategy from E2E-heavy validation toward component, integration, contract, performance, and targeted E2E testing.
- Build platform capabilities that make production-like load testing safer, more repeatable, and easier to operate.
- Partner with product engineering and infrastructure teams to improve test signal quality and support faster validation loops.
- Lead medium-to-large technical projects from ambiguous problem definition through rollout and operational ownership.
- Improve system reliability through dashboards, SLOs, alerts, runbooks, and clear ownership models.
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