Senior SDET - Distributed API Testing (Remote)

Openkrill; United States; Remote; USD 3,031,000 - 3,237,000; Full time

Job summary

Welo Data seeks a Senior SDET to verify resilience and correctness of distributed backend systems supporting an onboarding workflow. You will run pre-approved tracer/replay scenarios against staging endpoints, capture complete evidence, and document API lifecycle and downstream state behavior.

The role emphasizes disciplined evidence capture, traceability, and collaboration with backend teams to reproduce and validate fixes, within a remote, freelance engagement.

Qualifications

• 5-8+ years testing distributed systems and API behavior.
• Hands-on with tampering, fuzzing, or adversarial API testing.
• Knowledge of layered defense, inline vs background verification.

Responsibilities

• Analyze distributed system APIs for correctness across services involved in account creation and data persistence.
• Execute pre-approved variations and boundary scenarios using sanitized tracer payloads on staging endpoints.
• Document observable account/CID lifecycle and downstream state changes.

Skills

Distributed systems testing

API testing

Test evidence capture

Documentation

Fuzzing

Tampering payloads

Job description

Welo Data seeks a Senior SDET to verify resilience and correctness of distributed backend systems supporting an onboarding workflow. You will run pre-approved tracer/replay scenarios against staging endpoints, capture complete evidence, and document API lifecycle and downstream state behavior.

The role emphasizes disciplined evidence capture, traceability, and collaboration with backend teams to reproduce and validate fixes, within a remote, freelance engagement.