Job Overview We are looking for a Senior SDET to test
the resilience and correctness of distributed backend systems
supporting a high-stakes account provisioning and onboarding
workflow. This role is focused on the execution of pre-approved,
benign tracer/replay scenarios against staging endpoints, analysis
of request/response behaviour, and documentation of observable
account/CID lifecycle and downstream state behaviour. The ideal
candidate has solid distributed-systems and API-testing experience
and maintains disciplined technical evidence capture and
traceability. This role is not intended to perform unrestricted
adversarial testing. Testing activities will be limited to approved
staging environments and pre-approved benign scenarios. Project
Details Title: Senior SDET Rate: $13.5/hr Start Date: 19th October
Duration: 5 Weeks Commitment : 33 Hours per Week Location: India
(Remote) Job Type: Freelance Responsibilities Analyze distributed
system APIs to validate correctness, consistency, and failure
handling across services involved in account creation, data
persistence, and related record-linking Execute pre-approved
request variations and boundary-validation scenarios using
sanitized tracer payloads against designated staging endpoints.
Investigate system behavior under malformed, malicious, or
unexpected inputs and document findings clearly Capture complete
request/response evidence, including HTTP status codes, latency,
headers, and payload bodies, subject to approved data-handling
requirements. Validate behavior of near-real-time inline checks
(evaluated within milliseconds at the gateway) as distinct from
longer-running background verification/risk pipelines (evaluated
over minutes to hours), confirming each layer of defense behaves as
expected Verify data persistence, referential integrity, and
correct linkage of related records/relationships written by backend




services during processing Execute controlled replay suites and
compare expected versus observed API behavior. Correlate replay
results with the API schemas and network evidence produced by the
Middleware SDET. Document observable account/CID lifecycle behavior
and downstream state changes for handoff Capture and archive test
logs and evidence in a structured, retrievable format to support
audits and post-incident reviews Collaborate with backend
engineering teams to reproduce, isolate, and validate fixes for
distributed-system defects Contribute to test strategy for
backend/middleware reliability, including failure-mode and
chaos-style testing Maintain traceability between test evidence,
defects, and system requirements Reconcile backend observations
with the frontend FSM and middleware/API evidence produced by
earlier workstreams. Required Qualifications Strong experience of
5-8+ years in testing distributed systems and analyzing
inter-service API behavior Hands-on experience with request payload
tampering, fuzzing, or adversarial API testing techniques
Understanding of layered defense architectures, including the
distinction between synchronous/inline validation and
asynchronous/background verification processes Familiarity with
testing data persistence and relational/hierarchical integrity in
backend data stores Demonstrated discipline in test log archival,
evidence capture, and structured documentation practices Solid
understanding of backend/middleware architecture, failure modes,
and system boundaries Familiarity with API testing tools and
scripting for building custom fuzzing/tampering test cases Strong
analytical and investigative skills for root-causing complex,
systemic defects Experience executing controlled API replay or
staging validation is strongly preferred. Experience correlating
API responses with observable application/account lifecycle states
is preferred. Experience supporting audit, compliance, or
evidence-based reporting requirements is a plus

📌 Senior Software Development Engineer in Test (New Delhi)
🏢 Welocalize
📍 New Delhi