Senior Software Development Engineer in Test

Welocalize India Llp; United States; Remote; USD 18,000 - 21,000; Full time

Job summary

Welocalize India Llp is seeking a Senior SDET to test distributed backend systems used in account provisioning workflows. The role focuses on benign tracer/replay testing in staging, analyzing request/response behavior, and documenting lifecycle and state changes.

The ideal candidate has strong distributed-systems and API-testing experience, with disciplined evidence capture and traceability. This is a remote India freelance engagement with a 5-week duration.

Qualifications

• 5-8+ years testing distributed systems and analyzing inter-service API behavior.
• Hands-on experience with payload tampering, fuzzing, or adversarial API testing.
• Understanding layered defense architectures with inline vs asynchronous validation.
• Experience with data persistence and relational integrity in backend stores.
• Disciplined test log archival and evidence capture practices.
• Solid knowledge of backend/middleware architecture and failure modes.
• Familiarity with API testing tools and scripting for fuzzing tasks.
• Strong analytical skills for root-cause analysis of complex defects.
• Experience with API replay or staging validation is preferred.
• Experience correlating API responses with lifecycle states is a plus.
• Audit/compliance/evidence-based reporting experience is beneficial.

Responsibilities

• Analyze distributed system APIs to validate correctness, consistency and failure handling.
• Execute pre-approved variations and boundary scenarios against staging endpoints.
• Investigate behavior under malformed inputs and document findings clearly.
• Capture complete request/response evidence including status codes, latency, and headers.
• Validate inline gateway checks and downstream verification pipelines.
• Verify data persistence and referential integrity across services.
• Execute controlled replay suites and compare expected versus observed API behavior.
• Correlate replay results with API schemas and middleware evidence.
• Document account/CID lifecycle behavior and downstream state changes for handoff.
• Archive test logs and evidence for audits and post-incident reviews.
• Collaborate with backend teams to reproduce, isolate, and validate fixes.
• Contribute to test strategy for reliability including failure-mode testing.
• Maintain traceability between test evidence, defects, and requirements.
• Reconcile backend observations with frontend and middleware evidence from prior workstreams.

Skills

Distributed systems testing

API testing

Test log archival

Evidence capture

Root-cause analysis

Chaos testing

Job description

Job Overview

We are looking for a SeniorSDETto 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 strong 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

• Analyzedistributed system APIs tovalidatecorrectness, 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 systembehaviorunder 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.
• Validatebehaviorof 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 ofdefensebehaves 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 APIbehavior.
• Correlate replay results with the API schemas and network evidence produced by the Middleware SDET.
• Document observable account/CID lifecyclebehaviorand downstream state changes for handoff
• Capture and archive test logs andevidencein a structured, retrievable format to support audits and post-incident reviews
• Collaborate with backend engineering teams to reproduce, isolate, andvalidatefixes 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 experienceof 5-8+ years intesting distributed systems andanalyzinginter-service APIbehavior
• Hands-on experience with request payload tampering, fuzzing, or adversarial API testing techniques
• Understanding of layereddefensearchitectures, 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