Welo Data

SDET - API/Middleware

Welo Data  •  $10/hr  •  Remote  •  3 hours ago
Apply
AI can make mistakes so check important info. Chat history is never stored.

Job Description

Welo Global is hiring an SDET (Software Development Engineer in Test) to bring deep technical rigor to middleware-layer testing. This role requires strong technical expertise across gRPC-Web, Proto3, HTTP/2, JSON-RPC/REST, proxy-based traffic inspection, and API scripting. The primary responsibility is to observe and reconstruct the network interactions generated by the onboarding UI, including request/response structures, schemas, headers, identifiers, Enums, and client-injected parameters. This is primarily an API/network analysis and evidence-generation role rather than a conventional UI automation or regression-testing role. The resource will produce sanitized network evidence and controlled, benign tracer replay scripts for downstream backend validation.

Project Details

Title: SDET - API/Middleware

Rate: $9.50/hr

Start Date: 19th October

Duration: 5 Weeks

Commitment: 35 Hours per Week

Location: India (Remote)

Job Type: Freelance

Responsibilities

  • Design, build, and maintain automated API test suites covering gRPC-Web, Proto3, HTTP/2, and JSON-RPC/REST based services
  • Export clean, sanitized HAR/network evidence while maintaining traceability between UI actions and corresponding network requests.
  • Map relevant schemas, headers, identifiers, routing information, and client-injected parameters.
  • Use proxy tools such as Mitmproxy, Charles Proxy, and browser DevTools to inspect, intercept, and validate network traffic between client and server
  • Develop and maintain API automation scripts using Python, Postman, and cURL for functional and regression testing
  • Analyze protocol-level request/response behavior to identify defects related to serialization, encoding, and transport
  • Inspect and validate request payload structure, including system-level headers (e.g., auth tokens, routing identifiers) and internal/hidden parameters, ensuring correct handling under both valid and malformed conditions
  • Collaborate with backend and middleware engineers to define testable contracts and edge-case scenarios
  • Continuously improve test automation frameworks for reliability, speed, and maintainability
  • Document technical findings, automation coverage, and known protocol-level limitations

Required Qualifications

  • Strong hands-on expertise of 3-5+ years with gRPC-Web, Proto3, HTTP/2, and JSON-RPC/REST protocols
  • Proficiency with proxy/traffic inspection tools including Mitmproxy, Charles Proxy, and browser DevTools
  • Solid scripting/programming skills in Python, with practical use of Postman and cURL for API automation
  • Experience designing and maintaining automated test suites for middleware or API-layer services
  • Working understanding of API request structure, including headers, auth tokens, and internal/system parameters, and how to test for their correct handling
  • Understanding of software engineering practices as applied to test automation (version control, CI integration, code review)
  • Strong debugging skills at the network/protocol level
  • Experience analysing browser-generated network traffic and reconstructing API behaviour is strongly preferred.
  • Experience with HAR analysis, API schema reconstruction, or controlled API replay is strongly preferred.
  • Ability to work within approved staging/test environments and follow defined data-handling and test-authorization requirements is required.
Welo Data

About Welo Data

With 27+ years of experience, Welo Data is the human-centered infrastructure for globally effective AI. We fuel AI/ML and GenAI innovation through scalable, high-precision training data and multilingual expertise. Our network of 500,000+ expert evaluators and domain specialists across 105 countries ensures diverse and reliable AI solutions.

Welo Data, a Welo Global brand, delivers a comprehensive spectrum of AI data services—including data annotation and labeling, LLM enhancement, data collection and generation, and relevance and intent assessment.

With 14 secure facilities globally, 7 ISO certifications, and 24/7/365 support, we consistently deliver quality measures across scaled programs and complex, emerging projects.

Leading technology innovators, including Google, Spotify, Amazon, Workday, Squarespace, and Dropbox, trust Welo Data. Our enterprise-grade solutions empower organizations to unlock the full potential of their data and AI initiatives while maintaining the highest standards of quality and ethical responsibility.

By joining Welo Data, you will obtain:

- Limitless FLEXIBILITY: Work on projects at the times that work best for you, with clear guidelines and transparent pay.

- Limitless GROWTH: Access to optional learning resources and guidance to expand your skills with each project you complete.

- Limitless SUPPORT: Connect with a global community and receive responsive assistance whenever you have questions.

Welo Data is redefining how AI learns and how people thrive in shaping it.

Follow us for enterprise AI insights, global job opportunities, and stories from our community.

Limitless AI. Limitless You.

Industry
IT & Software
Company Size
501-1,000 employees
Headquarters
Unknown
Year Founded
Unknown
Social Media