---
title: 'SDET - API/Middleware (India) at Welo Global'
canonical: 'https://feeny.ai/job/sdet-api-middleware-india-welo-global-india-wvvvf4wgtn7y'
type: 'job'
last_seen: '2026-10-12'
---

# SDET - API/Middleware (India) at Welo Global

- **Company:** Welo Global
- **Location:** India
- **Employment:** freelance
- **Work type:** remote
- **Posted:** 2026-09-28
- **Last confirmed live:** 2026-10-12
- **Apply:** https://jobs.lever.co/weloglobal/4e44dc60-5c7f-4b2e-9794-e922bd082f92

## Job description

Job Overview 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 (with the possibility of full time employment based on performance and project needs in all opportunity)

## 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

#L1-CC1

Why join Welo Data? ✨ Limitless Flexibility: Work on projects that fit your schedule while collaborating with a global leader in AI data services and localization. 🌱 Limitless Growth: Apply your skills, access diverse content types, develop through structured learning, and explore career paths that can lead to permanent roles. 🌍 Limitless Support: Be part of a global community with real-time assistance from our Community Experience team.

How to Apply? Apply now by answering a few quick questions to join our database and become part of our growing community.

We can’t wait to meet you!

## About Welo Data

Welo Data, part of Welocalize, is a global AI data company with 500,000+ contributors delivering high-quality, ethical data to train the world’s most advanced AI systems. We’re building smarter, more human AI with a diverse community in 100+ countries.

At Welo Data, Limitless AI. Limitless You. isn’t just a slogan—it’s our promise. We build smarter AI through the power of human contribution, offering limitless opportunities for our global community to grow, contribute, and work on their terms.

## About Welo Global

## Company Overview
- **One-liner**: Welo Global delivers enterprise localization, AI training data, multilingual content, and intellectual property solutions through a portfolio of specialized global brands.
- **Entity Type**: Private (Privately Held)
- **Headquarters**: Not publicly available (global operations across multiple countries)
- **Founded**: Not publicly available (earliest known employee joined in 2002)
- **Founders**: Not publicly available

## Core Business
- **Primary industries**: Language Services, Localization, AI Training Data, Intellectual Property, Digital Marketing, Life Sciences
- **Target customers**: B2B – enterprise localization teams, AI/ML labs, law firms and corporate legal departments, pharmaceutical and medical device companies, global marketing teams
- **Mission or purpose**: To help organizations operate and scale globally by combining human expertise with advanced AI and technology, while fostering sustainability and inclusion.

## Products & Services
For each major offering:
- **Welocalize**: AI-enabled multilingual content and localization solutions for enterprises, powered by the Opal Platform (an agentic system orchestrating AI, automation, and human expertise). Serves localization teams in 300+ languages.
- **Welo Data**: Multilingual data generation, evaluation, and human data infrastructure for AI systems. Provides a network of 500,000+ vetted experts and a proprietary quality framework (NIMO™). Supports foundation labs and enterprises deploying GenAI.
- **Park IP**: Global IP solutions for law firms and corporate legal departments, including patent translation, foreign filing, and litigation support. Uses the Legal Studio platform for portfolio management.
- **Welo Life Sciences**: Specialized language solutions for highly regulated industries (clinical trials, pharmaceuticals, medical devices). Includes translation, linguistic validation, and regulatory content services.
- **Adapt**: Multilingual digital performance marketing agency. Offers paid search, SEO, programmatic, paid social, and content marketing. Uses Adapt Studio, a translation platform built for marketers.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Serves over 2,000 clients in 300+ languages; employs a network of 500,000+ linguists and domain experts
- **Notable Investors/Partners**: Not publicly available (private company)
- **Growth Signals**: 
  - Holds 7 ISO certifications (including ISO 14001 for environmental management)
  - Voluntarily discloses carbon emissions (Scope 1, 2, 3)
  - Actively expanding AI training data and GenAI evaluation services
  - LinkedIn reports 35 employees (likely corporate HQ), while the careers page lists over 1,500 corporate jobs globally – indicating a much larger workforce

## Competitive Advantages
- **Portfolio of specialized brands** – each brand targets a distinct, regulated vertical with deep expertise and fit-for-purpose technology.
- **Massive global network** – 500,000+ vetted linguists and domain experts across 300+ languages.
- **AI-first technology** – Proprietary platforms (Opal, NIMO, Adapt Studio, Legal Studio) that integrate generative AI, automation, and human judgment.
- **Compliance and security** – 7 ISO certifications (including ISO 14001) and a strong focus on data security, ethical AI, and sustainability.
- **Longevity and scale** – Established over 20 years with a track record of serving Fortune 500 and Am Law 100 clients.

## Strategic Focus
- **AI training data and evaluation** – Growing its Welo Data brand to support foundation labs and enterprises deploying GenAI, with a focus on safety, bias mitigation, and cross-lingual reliability.
- **Product-led innovation** – Enhancing the Opal Platform and other agentic systems to automate multilingual content workflows.
- **Sustainability** – Maintaining ISO 14001 certification, voluntarily reporting carbon emissions, and expanding the Give Grant program for employee-selected charities.
- **Global scalability** – Continuing to build a diverse, remote-friendly workforce across 8+ countries.

## Why Work Here
- **Remote-first culture** – Many positions are work-from-home; the company emphasizes global teamwork and flexibility.
- **Diversity and inclusion** – “Come as you are” motto; active Give Grant program for employee-funded donations; commitment to hiring a diverse workforce.
- **Sustainability focus** – ISO 14001 certified, with voluntary carbon disclosure and environmental initiatives.
- **Career growth** – Opportunities across 1,500+ corporate roles worldwide in localization, AI, technology, marketing, and legal services.
- **Learning environment** – Continuous learning encouraged; access to cutting-edge AI and multilingual technologies.

## Sources
1. [weloglobal.com](https://www.weloglobal.com/company/)
2. [weloglobal.com](https://www.weloglobal.com/company/careers/)
3. [weloglobal.com](https://www.weloglobal.com/portfolio/)
4. [linkedin.com](https://www.linkedin.com/company/welo-global)
5. [jobs.lever.co](https://jobs.lever.co/weloglobal)

## Other roles at Welo Global

- [Bilingual Metadata Specialist (India)](https://feeny.ai/job/bilingual-metadata-specialist-india-welo-global-india-3ejjkhhhgn98) — India
- [MSR Project - Chinese Culture Expert](https://feeny.ai/job/msr-project-chinese-culture-expert-welo-global-australia-vv818ry2d2zx) — Australia
- [MSR Project - English (United Kingdom) Culture Expert](https://feeny.ai/job/msr-project-english-united-kingdom-culture-expert-welo-global-united-kingdom-x6093d7n8058) — United Kingdom
- [Hindi Content Specialist](https://feeny.ai/job/hindi-content-specialist-welo-global-united-states-sgqj8ccdgpws) — United States
- [English to Estonian Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-estonian-review-lead-for-ui-marketing-product-content-welo-global-57da7n9zxjpa) — Global
- [English to Uzbek (Cyrillic) Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-uzbek-cyrillic-review-lead-for-ui-marketing-product-content-welo-04fcaazemmd7) — Global
- [English to Serbian (Cyrillic) Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-serbian-cyrillic-review-lead-for-ui-marketing-product-content-welo-2gp0kkbc10mp) — Global
- [English to Slovenian Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-slovenian-review-lead-for-ui-marketing-product-content-welo-global-vcedd6dd5n3h) — Global
- [English to Slovak Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-slovak-review-lead-for-ui-marketing-product-content-welo-global-04hpw2vfbv1k) — Global
- [English to Maltese Review Lead for UI, Marketing & Product Content](https://feeny.ai/job/english-to-maltese-review-lead-for-ui-marketing-product-content-welo-global-sdkr2b31dcrr) — Global