Senior JavaScript Developer at Nielsen

Mumbai, Maharashtra, India

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Not SpecifiedCompensation

Senior (5 to 8 years)Experience Level

Full TimeJob Type

UnknownVisa

Media, AnalyticsIndustries

Requirements

6+ years of hands-on experience in frontend development
Expert in vanilla JavaScript, including closures, prototypes, scopes, memory leaks, and async behavior
Strong debugging skills across browsers and devices, including source maps, breakpoints, performance profiles
Experience developing or maintaining JavaScript SDKs or libraries used by third parties
Deep understanding of browser internals, event loop, network stack, and performance bottlenecks
Familiar with build tools like Webpack, Rollup, Babel, and packaging standards (UMD, ESM, CJS)
Experience with testing tools such as Jest, Mocha, Karma, or Playwright
Comfort with tools like Chrome DevTools, Lighthouse, and Webpack Bundle Analyzer
Nice-to-Have Skills
Familiarity with BrightScript, Roku, or CTV platforms
Prior experience building instrumentation or analytics libraries
Exposure to TypeScript, though deep JS knowledge is primary
Understanding of privacy, security, and consent in SDK integrations

Responsibilities

Architect and build robust, reusable SDK components using modern JavaScript (ES6+)
Optimize code for performance, memory usage, and reliability across platforms
Analyze, debug, and resolve complex issues across environments
Write clean, maintainable, and well-tested code with minimal UI footprint
Collaborate with product managers, QA, and backend teams to define and refine SDK features
Work closely with CI/CD and monitoring pipelines for shipping reliable SDKs
Evaluate and integrate with various streaming or analytics platforms (e.g., CTV, mobile apps, web environments)
Contribute to core engineering practices, code reviews, and technical documentation

Skills

Key technologies and capabilities for this role

JavaScriptES6Vanilla JavaScriptClosuresPrototypesScopesMemory LeaksAsyncDebuggingSource MapsPerformance OptimizationCI/CDSDK Development

Questions & Answers

Common questions about this position

What salary can I expect for the Senior JavaScript Developer role?

This information is not specified in the job description.

Is this Senior JavaScript Developer position remote or office-based?

This information is not specified in the job description.

What are the key skills required for the Senior JavaScript Developer role?

Required skills include 6+ years of frontend development experience, expertise in vanilla JavaScript (closures, prototypes, scopes, memory leaks, async behavior), strong debugging skills across browsers and devices, experience with JavaScript SDKs or libraries, deep understanding of browser internals, and familiarity with build tools like Webpack, Rollup, and Babel.

What is the company culture like at Nielsen for this role?

Nielsen features a dynamic team committed to excellence, perseverance, and making an impact together, with a global workforce passionate about powering a better media future through powerful insights.

What makes a strong candidate for the Senior JavaScript Developer position?

A strong candidate has 6+ years of frontend experience, expert-level vanilla JavaScript knowledge including internals like closures and async behavior, proven SDK development experience, strong debugging skills, and familiarity with build and testing tools.

Nielsen

Global measurement and data analytics provider

About Nielsen

Nielsen provides measurement and data analytics services to help businesses understand consumers and markets globally. The company operates through two main divisions: Nielsen Global Media, which offers reliable metrics for the media and advertising industries, and Nielsen Global Connect, which supplies consumer packaged goods manufacturers and retailers with actionable insights about the marketplace. Nielsen combines its proprietary data with other sources to give clients a comprehensive view of current trends and future opportunities. With a presence in over 100 countries, Nielsen aims to support companies in making informed decisions to drive innovation and growth.

Town of Clarkstown, New YorkHeadquarters

1963Year Founded

$45.1MTotal Funding

ACQUISITIONCompany Stage

Data & Analytics, ConsultingIndustries

10,001+Employees

Benefits

Health Insurance

401(k) Retirement Plan

401(k) Company Match

Unlimited Paid Time Off

Risks

Competition from digital-native analytics firms threatens Nielsen's market share.

Privacy regulations may impact Nielsen's data collection capabilities.

Private equity acquisition could lead to strategic shifts misaligned with client needs.

Differentiation

Nielsen offers comprehensive cross-platform measurement solutions, including mobile media markets.

The Diverse Media Equity program elevates diverse-owned media companies' visibility.

Nielsen Impact Score evaluates marketing value of university athletic programs.

Upsides

Acquisition of Telephia enhances Nielsen's mobile media measurement capabilities.

Partnerships with P&G and NMSDC support diverse media representation.

Collaboration with TikTok improves digital audience measurement services.

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