
Senior JavaScript Engineer
1 week ago
Role Overview
We are looking for a Senior JavaScript Engineer with a strong background in frontend technologies and a keen interest in application performance and user experience monitoring. This role focuses on building and enhancing our Real User Monitoring (RUM) solutions, which capture performance, errors, and user interactions across modern web applications.
You will work on developing efficient, low-overhead JavaScript agents that run in the browser and provide deep visibility into how real users experience applications.
Responsibilities
- Design and develop JavaScript-based monitoring agents that capture performance metrics, errors, and user interactions in the browser.
- Work with browser performance APIs (Navigation Timing, Paint Timing, Long Tasks, Performance Observer) to track key metrics.
- Implement support for Core Web Vitals (LCP, FID, CLS, INP) and other industry-standard KPIs.
- Ensure that monitoring agents are lightweight, efficient, and non-intrusive.
- Collaborate with backend/APM teams to correlate frontend traces with backend monitoring data.
- Implement error monitoring, crash detection, and session replay integrations.
- Keep up with latest web performance standards and W3C specifications.
Must-Have Skills
- 3+ years of professional JavaScript/TypeScript development experience.
- Strong expertise in browser APIs and event-driven programming.
- Hands-on experience with performance measurement and optimization in web apps.
- Solid understanding of Core Web Vitals and web performance monitoring.
- Familiarity with cross-browser compatibility and web debugging tools.
- Experience with one or more frontend frameworks (React, Angular, Vue).
- Knowledge of compression techniques (gzip, brotli).
- Exposure to RUM or frontend monitoring tools (New Relic, Datadog RUM, Dynatrace, Sentry, etc.).
Nice-to-Have Skills
- Experience building or contributing to JavaScript SDKs/agents.
- Knowledge of Web Workers, Service Workers, WebSockets.
- Familiarity with Open Telemetry for frontend instrumentation.
- Understanding of privacy and compliance in telemetry (PII masking, GDPR considerations).
- Experience with session replay libraries and customization.
- Prior contributions to observability, analytics, or APM solutions.
-
Senior Staff Engineer, JavaScript- Fullstack
6 days ago
Chennai, Tamil Nadu, India Nagarro Softwares Pvt. Ltd Full time ₹ 20,00,000 - ₹ 25,00,000 per yearSenior Staff Engineer, JavaScript- Fullstack Company Description We're Nagarro. We are a Digital Product Engineering company that is scaling in a big way We build products, services, and experiences that inspire, excite, and delight. We work at scale — across all devices and digital, and our people exist everywhere in the world experts across 39...
-
JavaScript (Frontend) - Senior Developer
1 week ago
Chennai, Tamil Nadu, India Annalect Full time ₹ 15,00,000 - ₹ 25,00,000 per yearOverview:Annalect is currently seeking a senior frontend engineer to join our technology team remotely. In this role, you will build Annalect products which sit atop our Big Data infrastructure and utilize our componentized design system. In 2019 we adopted Web Components to help us build web applications in a modular and reusable way. We're looking for...
-
Javascript Enginner
7 days ago
Chennai, Tamil Nadu, India Vintage Solution Full time ₹ 80,000 - ₹ 15,00,000 per yearRole OverviewWe are looking for a Senior JavaScript Engineer with a strong background in frontend technologies and a keen interest in application performance and user experience monitoring. This role focuses on building and enhancing our Real User Monitoring (RUM) solutions, which capture performance, errors, and user interactions across modern web...
-
Senior Javascript Developer
2 weeks ago
Chennai, Tamil Nadu, India KNOW Full time ₹ 20,00,000 - ₹ 25,00,000 per yearDetails about the jobYou will work very closely with the Head of Engineering and the CEO directlyOwn major parts of our tech stack, primarily built on JavascriptThis job is based in Chennai (NOT Remote) . But we have a lot of flexibility for when life intervenesWe are only a 40 person company (by choice) - so you will get amazing ownershipBuild cutting-edge...
-
Chennai, Tamil Nadu, India NielsenIQ Full time ₹ 8,00,000 - ₹ 12,00,000 per yearJob Description Senior Engineer- QA Test Automation, Chennai As a Senior QA Automation Engineer role in the field of Quality AssuranceQA Automation Engineer at NIQ Activate, you will play a crucial role in ensuring the stability and quality of our software solutions. You will be responsible for designing, developing, and executing automated...
-
Senior JavaScript AQA Engineer
7 days ago
Chennai, Tamil Nadu, India Luxoft Full time ₹ 20,00,000 - ₹ 25,00,000 per yearProject description Our Client is on a mission to build the IPO process support of the future, and we're looking for passionate collaborators, innovators, advisors, and leaders who can get us there. As a QA Engineer, you will assist Client's digital technology team in coding, testing, debugging and maintaining the architecture of client solutions to support...
-
Javascript Developer
5 days ago
Chennai, Tamil Nadu, India Innova8s Pte Ltd Full time ₹ 9,00,000 - ₹ 12,00,000 per yearCompany DescriptionTransforming agriculture, livestock, and poultry with smart precision technologies, Innova8s Pte Ltd leverages advanced analytics, IoT, and AI/ML. We specialize in creating tailored products and solutions for livestock dairy farms, poultry, and agriculture. We cater to resolving modern-day workforce issues through technology, addressing...
-
Senior Staff Engineer, JavaScript- Fullstack
3 days ago
Chennai, Tamil Nadu, India Nagarro Full time ₹ 20,00,000 - ₹ 25,00,000 per yearCompany DescriptionWe're Nagarro.We are a Digital Product Engineering company that is scaling in a big way We build products, services, and experiences that inspire, excite, and delight. We work at scale — across all devices and digital, and our people exist everywhere in the world experts across 39 countries, to be exact). Our work culture is dynamic and...
-
Javascript Developer
6 days ago
Chennai, Tamil Nadu, India Alp Consulting Ltd. Full time ₹ 12,00,000 - ₹ 36,00,000 per yearShould Have more than 6+ years of Experience and Relavent should be 4 + yearsTechnical Proficiency: Strong expertise in JavaScript, , and relevant frameworks/libraries.Database Knowledge: Experience with database systems (e.g., MongoDB, PostgreSQL, MySQL).API Design: Understanding of RESTful API principles and design best practices.Problem-Solving: ...
-
Senior JavaScript Developer
4 days ago
Chennai, Tamil Nadu, India Careernet Full time ₹ 15,00,000 - ₹ 25,00,000 per yearKey Skills: JavaScript, API, Java.Roles & Responsibilities:Design and develop RESTful APIs using .NET Core.Build high-performance APIs utilizing AWS services.Integrate APIs with SQL databases and maintain API documentation.Develop and maintain unit tests for APIs and troubleshoot API issues.Monitor API performance and optimize as necessary.Collaborate with...