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Software Development Engineer III, Extensions - Frontend at Weekday AI. This role is for one of the Weekday's clients. Salary range: Rs 4000000 - Rs 8000000 (ie INR 40-80 LPA). Min Experience: 7 years. Location: Remote (India). JobType: full-time. As an SDE III focused on Browser Extensions, you will take ownership of building and scaling high-quality, performance-driven web extension experiences used in production at scale. This role is designed for a senior engineer who can independently drive complex initiatives end to end—from technical design to reliable delivery—while influencing product direction and engineering standards. You will work closely with cross-functional teams to shape the product roadmap, design optimal solutions, and ensure that browser-based experiences are robust, secure, and performant across environments. In addition to hands-on development, this role carries strong expectations around technical leadership, mentorship, and continuous improvement of engineering practices.. Key Responsibilities. Own and deliver well-scoped projects independently, ensuring high-quality outcomes with minimal errors and on-time execution. Design and implement scalable, maintainable solutions for new features and modules in collaboration with other engineers. Contribute meaningfully to the product roadmap through technical insights and architectural recommendations. Establish and promote best practices in development, performance optimization, testing, and code quality. Collaborate across teams to define clean interfaces, simplify integrations, and build reusable components and services. Provide technical mentorship to engineers, offering guidance on design decisions, implementation strategies, and problem-solving. Drive engineering excellence through design documentation, code reviews, testing strategies, observability, and safe rollout processes. Diagnose and resolve production issues across the stack, participate in operational support, and proactively reduce system reliability risks. Influence architecture and long-term technical direction through strong ownership and leadership. What Makes You a Great Fit. 7+ years of hands-on experience building and shipping production-grade web applications. Strong expertise in frontend technologies including JavaScript, TypeScript, DOM rendering and manipulation, and frameworks such as React. Solid programming experience in at least one backend language such as Node.js or Python, with strong computer science fundamentals. Proven experience working on high-scale, customer-facing production systems. Strong analytical thinking and problem-solving skills with a structured approach to complex challenges. Deep understanding of design patterns and their practical application in real-world systems. A strong focus on writing highly optimized, performant, and maintainable production-quality code. Passion for technology and staying current with modern engineering trends and tools. Experience building or maintaining cross-browser web extensions is a strong advantage. Exposure to AI/ML systems, particularly on-device or client-side models, is a plus. Company Location: India.