Applications Development (Level D/E)
Location: Gurgaon / Noida
Work Model: Hybrid — at least three days a week in the office
What can you expect?
As a Senior Principal Engineer – Applications Development (Level E) at Mercer, you will serve as a senior technical leader responsible for shaping engineering strategy, driving enterprise-scale architecture decisions, and leading the design, development, testing, and modernization of highly scalable, resilient, and secure software platforms. This role requires deep hands-on expertise, robust architectural judgment, and the ability to influence engineering direction across multiple teams, products, and platforms.
We will count on you to:
Provide technical leadership and architectural direction across multiple applications, products, or engineering streams.
Design and deliver scalable, resilient, secure, and maintainable enterprise applications aligned with domain and enterprise architecture standards.
Lead the engineering lifecycle from solution design through development, testing, deployment, observability, and production optimization.




Drive adoption of modern engineering practices , including domain-driven design, event-driven architecture, API-first design, microservices, cloud-native engineering, and platform automation.
Define and implement comprehensive quality engineering strategies , including unit, integration, contract, end-to-end, performance, security, and resiliency testing.
Establish and evolve engineering standards, reusable frameworks, reference implementations, and best practices across teams.
Lead the development of high-quality automated testing frameworks and quality gates to improve release confidence and reduce regression risk.
Partner with Dev Ops and platform engineering teams to strengthen CI/CD pipelines, Infrastructure as Code, release governance, and environment automation.
Embed security-by-design principles into engineering practices, including proactive remediation of SAST, DAST, dependency, s

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