Senior .NET Engineer – Excel ‑in & AWS Services

Senior .NET Engineer – Excel Add‑in & AWS Services

Role

Summary:

Build the .NET Excel plugin and backend Analysis Service with scalable, event-driven components on AWS, integrating secure APIs and governed data delivery. The expectation for this role is a balance of approximately 60% development and 40% production support. A strong support mindset—particularly around diagnosing and resolving live production issues.

• Develop .NET Excel Add‑in: auth, parameter UI, async refresh, robust error handling, and packaging/deployment.
• Build the Analysis Service (Python/.NET/Java as needed) exposing APIs; integrate caching and throttling; manage MCP Server integrations (as specified).
• Operate on AWS: services on ECS Fargate, serverless with Lambda, orchestration/events with Event Bridge, notifications via SNS, storage on S3, compute on EC2.
• Implement observability and RBAC;
  Jenkins CI/CD pipelines; secure secrets;
  Linux ops.

• .NET (VSTO/Office JS or modern Office Add‑ins) for Excel integrations.
• Python for service utilities; API services usage (REST); AWS (S3, EC2, Lambda, ECS Fargate, Event Bridge, SNS).
• JIRA;
  Jenkins;
  Red Hat Linux exposure; 7–10+ years software/data engineering.

Skillset
: .NET Framework, .NET Core, WEB API, AWS, Python

Work Model
:
Hybrid - Needham, MA, USA

Candidate must be legally authorized to work in the United States without the need for employer sponsorship, now or at any time in the future.

Salary Range
: $65,000 – $117,000 annually

Final date to receive applications: 3/19/2026

This position is eligible for Cognizant’s discretionary annual incentive program, based on performance and subject to applicable plans.

Benefits include:

• Medical, Dental, Vision, and Life Insurance
• Paid Holidays and Paid Time Off
• 401(k) plan with contributions
• Long-term and Short-term Disability
• Paid Parental Leave
• Employee Stock Purchase Plan

Disclaimer
:
The salary, other compensation, and benefits information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.