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

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

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 EventBridge, 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, EventBridge, 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

Application Deadline: 3/19/2026

Compensation & Benefits: 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.

Cognizant is one of the world's leading professional services companies, transforming clients' business, operating, and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build, and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant (a member of the NASDAQ-100 and one of Forbes World's Best Employers 2025) is consistently listed among the most admired companies in the world.

Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, provincial or local laws.

If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email CareersNA2@cognizant.com with your request and contact information.

Language requirements vary depending on roles, but we ask that all candidates have basic English proficiency for company-wide communications purposes. For roles based in Quebec, professional English proficiency is required, as you'll deliver services to and collaborate with stakeholders outside the province who may not speak French.