Full - Stack C# Developer - Senior

Location: Los Angeles, New York City, Hoboken, San Francisco, San Jose, Seattle, Boston, Chicago, St. Louis, Philadelphia, Dallas, Houston, Irvine, San Diego, Portland, Denver, Minneapolis, Nashville, Phoenix, Pittsburgh, McLean, Atlanta, Charlotte, Detroit, Columbus, Cleveland, Akron, Cincinnati, Miami

At EY, we’re all in to shape your future with confidence.

We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go. Join EY and help to build a better working world.

Technology – Digital Engineering – Full Stack Engineer (Senior)

Whole industries have been disrupted and transformed in recent years by rapidly evolving digital technologies. At EY, we help clients understand, architect, select, and build large‑scale modern technology solutions that power their businesses across web, mobile, cloud platforms, physical environments, and intelligent systems. Our teams span digital strategy, architecture, engineering, design, operations, and applied AI across a wide range of industries.

Are you ready to help build the future with some of the strongest engineering teams in the world. Join us.

Even if you do not check every box below, apply anyway. EY is a place for career growth and everyone’s starting point is different. We would love to hear your story.

The opportunity

As a Senior Full Stack Software Engineer , you will independently develop, test, and maintain high‑quality software solutions across the technology stack. You will work closely with multidisciplinary teams to deliver scalable, secure, and production‑ready applications that are increasingly shaped by intelligent, data‑driven capabilities.

In this role, engineers are expected to approach problem‑solving with a modern mindset, considering how automation, AI‑assisted workflows, and intelligent features can improve system design, developer productivity, and user experience. You will help shape solutions where AI is treated as a core design consideration rather than an afterthought, while maintaining strong software engineering fundamentals.

The role values adaptability across programming languages and platforms, comfort working across frontend and backend systems, and the ability to apply sound engineering judgment in evolving technical landscapes. You will take ownership of your work, contribute to system design decisions, and support solutions from inception through launch and ongoing evolution.

At EY, we partner with the world’s leading organizations to adopt emerging technologies responsibly and effectively. We believe in transforming how companies operate by asking better questions, applying engineering rigor, and delivering trusted, intelligent solutions that scale.

Your Key Responsibilities

As a Senior in Application Design and Development, you will lead the effective management and delivery of processes, solutions, and projects, ensuring a strong focus on quality and risk management. This role presents exciting challenges and opportunities for growth, allowing you to apply your expertise in guiding others and recommending quality solutions. You will engage regularly with external clients, actively participating in working sessions and leading workstreams from planning through execution and closure. Travel may be required as needed by external clients.

• Develop solutions to complex problems, recommending changes to policies and establishing procedures that impact your work area.
• Exercise judgment in selecting methods, techniques, and evaluation criteria for obtaining results.
• Provide direction and feedback to team members, ensuring successful task completion.

Skills And Attributes For Success

To thrive in this role, you will need a blend of technical and business skills that will make a significant impact. Your ability to build and manage relationships, communicate effectively, and lead teams will be essential.

• Independently design, develop, test, and deploy end‑to‑end applications with a focus on scalability, security, and reliability
• Build and maintain backend services and APIs using modern backend programming languages such as Python, Java, C#, or JavaScript or TypeScript, across technology ecosystems including Node.js, Spring, and .NET
• Implement new features and enhancements across frontend and backend systems while optimizing performance
• Contribute to building and shipping intelligent application features, including integrations with large language models, predictive capabilities, and agent‑driven workflows
• Collaborate with cross‑functional teams to refine requirements and translate them into technical designs and functional code
• Contribute to system and application architecture, including data models, integrations, security, and cloud deployment considerations
• Participate fully in agile delivery, including sprint planning, refinement, reviews, demos, and retrospectives
• Conduct code reviews and help establish high standards for code quality, testing, and maintainability
• Create and maintain technical documentation aligned with best practices across the software development lifecycle
• Identify, troubleshoot, and resolve issues across development and production environments
• Mentor junior engineers and contribute to a collaborative, high‑performing engineering culture
• See projects through from inception to launch and continued evolution in partnership with EY and client leadership

To qualify for the role, you must have

• Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent experience
• 3 or more years of professional software engineering experience
• Proficiency in at least one modern backend programming language, such as Python, Java, C#, or JavaScript or TypeScript
• Experience with full stack development and one or more backend frameworks or technology ecosystems
• Working knowledge of modern frontend frameworks such as React, Angular, or equivalent
• Experience designing and implementing RESTful APIs
• Strong database skills across relational and non‑relational data stores, including query optimization
• Experience using Git‑based version control and collaborative development workflows
• Comfort working in local and cloud environments, including command‑line tooling and system configuration
• Ability to independently identify, debug, and resolve issues
• Strong written and verbal communication skills
• Willingness and ability to travel based on client needs, up to approximately 25 percent

Ideally, you’ll also have

• Experience building and operating cloud‑native or microservices‑based applications, preferably on Azure or similar cloud platforms
• Hands‑on exposure to cloud services for compute, data, identity, and monitoring
• Familiarity with service‑oriented, API‑driven, and distributed system architectures, including event‑driven patterns
• Experience with containerization and orchestration technologies such as Docker and Kubernetes
• Experience designing or integrating intelligent application capabilities, including large language models, embeddings, or retrieval‑based approaches
• Comfort designing systems where AI‑driven capabilities are considered early, with an understanding of when AI is appropriate versus traditional deterministic logic
• Familiarity with AI‑assisted development workflows, agent‑based patterns, or orchestration approaches
• Understanding of security, identity, and access management in cloud environments
• Familiarity with CI/CD pipelines, DevOps practices, and production observability
• Experience supporting applications post‑launch in enterprise or regulated environments

What We Look For

We value engineers who are adaptable, curious, and grounded in strong software engineering principles. Our clients operate across diverse technology stacks, so we prioritize individuals who can transfer their skills across languages and platforms while delivering intelligent, high‑quality solutions. Different perspectives strengthen our teams and help us deliver better outcomes for our clients.

What We Offer You

At EY, we’ll develop you with future-focused skills and equip you with world-class experiences. We’ll empower you in a flexible environment, and fuel you and your extraordinary talents in a diverse and inclusive culture of globally connected teams. Learn more.

• We offer a comprehensive compensation and benefits package where you’ll be rewarded based on your performance and recognized for the value you bring to the business. The base salary range for this job in all geographic locations in the US is $102,500 to $187,900. The base salary range for New York City Metro Area, Washington State and California (excluding Sacramento) is $122,900 to $213,400. Individual salaries within those ranges are determined through a wide variety of factors including but not limited to education, experience, knowledge, skills and geography. In addition, our Total Rewards package includes medical and dental coverage, pension and 401(k) plans, and a wide range of paid time off options.
• Join us in our team-led and leader-enabled hybrid model. Our expectation is for most people in external, client serving roles to work together in person 40-60% of the time over the course of an engagement, project or year.
• Under our flexible vacation policy, you’ll decide how much vacation time you need based on your own personal circumstances. You’ll also be granted time off for designated EY Paid Holidays, Winter/Summer breaks, Personal/Family Care, and other leaves of absence when needed to support your physical, financial, and emotional well-being.

Are you ready to shape your future with confidence? Apply today.

EY accepts applications for this position on an on-going basis.

For those living in California, please click here for additional information.

EY focuses on high-ethical standards and integrity among its employees and expects all candidates to demonstrate these qualities.

EY | Building a better working world

EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets.

Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.

EY teams work across a full spectrum of services in assurance, consulting, tax, strategy and transactions. Fueled by sector insights, a globally connected, multi-disciplinary network and diverse ecosystem partners, EY teams can provide services in more than 150 countries and territories.

EY provides equal employment opportunities to applicants and employees without regard to race, color, religion, age, sex, sexual orientation, gender identity/expression, pregnancy, genetic information, national origin, protected veteran status, disability status, or any other legally protected basis, including arrest and conviction records, in accordance with applicable law.

EY is committed to providing reasonable accommodation to qualified individuals with disabilities including veterans with disabilities. If you have a disability and either need assistance applying online or need to request an accommodation during any part of the application process, please call 1-800-EY-HELP3, select Option 2 for candidate related inquiries, then select Option 1 for candidate queries and finally select Option 2 for candidates with an inquiry which will route you to EY’s Talent Shared Services Team (TSS) or email the TSS at ***email_hidden***.