Sr. .NET Full Stack Developer-Software Engineer III

About the role

As a Senior Full Stack .NET Engineer within Deloitte’s Project Delivery Talent Model, you will design, develop, and maintain mission-critical web applications and scalable APIs in a collaborative, onsite client-service environment with minimal travel. The role bridges robust backend architecture and responsive frontend interfaces to deliver high-performance software solutions for the financial and insurance sectors.

Responsibilities

• Full-lifecycle development: design, implement, and maintain scalable, fault-tolerant web applications using C#, .NET (Core / .NET 8), and modern web frameworks tailored for high-volume financial transactions.
• Frontend engineering: develop responsive, accessible, and dynamic user interfaces using HTML5, CSS3, and JavaScript/TypeScript alongside leading component-based frameworks (e.g., Angular, React, or Vue.js).
• API & architecture design: architect RESTful APIs and microservices, writing highly optimized, clean, and testable code that strictly adheres to SOLID principles and standard design patterns.
• Database integration: architect efficient database schemas, write advanced T-SQL queries, and utilize Object-Relational Mappers (e.g., Entity Framework Core) within Microsoft SQL Server to ensure ACID compliance across distributed systems.
• Performance tuning: proactively optimize system performance, debug complex backend configurations, and resolve latency bottlenecks to meet strict Service Level Agreements (SLAs).
• CI/CD & DevOps collaboration: support automated deployment pipelines by utilizing version control (Git) and building automation tools (e.g., Azure DevOps, GitHub Actions) with a focus on secure, compliant deployment practices.
• Agile collaboration & quality assurance: participate actively in Agile ceremonies (daily stand-ups, sprint planning) and elevate team code quality through rigorous peer code reviews and architectural discussions.
• Collaborate with cross-functional teams, participate in code reviews, and provide constructive feedback to uphold engineering standards and maintainable code.
• Partner closely with product managers and interoperability leads to ensure technical solutions align with healthcare needs and integration expectations.
• Communicate regularly with Engagement Managers, project team members, and representatives from various functional and technical teams, escalating matters that require additional attention.
• Independently and collaboratively lead client engagement workstreams focused on process improvement, optimization, and transformation, including implementing leading-practice workflows and driving operational outcomes.

Skills

• Ability to work independently and collaborate as part of a team.
• Effective written and verbal communication skills.
• Meticulous attention to detail and quality of work product.
• Ability to build and sustain professional relationships.
• Ability to lead projects or workstreams.
• Ability to manage and prioritize multiple tasks in a fast-paced and dynamic environment.
• Strong interpersonal skills and professional demeanor.
• Ability to meet deadlines.
• Ability to provide clear guidance to others.

About the team

AI & Engineering leverages cutting-edge engineering capabilities to build, deploy, and operate integrated sector solutions in software, data, AI, network, and hybrid cloud infrastructure. These solutions transform mission-critical operations and enable clients to stay ahead with the latest advancements by modernizing technology and data platforms. Delivery models are tailored to meet each client’s unique requirements.

Qualifications

• 6+ years of experience in .Net Full Stack Development.
• 6+ years of professional software engineering experience, including mandatory experience developing enterprise-grade applications in highly regulated industries (e.g., Financial Services, Insurance, or Banking).
• Demonstrated expertise in secure software development lifecycles (SSDLC), mitigating OWASP Top 10 vulnerabilities, and handling sensitive data (PII/NPI) with rigorous encryption and compliance standards.
• Deep technical proficiency in C# and the .NET ecosystem (.NET Core / .NET 5+), with a strong command of Object-Oriented Programming (OOP) and asynchronous programming patterns.
• Hands-on experience developing Single Page Applications (SPAs) using modern JavaScript/TypeScript frameworks.
• Expert-level knowledge of relational database design (Microsoft SQL Server), data access technologies (Entity Framework, ADO.NET), and ensuring data integrity across complex financial workflows.
• Proven track record of writing reliable unit and integration tests using industry-standard frameworks (e.g., xUnit, NUnit, or MSTest) to ensure zero-defect releases for critical systems.
• Bachelor’s degree, preferably in Computer Science, Information Technology, Computer Engineering, or related IT discipline; or equivalent experience.
• Limited immigration sponsorship may be available.
• Ability to travel 10%, on average, based on the work you do and the clients and industries/sectors you serve.

Preferred qualifications

• Domain knowledge: familiarity with specific FSI workflows, such as claim processing, underwriting life cycles, policy administration, or payment gateways.
• Compliance frameworks: working knowledge of industry-specific data privacy frameworks such as PCI-DSS, GLBA, or SOX.
• Cloud architecture: hands-on experience building, deploying, and scaling cloud-native applications in Microsoft Azure (App Services, Azure Functions, Cosmos DB) or AWS.
• Containerization: familiarity with Docker, Kubernetes, or similar container orchestration platforms.

Analytical & decision-making responsibilities

• Analytical ability to manage multiple projects and prioritize tasks into manageable work products.
• Can operate independently or with minimum supervision.
• Excellent written and communication skills.
• Ability to deliver technical demonstrations.