Senior .NET Lead Engineer - Payment Systems

Sr. Software Engineer

About Us 

Zelis is modernizing the healthcare financial experience in the United States (U.S.) across payers, providers, and healthcare consumers. We serve more than 750 payers, including the top five national health plans, regional health plans, TPAs and millions of healthcare providers and consumers across our platform of solutions. Zelis sees across the system to identify, optimize, and solve problems holistically with technology built by healthcare experts – driving real, measurable results for clients.

Why We Do What We Do 

In the U.S., consumers, payers, and providers face significant challenges throughout the healthcare financial journey. Zelis helps streamline the process by offering solutions that improve transparency, efficiency, and communication among all parties involved. By addressing the obstacles that patients face in accessing care, navigating the intricacies of insurance claims, and the logistical challenges healthcare providers encounter with processing payments, Zelis aims to create a more seamless and effective healthcare financial system.

Zelis India plays a crucial role in this mission by supporting various initiatives that enhance the healthcare financial experience. The local team contributes to the development and implementation of innovative solutions, ensuring that technology and processes are optimized for efficiency and effectiveness. Beyond operational expertise, Zelis India cultivates a collaborative work culture, leadership development, and global exposure, creating a dynamic environment for professional growth. With hybrid work flexibility, comprehensive healthcare benefits, financial wellness programs, and cultural celebrations, we foster a holistic workplace experience. Additionally, the team plays a vital role in maintaining high standards of service delivery and contributes to Zelis’ award-winning culture. 

Position Overview

We are seeking a .NET Lead – Payments to drive the design, development, and delivery of mission-critical payment systems. This role combines hands-on technical leadership, architectural ownership, and team mentoring, with a strong focus on secure, scalable, and compliant payment solutions.
You will work closely with product, architecture, compliance, QA, and DevOps teams to build resilient payment services that operate at scale.

Key Responsibilities
Technical Leadership

Lead the end-to-end development of payment processing systems using the .NET stack
Own system architecture and technical design for payment services and APIs
Ensure high availability, fault tolerance, and performance for transaction-heavy systems
Drive adoption of best practices (SOLID, clean architecture, domain-driven design)

Payments & Domain Ownership

Design and implement payment workflows, settlements, reconciliations, and exception handling
Handle high-volume, low-latency transaction processing
Ensure idempotency, retries, and transactional consistency
Collaborate with business teams on payments rules, validations, and edge cases

Security & Compliance

Ensure compliance with PCI-DSS, HIPAA, and internal security standards
Implement secure authentication and authorization (OAuth2, JWT, role-based access)
Partner with security teams on audits, vulnerability remediation, and data protection

Mentorship & Collaboration

Lead and mentor a team of senior and mid-level engineers
Conduct code reviews and enforce coding standards
Participate in sprint planning, estimation, and delivery commitments
Collaborate cross-functionally with Product, QA, SRE, and Compliance


Required Technical Skills
Core Technologies

Strong expertise in C#, .NET Core / .NET 6+
ASP.NET Core Web APIs & Microservices
RESTful services and event-driven architectures

Payments & Data

Strong SQL Server experience (complex queries, performance tuning)
Experience with financial transactions and data consistency
Knowledge of reconciliation and reporting systems

Cloud & DevOps

Azure ecosystem (App Services, Functions, Service Bus, Storage, Key Vault)
CI/CD pipelines (Azure DevOps or GitHub Actions)
Experience with Docker; Kubernetes is a plus

Architecture & Patterns

Microservices architecture
Domain-Driven Design (DDD)
Messaging & eventing (Service Bus, Kafka, or equivalent)
Caching strategies (Redis)

Commitment to Diversity, Equity, Inclusion, and Belonging

At Zelis, we champion diversity, equity, inclusion, and belonging in all aspects of our operations. We embrace the power of diversity and create an environment where people can bring their authentic and best selves to work. We know that a sense of belonging is key not only to your success at Zelis, but also to your ability to bring your best each day.

Equal Employment Opportunity

Zelis is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

Accessibility Support

We are dedicated to ensuring our application process is accessible to all candidates. If you are a qualified individual with a disability and require reasonable accommodation with any part of the application and/or interview process, please email talentacquisition@zelis.com.

Experience Level

Senior Level