Senior .NET API Developer
Confirmed on the employer's own hiring board on Nov 10, 2026. First seen by Alion on Nov 10, 2026. Cognizant scores A on the Alion truth index.
Senior .NET API Developer (Payments & Microservices)
About the Role
As a Senior .NET API Developer, you will make an impact by designing, developing, and supporting scalable, secure, and high-performance APIs and microservices that power critical payment and financial services applications. You will work closely with cross-functional teams to deliver enterprise-grade solutions using modern .NET technologies while contributing to architecture, API governance, and Agile delivery practices.
In This Role, You Will
- Design and develop scalable, secure, and high-performance RESTful Web APIs and microservices using C#, .NET/.NET Core, ASP.NET Core Web API, and ASP.NET MVC Core following API-first design principles and industry best practices.
- Own the end-to-end API lifecycle including API design, development, integration, testing, deployment, versioning, maintenance, and production support.
- Design and implement authentication and authorization solutions using OAuth 2.0, OpenID Connect (OIDC), JWT bearer tokens, claims-based authorization, RBAC, and enterprise identity providers such as Microsoft Entra ID.
- Develop and maintain microservices-based applications with a focus on resiliency, security, performance, observability, and scalability.
- Implement API management capabilities using Apigee, including gateway integration, traffic management, security policies, and API governance.
- Design, develop, and optimize database solutions, SQL queries, and stored procedures to support high-volume transactional systems.
- Participating in Agile ceremonies including sprint planning, backlog refinement, design reviews, code reviews, and retrospectives.
- Utilize Azure DevOps and Jira for source control, CI/CD, work item management, and release planning.
- Collaborate with architects, product owners, and business stakeholders to deliver innovative and reliable solutions supporting cards and payments platforms.
Required Qualifications
- 8+ years of experience developing enterprise applications using C#, .NET/.NET Core, ASP.NET Core Web API, and ASP.NET MVC Core.
- Strong expertise in REST API development, API-first design methodologies, and microservices architecture.
- Hands-on experience with API management platforms, preferably Apigee.
- Experience implementing secure authentication and authorization using OAuth 2.0, OpenID Connect, JWT, and enterprise identity management solutions.
- Strong SQL and relational database experience, including data modeling, query optimization, and stored procedure development.
- Experience working in Agile/Scrum environments utilizing Azure DevOps and Jira.
- Proven experience developing solutions within the cards and payments domain.
Preferred Qualifications
- Experience designing distributed systems and cloud-native applications.
- Knowledge of payment card processing, authorization, settlement, dispute, and chargeback workflows.
- Experience implementing CI/CD pipelines and DevOps best practices.
- Experience mentoring developers and contributing to architecture and technical design decisions.
- Experience working within highly regulated financial services environments.
Work Model
We believe hybrid work is the way forward as we strive to provide flexibility wherever possible. Based on this role's business requirements, this is a hybrid position requiring associates to work onsite 2-3 days per week in Halifax, Nova Scotia (NS). The remaining days may be worked remotely, subject to project, client, and business requirements.
Regardless of your working arrangement, we are here to support a healthy work-life balance through our various wellbeing programs. The working arrangements for this role are accurate as of the date of posting and may change based on project, client, and business needs. Rest assured, we will always be clear about role expectations.
Salary and Other Compensation
The annual salary for this position is CAD $61,500 - $104,500, depending on experience and other qualifications of the successful candidate.
This position is also eligible for Cognizant's discretionary annual incentive program, based on performance and subject to the terms of Cognizant's applicable plans.
The salary range identified above is intended to provide potential candidates with a general understanding of the compensation associated with the position. Final compensation decisions are based on a variety of factors including experience, qualifications, skills, education, and geographic location.
Benefits
Cognizant offers a comprehensive and competitive benefits package designed to support the health, wellbeing, and financial security of our associates, including:
- Comprehensive Medical, Dental, and Vision Coverage
- Life Insurance and Disability Coverage
- Employee Assistance Program (EAP)
- Registered Retirement Savings Plan (RRSP) and applicable company programs
- Paid Vacation and Personal Days
- Paid Statutory Holidays
- Employee Wellness Programs
- Employee Resource Groups and Inclusion Networks
- Learning and Development Programs
- Certification and Professional Development Support
- Employee Referral Program