Software Engineer III: Backend C#

Jack Henry, provides advanced bill payment and money transfer solutions to banks and credit unions. We offer modernized smart technology, including AI driven, security, cloud-based software, and fraud monitor, to deliver engaging payment solutions to customers. Our solutions help financial institutions to meet the payment expectations of today and the payment innovation needs of tomorrow. Payments become smarter, engaging, and predictive with Payrailz.

We are looking for a software engineer who combines strong backend development expertise with a passion for cloud technologies, distributed systems, and modern engineering practices. The ideal candidate is comfortable designing scalable event-driven solutions, solving complex technical problems, and taking ownership of systems that require both innovation and operational excellence.

We are seeking an experienced Software Engineer - C#/.NET Backend Developer to join our Payment Processing team in a full-time, fully remote capacity. In this role, you will design, develop, and support high-performance, cloud-native backend services, APIs, and large-scale batch processing solutions that power critical payment transactions.

You will play a key role in modernizing and scaling our payment platform using AWS cloud technologies, event-driven architecture, distributed systems, and AI-assisted development practices, while stabilizing and scaling existing payment processing platform.

This position may be worked remotely within the United States, with the exception of California.

This position is ineligible for immigration sponsorship and support. Please do not apply if at any time you will need immigration support now or in the future (i.e., H-1B, PERM).

All positions, regardless of location, may require an onsite interview or in-person onboarding requirement to verify your identity.

What you’ll be responsible for:

• Design, develop, and maintain scalable backend services and APIs using C#/.NET.
• Build and support event-driven applications utilizing AWS services such as EventBridge, Lambda, SQS, SNS, Step Functions, ECS, and related cloud-native technologies.
• Design and implement high-volume batch processing systems capable of handling large-scale payment workloads efficiently and reliably.
• Develop secure and resilient payment processing solutions that integrate with banking networks, payment gateways, and third-party service providers.
• Participate in architecture discussions and contribute to strategic modernization initiatives.
• Define and promote engineering standards, best practices, and design patterns for backend development.
• Collaborate closely with Product Owners, QA, Operations, and other engineering teams throughout the software development lifecycle.
• Perform code reviews and mentor engineers on backend development, cloud architecture, and software engineering best practices.
• Leverage AI tools and modern engineering practices to improve development productivity, software quality, and operational efficiency.
• Create and maintain technical documentation, test plans, and operational support guides.
• Participate in Agile ceremonies including sprint planning, daily stand-ups, backlog refinement, and retrospectives.
• Provide production support, troubleshooting, root cause analysis, and participate in on-call rotations for critical business systems.
• May perform other job duties as assigned.

What you’ll need to have:

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or related technical field.
• 4 years of software development experience, including:

• 2+ years developing enterprise applications using C# and .NET.
• 2+ years designing and supporting RESTful APIs and backend services.
• Experience building large-scale batch processing applications.

• Strong experience designing and implementing event-driven architectures and asynchronous processing patterns.

• Hands-on experience with AWS cloud services, including EventBridge, Lambda, SQS, SNS, ECS, CloudWatch, and related technologies.

• Proven experience integrating with payment processors, banking systems, ACH networks, or payment gateways.

• Experience working with MySQL and SQL Server, including:

• Database schema design.

• Query optimization.

• Stored procedures and functions.

• Performance tuning.

• Experience leveraging AI tools and technologies to improve software development, testing, troubleshooting, and operational efficiency.

• Excellent analytical, troubleshooting, and problem-solving skills.

• Strong verbal and written communication skills.

What would be nice for you to have:

• Experience with Microsoft Orleans and virtual actor-based distributed systems.
• Experience building microservices architectures.
• Familiarity with Terraform, Infrastructure as Code (IaC), or cloud automation tools.
• Experience implementing monitoring and observability solutions using CloudWatch, OpenTelemetry, Grafana, Datadog, or similar platforms.
• Experience working in regulated financial services or payment processing environments.
• Knowledge of CI/CD pipelines, GitHub Actions, Azure DevOps, or similar deployment platforms.
• Familiarity with security best practices, authentication, authorization, and secure software development principles.
• Experience supporting high-availability systems requiring 24x7 operational support.

If you got this far, we hope you're feeling excited about this opportunity. Even if you don't feel you meet every single requirement on this posting, we still encourage you to apply. We’re looking for passionate, driven individuals who align with our mission and can bring unique perspectives to our team.

Why Jack Henry?

At Jack Henry, we live by the motto: “Do the right thing, do whatever it takes, and have fun.” It’s more than a tagline, it’s the foundation of our culture. We recognize that our associates are the key to our success, and we’re deeply committed to their wellbeing. That’s why we offer comprehensive benefits designed to support your physical, mental, and financial health so you can thrive both personally and professionally.

We’re also leading the way in technology modernization, helping financial institutions evolve with speed, security, and flexibility. Our strategy focuses on delivering secure data access, mitigating fraud, and enabling seamless integration. Empowering our teams to build innovative solutions that meet the evolving needs of accountholders.

Culture of Commitment

Ask our associates why they love Jack Henry, and many will tell you it is because our culture is exceptional. We do great things together. Our culture empowers us to rise to challenges, seek new opportunities, and support one another through change. It’s this shared commitment that drives our success. We’re proud to foster an environment where inclusion, sustainability, and community impact are more than values, they’re how we operate. Visit our Corporate Sustainability site to learn more about our culture and commitment to our people, customers, community, environment, and shareholders.

Equal Employment Opportunity

At Jack Henry, we know we are better together. We value, respect, and protect the uniqueness each of us brings. Innovation flourishes by including all voices and makes our business - and our society - stronger. Jack Henry is an equal opportunity employer and we are committed to providing equal opportunity in all of our employment practices, including selection, hiring, performance management, promotion, transfer, compensation, benefits, education, training, social, and recreational activities to all persons regardless of race, religious creed, color, national origin, ancestry, physical disability, mental disability, genetic information, pregnancy, marital status, sex, gender, gender identity, gender expression, age, sexual orientation, and military and veteran status, or any other protected status protected by local, state or federal law.

No one will be subject to, and Jack Henry prohibits, any form of discipline, reprisal, intimidation, or retaliation for good faith reports or complaints of discrimination of any kind, pursuing any discrimination claim, or cooperating in related investigations.

Requests for full corporate job descriptions may be requested through the interview process at any time.