Web Full Stack Developer

Fiserv

Full-Stack Web Developer building high-value applications for global support operations at Fiserv. Utilizing modern tech stack including React, TypeScript, C# and ASP.NET Core.

Posted 6/10/2026full-timeHagerstown • Maryland • 🇺🇸 United StatesMid-LevelSenior💰 $90,000 - $127,000 per yearWebsite

Tech Stack

Tools & technologies

ASP.NETJavaScriptMicroservices.NETReactSQLTypeScript

About the role

Key responsibilities & impact

Design, develop, and maintain responsive web applications using React and ASP.NET Core to support modern Single Page Application (SPA) experiences
Build, evolve, and support robust RESTful APIs and backend microservices in C# with a strong emphasis on maintainability, scalability, and clean architecture
Translate complex business needs into well-structured technical solutions, including UI workflows, API contracts, and performant data models
Develop, optimize, and maintain SQL Server database schemas, T-SQL queries, stored procedures, and advanced indexing strategies to support high-volume data use cases
Implement enterprise-grade security practices, including secure coding patterns, robust authentication/authorization protocols, and least-privilege access controls
Create reusable, tested front-end components and backend services using modular design patterns that facilitate long-term codebase health
Collaborate closely with product owners, technical analysts, and cross-functional support teams to reliably deliver features from concept and build to release and support
Participate actively in code reviews, system troubleshooting, performance tuning, and production monitoring to ensure top-tier software quality
Contribute to essential technical documentation, including design notes, operational runbooks, and supportability guides to enhance team velocity

Requirements

What you’ll need

Bachelor’s degree in Computer Science, Management Information Systems (MIS), or equivalent practical/professional work experience
5+ years of professional hands-on experience designing, building, delivering, and supporting full-stack web applications
Strong backend proficiency in C# and modern .NET development (ASP.NET Core)
Strong frontend proficiency in React utilizing modern patterns, including functional components, custom hooks, and component design
Production experience using TypeScript and modern JavaScript (ES6+) alongside HTML5 and CSS3 with an awareness of responsive layouts and accessibility
Solid database expertise with SQL Server and T-SQL, including data modeling, advanced querying, and schema optimization
Proven experience building, securing, and consuming REST APIs for client-device and web-client interactions
Familiarity with modern software development practices, including Git-based version control (advanced branching and merging), CI/CD concepts, automated unit/integration testing, and log-based production troubleshooting
Excellent written and verbal communication skills with the ability to work cross-functionally and translate business requirements into software solutions

Benefits

Comp & perks

Fuel Your Life program to support your physical, financial, social, and emotional well-being
Paid holidays and generous time away policies
No-cost mental health support through Employee Assistance Programs
Living Proof program to recognize your peers’ extra effort with points redeemable for rewards
Eight Employee Resource Groups to foster a collaborative culture and expand your network
Unparalleled professional growth with training, development, and internal mobility opportunities
Medical, dental, vision, life, and disability insurance options available from day one
Retirement planning and discounted shares with the Employee Stock Purchase Plan
Tuition assistance and reimbursement program
Paid parental, caregiver, and military leave

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

ReactASP.NET CoreC#RESTful APIsSQL ServerT-SQLTypeScriptJavaScript (ES6+)HTML5CSS3

Soft Skills

communicationcollaborationproblem-solvingtechnical documentationcode reviewsperformance tuningtroubleshootingcross-functional teamworktranslating business requirementsdesign patterns

Certifications

Bachelor’s degree in Computer ScienceBachelor’s degree in Management Information Systems