Freelance Mobile Application Developer Jobs in Delaware

Calling all innovators - find your future at Fiserv.

We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv.

Job Title

About your role:

You will design, develop, and maintain software applications across the Issuer Solutions portfolio. You will work with engineering, platform, cloud, security, and delivery teams to define standards, improve software quality, and support scalable execution. Your work will strengthen architecture consistency, software delivery practices, and adoption of artificial intelligence-assisted engineering workflows.

What you'll do:

• Define and evolve engineering standards for code quality, architecture patterns, continuous integration and continuous delivery (CI/CD), and application security across the Issuer Solutions portfolio.

• Conduct solution architecture reviews, code reviews, and design consultations for teams building in Java, Spring Boot, .NET, Angular, Python, and related technologies.

• Create reusable patterns, reference implementations, and technical decision frameworks that improve consistency and support independent team execution.

• Translate enterprise platform, cloud, security, and artificial intelligence center of excellence guidance into actionable engineering practices for delivery teams.

• Champion adoption of artificial intelligence-assisted engineering workflows and developer tools, measuring impact on software quality, efficiency, and delivery throughput.

• Prototype solutions, build internal tools, and contribute to critical-path code to accelerate delivery and resolve complex technical challenges.

• Identify systemic quality issues across the portfolio and implement solutions that improve defect escape rates, lead time, and production outcomes.

• Deliver technical training, mentoring, and knowledge-sharing forums that strengthen architectural thinking, production ownership, and artificial intelligence fluency across engineering teams.

• Responsibilities listed are not intended to be all-inclusive and may be modified as necessary.

Experience you'll need to have:

• 10+ years of experience in software engineering, including designing, developing, and supporting enterprise software applications across modern technology stacks.

• 8+ years of experience with Java, Spring Boot, Microsoft Azure, Amazon Web Services (AWS), or similar enterprise frameworks for microservices, representational state transfer (REST) application programming interfaces (APIs), Java Persistence API (JPA), Hibernate, and messaging-based systems.

• 4+ years of experience building and maintaining CI/CD pipelines and DevOps practices using tools such as GitLab CI, Jenkins, and automated testing frameworks.

• 4+ years of experience working in cloud-native and containerized environments using Kubernetes, OpenShift, Docker, AWS, Azure, Google Cloud Platform (GCP), or similar technologies.

• 4+ years of experience using relational and NoSQL databases in enterprise application environments.

• Experience adopting and scaling artificial intelligence-assisted development tools to improve measurable engineering outcomes across teams.

• Bachelor's degree or higher in computer science, software engineering, information technology, or a related field, or equivalent combination of education, related experience and/or military experience.

Experience that would be great to have:

• Experience influencing engineering quality, architecture direction, and delivery practices across teams without direct reporting authority.

• Experience with application security practices including OAuth 2.0, JSON Web Token (JWT), transport layer security (TLS), secrets management, and vulnerability remediation workflows.

• Experience in financial services or financial technology environments.

• Experience delivering technical presentations, workshops, and written guidance for engineering and leadership audiences.

How you'll work:

This role is on-site Monday through Friday. Fiserv considers in-person collaboration to be an essential part of this role as in-person office experiences help you with your overall onboarding experience and leads to stronger productivity.

Travel:

This role requires regular travel (10%)

Sponsorship:

You must currently possess valid and unrestricted U.S. work authorization to be considered for this role. Individuals with temporary visas including, but not limited to, F-1 (OPT, CPT, STEM), H-1B, H-2, or TN, or any candidate requiring sponsorship, now or in the future, will not be considered for this role.

Benefits at Fiserv:

• 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 including 401k match and discounted shares with the Employee Stock Purchase Plan.

• Tuition assistance and reimbursement program.

• Paid parental and military leave.

Salary Range

These pay ranges apply to employees in New Jersey and New York. Pay ranges for employees in other states may differ.

It is unlawful to discriminate against a prospective employee due to the individual's status as a veteran.

Thank you for considering employment with Fiserv. Please:

• Apply using your legal name
• Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable).

Our commitment to Equal Opportunity:

Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law.

If you have a disability and require a reasonable accommodation in completing a job application or otherwise participating in the overall hiring process, please contactAskHR.US@fiserv.com. Please note our AskHR representatives do not have visibility to your application status. Current associates who require a workplace accommodation should refer to Fiserv's Disability Accommodation Policy for additional information.

Note to agencies:

Fiserv does not accept resume submissions from agencies outside of existing agreements.Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions.

Warning about fake job posts:

Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.