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Mainframe Testing Jobs in Delaware (NOW HIRING)

Monitise

Cyber Risk Controls Officer

Wilmington, DE

$146K - $244K/yr

Support control testing readiness, audit responses, and regulatory examination activities by ... server (distributed, mainframe, cloud) and network infrastructure technology * 5+ years of ...

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Mainframe Testing information

What are some common challenges faced by professionals working in Mainframe Testing?

Professionals in Mainframe Testing often encounter challenges such as understanding legacy code, dealing with limited documentation, and adapting to the evolving integration of mainframe and modern systems. Testers must also effectively validate large volumes of data, ensure compatibility across interconnected applications, and manage tight release deadlines. Collaborating closely with developers, business analysts, and operations teams is essential for clarifying requirements and troubleshooting issues. Successfully overcoming these challenges requires persistence, a willingness to learn, and strong teamwork skills.

What are the key skills and qualifications needed to thrive in the Mainframe Testing position, and why are they important?

To thrive in Mainframe Testing, you need strong analytical abilities, a solid understanding of mainframe environments and programming languages like COBOL, JCL, and experience with testing methodologies. Familiarity with tools such as IBM Mainframe, CA7/Endevor, and mainframe testing frameworks, as well as ISTQB certification, is highly valuable. Attention to detail, strong problem-solving skills, and effective communication are essential soft skills in this role. These competencies help ensure that complex mainframe systems are thoroughly tested, reliable, and meet business requirements.

What is a Mainframe Testing job?

A Mainframe Testing job involves validating and verifying applications running on mainframe systems to ensure they function correctly, efficiently, and securely. Testers perform various types of testing, including functional, integration, regression, and performance testing, using tools like JCL, COBOL, DB2, and CICS. They analyze test results, identify defects, and collaborate with developers to resolve issues. Mainframe testers need knowledge of batch processing, databases, and system interactions to ensure seamless operations. The role is critical in industries like banking, insurance, and healthcare, where mainframes handle high-volume transactions.

What are popular job titles related to Mainframe Testing jobs in Delaware? For Mainframe Testing jobs in Delaware, the most frequently searched job titles are:
What job categories do people searching Mainframe Testing jobs in Delaware look for? The top searched job categories for Mainframe Testing jobs in Delaware are:
Mainframe Testing jobs near you
Infographic showing various Mainframe Testing job openings in Delaware as of July 2026, with employment types broken down into 25% Part Time, and 75% Contract. Highlights an 100% In-person job distribution.
Senior Full Stack Developer - Vice President

Senior Full Stack Developer - Vice President

Citigroup, Inc.

New Castle, DE • On-site

$125K - $188K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 10 days ago

Job description

The Full Stack Developer is a senior-level position responsible for designing, developing, and implementing both frontend and backend application systems and services. This role requires hands-on expertise across the full technology stack, with a strong emphasis on building scalable APIs and modern, responsive user interfaces using React. The overall objective is to deliver high-quality, reusable frameworks and solutions that support complex business requirements.
Responsibilities
  • Partner with multiple management and cross-functional teams to ensure seamless integration of business and technology solutions, while identifying and defining necessary system enhancements.
  • Design, develop, and maintain scalable backend services using Java and Spring frameworks, along with modern frontend applications using React.js.
  • Build intuitive, responsive, and high-performance user interfaces that enhance user experience.
  • Develop and maintain RESTful APIs and microservices architecture.
  • Resolve high-impact problems through in-depth evaluation of complex business and system processes.
  • Ensure application design aligns with enterprise architecture standards and best practices.
  • Establish and enforce coding, testing, debugging, and deployment standards across the full stack.
  • Collaborate closely with UI/UX designers, product owners, and backend teams to deliver cohesive solutions.
  • Contribute to the development of CI/CD pipelines and support DevOps best practices.
  • Provide technical leadership, mentorship, and guidance to mid-level developers and analysts.
  • Assess risk appropriately in all technical decisions, ensuring compliance with regulatory requirements, company policies, and ethical standards.

Required Qualifications
  • Strong proficiency in Java (Spring Boot) and backend service development.
  • Hands-on experience with React.js, modern JavaScript (ES6+), HTML5, and CSS3.
  • Experience building and consuming RESTful APIs and integrating frontend applications with backend services.
  • Working knowledge of state management libraries (e.g., Redux, Context API).
  • Experience with databases: Oracle, SQL, and NoSQL (MongoDB).
  • Familiarity with cloud platforms (OpenShift, Kubernetes) and containerization.
  • Experience with messaging systems such as Kafka and MQ.
  • Strong understanding of software development lifecycle (SDLC) and Agile methodologies.
  • Knowledge of DevOps practices, CI/CD pipelines, and version control systems (e.g., Git).
  • Solid understanding of clean code principles and application design patterns.
  • Ability to work independently in a fast-paced and dynamic environment.
  • Strong analytical, problem-solving, and communication skills.

Preferred Qualifications
  • Experience in the financial services domain, particularly Payments.
  • Familiarity with GenAI and Large Language Models (LLMs).
  • Experience integrating mainframe systems with APIs or Kafka.
  • Experience with modern frontend tooling (e.g., Webpack, Vite, Jest, Cypress).
  • 6+ years of relevant experience in full stack development or systems analysis.
  • Proven track record of delivering complex, high-impact projects.
  • Subject Matter Expert (SME) in one or more areas of application development.
  • Strong leadership, stakeholder management, and project delivery skills.

Education
  • Bachelor's degree or equivalent experience required
  • Master's degree preferred

This job description provides a high-level overview of responsibilities. Additional duties may be assigned as needed.
Job Family Group:
Technology
Job Family:
Applications Development
Time Type:
Full time
Primary Location:
New Castle Delaware United States
Primary Location Full Time Salary Range:
$125,760.00 - $188,640.00
In addition to salary, Citi's offerings may also include, for eligible employees, discretionary and formulaic incentive and retention awards. Citi offers competitive employee benefits, including: medical, dental & vision coverage; 401(k); life, accident, and disability insurance; and wellness programs. Citi also offers paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays. For additional information regarding Citi employee benefits, please visit citibenefits.com. Available offerings may vary by jurisdiction, job level, and date of hire.
Most Relevant Skills
Please see the requirements listed above.
Other Relevant Skills
For complementary skills, please see above and/or contact the recruiter.
Anticipated Posting Close Date:
Jun 09, 2026
Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.
If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.
View Citi's EEO Policy Statement and the Know Your Rights poster.

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