Top Companies Hiring for Mainframe Developer Jobs

Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, building the bridge between AI investment and enterprise value by building full-stack AI solutions for our clients. Our deep industry, process and engineering expertise enables us to build an organization’s unique context into technology systems that amplify human potential, realize tangible returns and keep global enterprises ahead in a fast-changing world. See how at www.cognizant.com or @cognizant.

From day one, IBMers have the trust to create incredible things that alter the future for us, for each other, for our clients — and for the world. Around the globe, we’re constantly evolving who we are, adapting with purpose, and building an environment where everyone thrives, both individually and collectively. In partnership with our clients, we lead the way in groundbreaking technologies to make a difference in local communities – IBMers innovate with curiosity, openness, and a shared commitment to redefine industries and build what’s next.

DXC Technology is a Fortune 500 global IT services leader. Our more than 130,000 people in 70-plus countries are entrusted by our customers to deliver what matters most. We use the power of technology to deliver mission critical IT services across the Enterprise Technology Stack to drive business impact. DXC is an employer of choice with strong values, and fosters a culture of inclusion, belonging and corporate citizenship. We are DXC. What we do We deliver the IT services our customers need to modernize operations and drive innovation across their entire IT estate. We provide services across the Enterprise Technology Stack for business process outsourcing, analytics and engineering, applications, security, cloud, IT outsourcing and modern workplace. How we work Every day, we earn our customers’ trust by delivering transformative technologies to ensure the success, safety and well-being of businesses and people worldwide. We provide world-class IT services at scale from our Global Innovation and Delivery Centers in North America, South America, Europe, Asia and Australia. Our globally connected centers enable us to solve complex technology challenges and transform our customers’ businesses through our dedicated delivery workforce of more than 110,000 people. With globally distributed teams and rich engineering skills, DXC offers competitive solutions to address customers’ cost, regulatory, language and business continuity requirements. We leverage the power of partnerships through our curated DXC ecosystem of technology leaders. By combining strengths and expertise globally, we create solutions and deliver greater outcomes for customers across the Enterprise Technology Stack. Our values Our values are the fabric of DXC. They bind us together regardless of where or how we work and position us to succeed on our transformation journey. Deliver... We do what we say we are going to do. Collaborate... We work as a team - globally and locally. Community... We believe in stewardship and building a sustainable company that supports our communities. Care... We take care of each other and foster a culture of inclusion and belonging. Do the right thing... We act with integrity.

At Capgemini, we are driven by a shared purpose: Unleashing human energy through technology for an inclusive and sustainable future. As a leading strategic partner to companies around the world, we have leveraged technology to enable business transformation for more than 50 years. We address the entire breadth of business needs, from strategy and design to managing operations. To do this, we draw on deep industry expertise and a command of the fast-evolving fields of cloud, data artificial intelligence, connectivity, software, digital engineering, and platforms.

BNY is a global financial services platforms company at the heart of the world’s capital markets. For more than 240 years BNY has partnered alongside clients, using its expertise and platforms to help them operate more efficiently and accelerate growth. Today BNY serves over 90% of Fortune 100 companies and nearly all the top 100 banks globally. BNY supports governments in funding local projects and works with over 90% of the top 100 pension plans to safeguard investments for millions of individuals. As of March 31, 2026, BNY oversees $59.4 trillion in assets under custody and/or administration and $2.1 trillion in assets under management. NYSE: BNY BNY is the corporate brand of The Bank of New York Mellon Corporation (NYSE: BNY). Headquartered in New York City, BNY has been named among Fortune's World's Most Admired Companies and Fast Company's Best Workplaces for Innovators. Additional information is available on www.bny.com. Follow BNY on Instagram & X: @BNYglobal

Genpact (NYSE: G) is a global professional services firm that makes business transformation real. We drive digital-led innovation and digitally-enabled intelligent operations for our clients, guided by our experience running thousands of processes for hundreds of Global Fortune 500 companies. We think with design, dream in digital, and solve problems with data and analytics. We obsess over operations and focus on the details – all 78,000+ of us. From New York to New Delhi and more than 20 countries in between, Genpact has the end-to-end expertise to connect every dot, reimagine every process, and reinvent companies’ ways of working. We know that rethinking each step from start to finish will create better business outcomes. We began in 1997 as a business unit within GE. In January 2005, we became an independent company to bring our process expertise and unique DNA in Lean management to clients beyond GE, and then in August 2007, we became a publicly-traded company.

Accenture is a leading solutions and services company that helps the world’s leading enterprises reinvent by building their digital core and unleashing the power of AI to create value at speed across the enterprise, bringing together the talent of our approximately 786,000 people, our proprietary assets and platforms, and deep ecosystem relationships. Our strategy is to be the reinvention partner of choice for our clients and to be the most client-focused, AI-enabled, great place to work in the world. Through our Reinvention Services we bring together our capabilities across strategy, consulting, technology, operations, Song and Industry X with our deep industry expertise to create and deliver solutions and services for our clients. Our purpose is to deliver on the promise of technology and human ingenuity, and we measure our success by the 360° value we create for all our stakeholders. Visit us at accenture.com.

U.S. Bancorp, with more than 70,000 employees and $678 billion in assets as of December 31, 2024, is the parent company of U.S. Bank National Association. Headquartered in Minneapolis, the company serves millions of customers locally, nationally and globally through a diversified mix of businesses including consumer banking, business banking, commercial banking, institutional banking, payments and wealth management. U.S. Bancorp has been recognized for its approach to digital innovation, community partnerships and customer service, including being named one of the 2024 World’s Most Ethical Companies and one of Fortune’s most admired superregional banks. To learn more, please visit the U.S. Bancorp website at usbank.com and click on “About Us.” Equal Housing Lender. Credit products are offered by U.S. Bank National Association and subject to normal credit approval. Some restrictions may apply. Deposit products offered by U.S. Bank National Association. Member FDIC.

Working at Citi is far more than just a job. A career with us means joining a team of more than 225,000 dedicated people from around the globe. At Citi, you’ll have the opportunity to grow your career, give back to your community and make a real impact. At Citi, we stand firm in our commitment to our values, and we look for people who share those values with us. We believe in doing what is right – for our clients and our people. Citi's mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. We have set expectations for how we must act to bring our mission to life. These expectations are at the heart of our Leadership Principles – we take ownership, we deliver with pride, and we succeed together.

Bank of America is one of the world’s leading financial institutions, serving individual consumers, small and middle-market businesses and large corporations with a full range of banking, investing, asset management and other financial and risk management products and services. We provide unmatched convenience in the United States, serving approximately 68 million consumer and small business clients with approximately 3,900 retail financial centers, approximately 15,000 ATMs and award-winning digital banking with approximately 56 million verified digital users. We are a global leader in wealth management, corporate and investment banking and trading across a broad range of asset classes, serving corporations, governments, institutions and individuals around the world. Bank of America offers industry-leading support to approximately 3 million small business households through a suite of innovative, easy-to-use online products and services. We serve clients through operations across the United States, its territories and more than 35 countries. By driving Responsible Growth, we deliver for teammates, clients, and the communities we serve. Being a Great Place to Work for our teammates is core to our approach. Our goal continues to be a company where people want to work today and build a career. We provide employees with access to leading benefits and programs that help teammates be well—physically, emotionally and financially. And we provide a variety of resources to help teammates grow in their roles and build new skills. Our diversity—in thought, style, gender, sexual orientation, gender identity, race, ethnicity, culture, religion, age, ability, military status and experience—makes us stronger and is essential for us to serve our clients, fulfill our purpose and drive Responsible Growth.