SOFTWARE ENGINEERING DEVELOPMENT

Kyndryl; Comunidad de Madrid; Hybrid; EUR 45,000 - 70,000; Full time

Benefits offered by this job

Be Well program

Learning and certification benefits

Job summary

Kyndryl is seeking a software engineer to design, build, and maintain high-volume business logic on the mainframe, while refactoring legacy code for cloud- and mobile-ready interactions. You will work in a hybrid-friendly environment that values learning and collaboration, with opportunities to advance through certification paths and hands-on experiences.

You will join a global team delivering modernization projects, applying strong OOP design, REST services, and data-domain expertise across

Qualifications

• Experience working on complex software projects.
• start
• Proficient coding skills in Java, Python and .NET with debugging ability.
• Experience with scalable, robust software development.

Responsibilities

• Maintain performance by optimizing code on the mainframe modernization platform.
• Debug, troubleshoot and analyze complex system interactions.
• Migrate or integrate legacy logic with cloud-based services.

Skills

Java

Python

.NET

REST APIs

OOP

Design patterns

Relational databases

NoSQL databases

Microservices

Docker

Kubernetes

DevOps tools

Education

Bachelor's degree in Computer Science

Tools

Docker

Kubernetes

CI/CD tools

Job description

Who We AreAt Kyndryl, we run and reimagine the mission-critical technology systems that drive advantage for the world’s leading businesses. We are at the heart of progress; with proven expertise and a continuous flow of AI-powered insight, enabling smarter decisions, faster innovation, and a lasting competitive edge. For our people—Kyndryls—that means doing purposeful work that powers human progress. Join us and experience a flexible, supportive environment where your well-being is prioritized and your potential can thrive.The RoleYour role Bring your specialist knowledge and experience to a company managing 50% of the world’s MIPS and play a critical role in our modernization mission. You’ll be in good company among our global community of experts leading the future of mainframe modernization. Experts who share knowledge openly and collaborate freely. In this role, you’ll design, build and maintain the high-volume business logic that runs on the mainframe. At the same time you’ll play a key role in refactoring legacy code to enable modern cloud and mobile applications to seamlessly interact with the mainframe’s core data. What you will do Maintain Performance •Prevent decay and find efficiencies: Monitor the architecture and identify opportunities to optimize code to maintain and enhance mainframe performance. Debug and Test •Find and fix: Debug, troubleshoot, and analyze complex system interactions to keep mission-critical applications running. Develop for the Future •Bridge the gap: As an instrumental player in modernization, you’ll extract business logic from legacy systems for migration or integration with cloud-based services.Who You AreRequired skills and experience •Experience working as a software engineer on complex software projects. •Excellent coding skills and solid development experience (Java, Python, .Net etc.) with debugging and problem-solving skills. •Software development methodologies, with demonstrated experience developing scalable and robust software. •Experienced in relational and NoSQL databases, data mapping, XML/JSON, REST-based web services. •Knowledge of architecture design - Microservices architecture, containers (Docker & k8s), messaging queues. •Deep understanding of OOP and design patterns. Preferred skills and experience •Bachelor's degree in Computer Science, related technical field, or equivalent practical experience. •Certification in one or more of the hyperscalers (Azure, AWS, and Google GCP) - otherwise, you can obtain certifications with Kyndryl. •Experience with DevOps tools and modern engineering practices.Being YouThe “Kyn” in Kyndryl means kinship, which represents the strong bonds we have with each other, our customers and our communities. We focus on ensuring all Kyndryls feel included and we welcome people of all cultures, backgrounds, and experiences. Even if you don’t meet every requirement, we encourage you to apply. We believe in growth, and we’re excited to see what you can bring. At Kyndryl, employee feedback has told us that our number one driver of employee engagement is belonging. That sense of belonging — being a valued, respected, trusted member of the team — is fundamental to our culture and fueling great experiences for our customers. This dedication to welcoming everyone into our company means that Kyndryl gives you the ability to thrive and contribute to our culture of empathy and shared success. That’s The Kyndryl Way.What You Can ExpectYour career with us isn’t just a job—it’s an adventure with purpose. We offer a dynamic, hybrid-friendly culture that supports your well-being and empowers you to grow. Our Be Well programs are thoughtfully designed to support your financial, mental, physical, and social health—because we know that when you feel your best, you do your best.From your very first day, you’ll dive into impactful work that powers the systems our customers rely on every day. You won’t just contribute—you’ll make a difference, tackling meaningful projects that sharpen your skills and fuel your growth.We’re here to champion your journey. With powerful tools to chart your career path, personalized development goals aligned with your ambitions, and continuous feedback to keep you inspired and on track, you’ll have everything you need to thrive and evolve. You’ll develop in-demand skills to grow your career and achieve your ambitions with access to cutting-edge learning opportunities—from certifications with Microsoft, Google, and Amazon to coaching and hands-on experiences. And through it all, you’ll be part of a culture that values empathy, restless learning, and a devotion to shared success.We want you to thrive here—and we’re committed to helping you do just that. Ready to make an impact? Join us and help shape what’s next.Get Referred!If you know someone that works at Kyndryl, when asked ‘How Did You Hear About Us’ during the application process, select ‘Employee Referral’ and enter your contact's Kyndryl email address.