We are seeking a Senior Mainframe Developer to join our team working on a cutting-edge Mainframe Security Product. This role is ideal for an experienced developer with deep expertise in Assembler and REXX, as well as strong skills in JCL, ISPF, and mainframe utilities. The ideal candidate will be able to follow senior guidance while also taking ownership of tasks and leading when necessary.

The role requires a developer who is comfortable working both independently and collaboratively in a structured environment while ensuring the development and maintenance of robust, high-quality mainframe security solutions.

Key Responsibilities:

Technical Development & Implementation

Assembler
Develop, enhance, and maintain system-level mainframe security solutions using IBM Assembler.
Optimize performance and efficiency of low-level system functions.
Debug and troubleshoot assembler code for complex system interactions.
REXX
Develop and maintain REXX scripts to automate system operations, testing, and data processing.
Integrate REXX with mainframe utilities and security components.
Optimize and refactor existing REXX-based automation processes.

Mainframe Operations & Utilities

JCL & Utilities
Create, update, and optimize JCL scripts for batch job execution.
Utilize mainframe utilities for data processing, scheduling, and job control.
ISPF
Develop and enhance ISPF panels and dialogs for better user experience.
Work with ISPF services for efficient mainframe data manipulation.

Collaboration & Leadership

Follow technical direction from senior architects and engineers, aligning development work with strategic goals.
Work independently when required, leading development tasks or small teams to ensure timely delivery of high-quality code.
Actively participate in code reviews, design discussions, and technical mentorship.
Collaborate with cross-functional teams, including QA, DevOps, and Product Management.

Required Skills & Qualifications:

Technical Skills (Must-Have)

Expertise in IBM Assembler (minimum 10yrs exp) – Strong ability to write, debug, and optimize Assembler code for mainframe security applications.
Expertise in REXX scripting (minimum 8yrs exp) – Proven ability to develop automation scripts and integrate REXX with security and system management tools.
10+ years of hands-on, consistent experience with z/OS and mainframe computers.
8+ years of experience with z/OS internals, ISPF, JCL, CICS, DB2, SDSF, SQL.
8+ years of experience designing software systems running on z/OS.

Soft Skills

Excellent written and verbal communication skills. Ability to effectively communicate product architectures, design proposals and negotiate options at management levels.
Ability to work independently while also taking lead responsibilities when needed.
Strong analytical and problem-solving skills in a mainframe environment.

Nice-to-Have Skills

Experience with JIRA or any other project management tools. Excellent communication skills to facilitate discussions with cross-functional teams and stakeholders. Prior experience working in Agile environments, including sprint planning, retrospectives, and backlog grooming.

Information Security:

Information security is everyone’s responsibility. A fundamental principle of information security at Rocket Software is that all individuals in the organization have a responsibility for the security and protection of company information and IT Resources over which they have control, according to their role.

Diversity, Inclusion & Equity:

At Rocket we are committed to an inclusive workplace environment, where every Rocketeer can thrive by bringing their full selves to work. Being a Rocketeer means you are part of our movement to continually drive inclusivity, diversity and equity in our workforce.

What Rocket Software can offer you in Vilnius:

Health Insurance: Choose from 3 great options!
Generous Time Off: Enjoy 25 days of annual leave, plus Juneteenth as an extra day off for everyone.
Rocket enhanced parental leave benefit.
Easy Sick Days: Get 6 days of fully paid sick leave without needing a medical certificate.
Employee Assistance Program – Digital Courses & Meditations, Certified Personal Coaching & Personal Therapy sessions.
Workcation Policy: Enjoy the flexibility to work from a vacation spot, combining work and leisure.
Choose your own hybrid/remote work model

Annual salary range for this position is between €52,500.00 - €97,500.00 gross before taxes.

Salary range applies only to candidates in Lithuania

Salary offer for the candidate is determined based on the predefined salary ranges for the position and depends on the level of competence and experience of the candidate.

Rocket Software Inc. is committed to creating a diverse environment and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. Rocket Software Inc. is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

Rocket is committed to working with and providing reasonable accommodation to individuals with physical and mental disabilities. If you need special assistance or an accommodation while seeking employment, please call: 781-577-4321 or send an email to people@rocketsoftware.com. We will make a determination on your request for reasonable accommodation on a case-by-case basis.

_If you like wild growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us!