Analyst Developer PL/I – Mainframe

KEYES; Brussel Hoofdstad; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Company car

Mobility budget

Meal vouchers

Job summary

KEYES is seeking an Analyst Developer PL/I – Mainframe to reinforce a Mainframe development team within a large Belgian organisation. You will combine technical analysis, hands‑on development, maintenance, testing and application support on legacy PL/I applications in a IBM Mainframe environment.

You will contribute to stability, evolution and long‑term maintainability, working with cross‑functional teams and stakeholders to ensure production readiness and quality.

Qualifications

• Extensive PL/I experience in a professional Mainframe environment.
• Strong knowledge of IBM Mainframe and z/OS.
• Experience with DB2 and SQL.
• Good understanding of JCL and batch processing.
• Experience with testing and production support.

Responsibilities

• Perform technical analysis of existing Mainframe applications and business requirements.
• Develop, modify and maintain applications written in PL/I.
• Work on corrective and evolutionary maintenance of business‑critical applications.
• Analyse existing code, application flows and technical dependencies before implementing changes.
• Develop and maintain batch processing and, where applicable, transactional processing.
• Work with DB2 databases and embedded SQL within Mainframe applications.
• Create, modify and maintain JCL jobs and batch chains.
• Work with IMS / DL/I and CICS environments where applicable.
• Perform unit, integration and non‑regression testing.
• Investigate application issues, production incidents and defects.
• Perform troubleshooting and root cause analysis on Mainframe applications.
• Analyse ABENDs, batch failures, SQL errors and application behaviour.
• Support deployment and production activities.
• Contribute to performance optimisation of Mainframe programs and database access.
• Collaborate with analysts, developers, production teams and stakeholders.
• Document technical analyses, developments and fixes.
• Contribute to long‑term stability and maintainability of legacy systems.

Skills

PL/I

Mainframe

DB2

JCL

CICS

ISPF/TSO

Analytical thinking

Tools

IMS/DL/I

z/OS

SQL

CICS

Job description

JOIN KEYES AS

Analyst Developer PL/I – Mainframe

ABOUT US

KEYES delivers integrated digital solutions through a unique ecosystem with seven areas of expertise: Infrastructure & Cloud, Cybersecurity, Data & AI, Business Software, Mainframe, Advisory and Staffing. Together, these capabilities help organisations of all sizes transform, perform and grow their responsibly.

As a trusted partner in the digital ecosystem, KEYES supports both private and public organisations in addressing their strategic challenges. We design and deliver end-to-end solutions that drive performance, agility and resilience.

At KEYES, our people collaborate across areas of expertise, contribute to impactful projects and help shape the digital future.

More information : www.keyes.eu

ABOUT THE MISSION

CONTEXT : As part of the reinforcement of a Mainframe development team within a large Belgian organisation, we are looking for an experienced Analyst Developer PL/I to work on business-critical applications in an IBM Mainframe environment.

You will combine technical analysis, hands‑on development, corrective and evolutionary maintenance, testing and application support.

You will work on legacy applications that remain central to the organisation’s operational processes and will contribute to their stability, evolution and long‑term maintainability.

The role requires both strong analytical capabilities and the ability to work directly with existing PL/I applications, understand complex dependencies and implement reliable technical changes

YOUR MAIN RESPONSIBILITIES :

• Perform technical analysis of existing Mainframe applications and business requirements.
• Develop, modify and maintain applications written in PL/I.
• Work on corrective and evolutionary maintenance of business‑critical applications.
• Analyse existing code, application flows and technical dependencies before implementing changes.
• Develop and maintain batch and, where applicable, transactional processing.
• Work with DB2 databases and embedded SQL within Mainframe applications.
• Create, modify and maintain JCL jobs and batch chains.
• Work with IMS / DL/I and CICS environments where applicable.
• Perform unit, integration and non‑regression testing.
• Investigate application issues, production incidents and technical defects.
• Perform troubleshooting and root cause analysis on Mainframe applications.
• Analyse ABENDs, batch failures, SQL errors and application behaviour.
• Support deployment and production activities.
• Contribute to performance optimisation of Mainframe programs and database access.
• Collaborate with functional analysts, developers, production teams and business stakeholders.
• Document technical analyses, developments, fixes and application changes.
• Contribute to the long‑term stability and maintainability of legacy systems.

YOUR PROFILE :

• Proven professional experience as a PL/I Developer, Mainframe Developer, Analyst Programmer or Analyst Developer.
• Strong hands‑on experience with PL/I / PL1 in a professional Mainframe environment.
• Good knowledge of IBM Mainframe and z/OS environments.
• Strong experience with DB2 and SQL.
• Good knowledge of JCL and batch processing.
• Experience with technical analysis and application development.
• Ability to analyse and understand existing legacy code with limited documentation.
• Experience in corrective and evolutionary maintenance.
• Good understanding of testing, debugging and application support processes.
• Experience with TSO / ISPF is expected.
• Experience with CICS is a strong asset.
• Experience with IMS / DL/I is a strong asset.
• Experience with BMP or transactional Mainframe processing is an asset.
• Experience with schedulers such as TWS, Control-M or equivalent is an asset.
• Experience in production support, incident analysis and ABEND troubleshooting is highly appreciated.
• Experience in banking, insurance, healthcare, mutualities or other business‑critical legacy environments is a strong asset.
• Ability to work independently from technical analysis through development, testing and production support.
• Strong analytical mindset, accuracy and problem‑solving skills.
• Good communication skills and ability to collaborate with both technical and business teams.
• French or Dutch: professional level required.
• English: professional level required.

WHAT WE OFFER :

Comprehensive Compensation Package

• Permanent contract or freelance stat
• Company car as part of our gradual transition to an electrified fleet, or a mobility budget
• A wide range of extra‑legal benefits, including insurance coverage, a cafeteria benefits plan, meal vouchers, eco‑vouchers, fixed expense allowances, internet, mobile phone, individual and collective performance bonuses

Learning & Career Development

• Unlimited access to over 25 000 learning resources through our e-learning platform
• Soft skills and technical certifications to continuously develop your expertise
• A personalised career development plan, supported by mentoring and internal career opportunities

Culture & Team Spirit

• A company recognised as a Top Employer for several consecutive years
• Plenty of opportunities to connect and spend time together, including after-work events, food trucks, Family Day and more
• An environment where knowledge sharing, learning and collaboration are part of everyday life

Impact & flexibility

• A hybrid working model combining remote work and on‑site presence
• The opportunity to contribute to large-scale IT projects that make a difference for our clients and end users
• A genuine commitment to more responsible IT practices and reducing our environmental footprint

OUR RECRUITMENT PROCESS

We have designed a simple, transparent and efficient recruitment process to help you discover KEYES, our teams and our projects in the best possible conditions.