Rivant

Expert Operational Security Engineer - Mainframe

Sector: Banking

Location: Brussels

Contract length: 12 months

Estimated daily rate (EUR): 720 - 850

Languages: English (Dutch/French a plus)

Estimated daily rates are Rivant market estimates for guidance — not a client rate card.

Role details

Start date: 2026-11-02

Duration: 12 months

Extension possible: Not specified

Education: Bachelor's degree

Location detail: Brussels (5 min walk from Central Station) - 50% on site / 50% homeworking. Travel N/A. Remote/telework from Belgium only

About the role

A major Belgian bank in Brussels needs an Expert Mainframe Operational Security Engineer in IT Security Production. You keep the Mainframe estate secure, compliant and resilient: set and enforce security standards, manage RACF and related controls, support encryption and HSM work, assess new Mainframe products before go-live, and help resolve security incidents with minimal disruption.

Responsibilities

  • Manage user permissions and access for systems outside IAM without blocking operations
  • Manage RACF database content manually or via automation
  • Create clear security documentation and standards for delivery teams
  • Handle encryption tasks from importing certificates to configuring HSM agents
  • Assess security of new Mainframe products before go-live
  • Resolve security incidents with the squad and support auditors with compliance evidence

Business experience

SkillLevelPriority
Cybersecurity experience with hands-on Mainframe expertiseNot specifiedMandatory
Financial sector experienceNot specifiedPreferable

Functional experience

SkillLevelPriority
At least 10 years of relevant experience≥10 yearsMandatory
RACF Security Administrator certificationNot specifiedMandatory
On-call participation for critical job failures (~1 week per month including weekends/holidays)Not specifiedMandatory

Technical experience

SkillLevelPriority
RACF and surrounding utilitiesNot specifiedMandatory
Mainframe architecture and basic tools (JCL, ISPF, REXX, SDSF)Not specifiedMandatory
Role-based security modellingNot specifiedMandatory
AT-TLS and certificates; Public Key Infrastructure and Mainframe CryptoCardsNot specifiedMandatory
Security of DB2, IMS and MQ; job scheduling; Mainframe subsystems securityNot specifiedMandatory
Unix System ServicesNot specifiedMandatory
zSecure product suite; Control-M; COBOL; EndevorNot specifiedPreferable

Language requirements

English (Dutch/French a plus)

LanguageSpeakingReadingWritingMandatory
EnglishGoodGoodGoodYes
DutchGoodGoodGoodNo
FrenchGoodGoodGoodNo

Soft skills

  • Analytical — navigate conflicting security rules across manuals
  • Critical thinking — check requests against security standards
  • Problem-solving — trace vague errors to root cause
  • Creativity — design custom solutions for compliance points without a playbook
  • Agile teamwork with ownership; proactive risk spotting in high-volume environments

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