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Leighton

Mainframe Solutions Architect – Contract

Leighton

. Provide independent architectural oversight, technical assurance, and strategic direction throughout migration of legacy business-critical applications into AWS-hosted solutions .

Posted 11/10/2026contractRemote • United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates extensive experience in Java Software Engineering and Enterprise Application Architecture, with a strong focus on AWS Migration Planning and Cloud Service Selection. Capable of providing independent architectural oversight and strategic direction for legacy modernization initiatives within multi-cloud and hybrid-cloud environments.

Highest-signal resume keywords
Java Software EngineeringAWS Migration PlanningEnterprise Application ArchitectureLegacy Modernisation InitiativesMulti-Cloud Environments

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Cloud MigrationArchitecture DesignReplatformingRefactoringApplication AssessmentTechnical AssuranceArchitecture GovernanceCost OptimisationSoftware LicensingCloud Service Selection
Soft Skills
Effective CommunicationStakeholder EngagementIndependent Architectural GuidanceChallenging Assumptions
Industry Keywords
Legacy ApplicationsHybrid CloudCloud Adoption StrategiesOperational RequirementsSecurity ComplianceBusiness RequirementsCommercial ModellingTransformation Programmes

Tech Stack

Tools & technologies
AWSCloudJava

About the role

Key responsibilities & impact
  • Provide independent architectural oversight, technical assurance, and strategic direction throughout migration of legacy business-critical applications into AWS-hosted solutions
  • Assess modernisation and migration approaches for practicality, proven effectiveness, and alignment with long-term architecture objectives
  • Review cloud adoption strategies, application designs, and technology selections against operational, security, resilience, compliance, and business requirements
  • Identify architectural risks, dependencies, constraints, and design trade-offs, recommending viable alternatives
  • Evaluate commercial considerations including software licensing, platform costs, tooling options, and third-party services
  • Produce recommendations, architecture assessments, and governance artefacts supporting programme decisions and investment cases
  • Analyse legacy application landscapes across hybrid and multi-cloud environments
  • Advise on remediation, refactoring, and modernisation strategies for established Java-based platforms
  • Engage with technical and executive stakeholders

Requirements

What you’ll need
  • Extensive experience in Java software engineering and enterprise application architecture
  • Delivery of large-scale legacy modernisation initiatives, including replatforming, refactoring, or cloud migration programmes
  • Strong AWS expertise, covering migration planning, architecture design, target-state definition, and cloud service selection
  • Experience working with complex legacy technology estates and long-lived application portfolios
  • Knowledge of software licensing, commercial modelling, and cost optimisation considerations within transformation programmes
  • Ability to challenge assumptions, provide independent architectural guidance, and communicate effectively with senior business and technical stakeholders
  • Experience operating within multi-cloud and hybrid-cloud environments

Benefits

Comp & perks
  • A competitive salary dependent on experience
  • A contributory pension scheme
  • Private healthcare
  • 25 days annual leave, plus bank holidays
  • Opportunity to buy or sell holiday
  • Flexible approach to working hours
  • Continuous personal development, career path and training