[Hiring] Mainframe Solutions Architect @Leighton

Role Description

This opportunity is ideally suited to a senior Java/Mainframe Solutions Architect with deep experience in large-scale application transformation, legacy estate modernisation, and cloud migration programmes. Candidates should have a proven track record of guiding organisations through complex transitions from traditional platforms to modern cloud-native environments.

The assignment focuses on providing independent architectural oversight, technical assurance, and strategic direction throughout the migration of legacy business-critical applications into AWS-hosted solutions. The successful consultant will be expected to draw upon previous experience delivering comparable transformation initiatives and confidently engage with both technical and executive stakeholders.

Responsibilities:

• Assessing proposed modernisation and migration approaches to ensure they are practical, proven, and aligned with long-term architecture objectives.
• Reviewing cloud adoption strategies, application designs, and technology selections to validate suitability against operational, security, resilience, compliance, and business requirements.
• Highlighting architectural risks, dependencies, constraints, and design trade-offs, while recommending viable alternative approaches where appropriate.
• Evaluating commercial considerations associated with migration programmes, including software licensing, platform costs, tooling options, and third-party services.
• Producing recommendations, architecture assessments, and governance artefacts to support programme decision-making and investment cases.
• Analysing legacy application landscapes operating across hybrid and multi-cloud environments.
• Advising on application remediation, refactoring, and modernisation strategies for established Java-based platforms.

Qualifications

• 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.
• The 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.

Behaviours

• An open and genuine communicator.
• Able to take responsibility for your actions.
• Always learning and wanting to improve.
• Takes responsibility for own development.
• Love what you do.
• Value and support your team.
• Embrace who you are.
• Open minded and willing to explore new ideas.

Benefits

• A competitive salary this will be dependent on experience.
• A contributory pension scheme.
• Private healthcare.
• 25 days annual leave, plus bank holidays and the opportunity to buy or sell holiday.
• A flexible approach to working hours.
• Continuous personal development, career path and training.
• And more....