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Lead Engineer & Software Architect with 20+ years’ experience designing and modernising large-scale distributed systems across banking, fintech, and enterprise platforms. Expertise in AWS cloud-native architectures, event-driven systems, and domain-driven design, delivering secure and highly available platforms with mission-critical workloads. Specialises in legacy-to-cloud modernisation, enterprise architecture governance, and building regulated, compliant systems in financial services. Proven ability leading cross-functional teams (8+ engineers), establishing technical standards, and aligning architecture with business objectives to drive digital transformation.…Lead Engineer & Software Architect with 20+ years’ experience designing and modernising large-scale distributed systems across banking, fintech, and enterprise platforms. Expertise in AWS cloud-native architectures, event-driven systems, and domain-driven design, delivering secure and highly available platforms with mission-critical workloads. Specialises in legacy-to-cloud modernisation, enterprise architecture governance, and building regulated, compliant systems in financial services. Proven ability leading cross-functional teams (8+ engineers), establishing technical standards, and aligning architecture with business objectives to drive digital transformation.

Samuel Santos

Back-End Developer, Software Engineer, AI Developer, +4

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Lead Engineer & Software Architect with 20+ years’ experience designing and modernising large-scale distributed systems across banking, fintech, and enterprise platforms. Expertise in AWS cloud-native architectures, event-driven systems, and domain-driven design, delivering secure and highly available platforms with mission-critical workloads. Specialises in legacy-to-cloud modernisation, enterprise architecture governance, and building regulated, compliant systems in financial services. Proven ability leading cross-functional teams (8+ engineers), establishing technical standards, and aligning architecture with business objectives to drive digital transformation.…Lead Engineer & Software Architect with 20+ years’ experience designing and modernising large-scale distributed systems across banking, fintech, and enterprise platforms. Expertise in AWS cloud-native architectures, event-driven systems, and domain-driven design, delivering secure and highly available platforms with mission-critical workloads. Specialises in legacy-to-cloud modernisation, enterprise architecture governance, and building regulated, compliant systems in financial services. Proven ability leading cross-functional teams (8+ engineers), establishing technical standards, and aligning architecture with business objectives to drive digital transformation.

Available to hire

Lead Engineer & Software Architect with 20+ years’ experience designing and modernising large-scale distributed systems across banking, fintech, and enterprise platforms. Expertise in AWS cloud-native architectures, event-driven systems, and domain-driven design, delivering secure and highly available platforms with mission-critical workloads.

Specialises in legacy-to-cloud modernisation, enterprise architecture governance, and building regulated, compliant systems in financial services. Proven ability leading cross-functional teams (8+ engineers), establishing technical standards, and aligning architecture with business objectives to drive digital transformation.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Work Experience

Lead Engineer – BnPL Platform Modernization at Commonwealth Bank (CBA) — Sydney, Australia

July 1, 2025 - Present

Enterprise-scale mainframe-to-cloud transformation for Buy Now Pay Later financial systems. Led modernisation initiatives migrating complex mainframe financial platforms to AWS to enable scalable processing for 50K+ daily transactions with 99.99% availability requirements. Architected hybrid integration using Clean Architecture and Domain-Driven Design to create modular systems that reduced deployment risk by 40% while maintaining financial compliance. Designed high-throughput data pipelines using AWS Transfer Family, S3, Lambda and Step Functions for secure data movement between legacy and cloud systems. Implemented an enterprise observability framework with CloudWatch and OpenTelemetry, reducing incident detection time by 60% and improving MTTR by 45%. Established cloud governance standards including secrets management (HashiCorp Vault, AWS Secrets Manager) and feature flag governance (LaunchDarkly). Integrated LLM-based development acceleration workflows using GPT/Claude to improve

Software Architect – Digital Mortgage Platform at Lendus — Sydney, Australia

July 1, 2024 - July 1, 2025

Cloud-native platform connecting consumers with 30+ lenders. Architected serverless Azure solutions for a mortgage comparison platform, reducing infrastructure costs by 35% through optimised serverless design. Implemented CQRS pattern for scalable API architecture, enabling near real-time loan processing with sub-second response times. Designed a multi-database strategy using CosmosDB (NoSQL) and SQL Server based on specific access patterns and business requirements. Led full CI/CD implementation with GitHub Actions, achieving 95% automated test coverage and streamlining deployment processes. Established distributed tracing using OpenTelemetry and Elastic Search/Kibana for real-time system insights.

Principal Engineer – Accounting Platform Modernization at MYOB — Sydney, Australia

September 1, 2022 - June 30, 2024

Enterprise SaaS accounting platform serving 1M+ businesses. Led Strangler Fig migration to deconstruct a monolithic CRM into microservices, improving system scalability and enabling independent team deployments. Championed Infrastructure as Code using CloudFormation, reducing environment provisioning from days to hours. Designed event-driven workflows with Kafka for real-time data processing across distributed systems. Established architecture governance and technical standards across engineering teams, improving system performance by 40%. Mentored three senior engineers into technical leadership roles, strengthening team capability.

Engineering Lead / DevOps at OpenAgent - Doorsteps Group — Sydney, Australia

March 1, 2022 - September 1, 2022

Migrated legacy architecture to modern AWS 3-tier infrastructure. Implemented CI/CD pipelines reducing deployment time by 70%. Introduced event-driven architecture patterns including CQRS and Event Sourcing.

Engineering Manager at Propper - Doorsteps Group — Sydney, Australia

March 1, 2021 - March 1, 2022

Led a team of 6 engineers, improving team velocity by 30%. Established Agile practices and a continuous improvement culture. Integrated AWS solutions with external applications.