# Dimitris Hantzis Principal Software Engineer & Systems Architect Enterprise Platforms • Architecture & Technical Leadership • Operational Systems London, UK [info@dimitrishantzis.com](mailto:info@dimitrishantzis.com) [linkedin.com/in/dchantzis](https://www.linkedin.com/in/dchantzis/) ## About Principal Software Engineer and Systems Architect with 20 years of experience architecting, delivering, and evolving enterprise-scale operational platforms across e-commerce, logistics, fulfilment, inventory, and financial domains. Specialised in modernising and evolving business-critical platforms under live operational constraints, balancing architectural transformation, operational continuity, and long-term maintainability. Proven track record of owning cross-system architecture, building and evolving resilient business-critical operational platforms, and resolving high-impact business risks through pragmatic, observable, and scalable engineering. Operates at the intersection of engineering, operations, and business, aligning technical decisions with real-world delivery, reliability, and continuity needs. Incorporates AI-assisted software engineering where it adds value, helping accelerate solution design, improve engineering productivity, and enhance software quality while maintaining strong engineering fundamentals and sound architectural judgement. --- ## Key Impact ### Platform Ownership - Architected, delivered and evolved the central OMS, acting as the operational coordination layer across inventory, purchasing, fulfilment, warehouse, storefront, and financial systems. ### Transformation - Led architectural transformation and modernisation of legacy systems and business-critical workflows. - Rebuilt and repurposed core WMS from PHP 5.6 to PHP 8.4. ### Operational - Prevented critical operational and financial risks across business-critical workflows. - Designed resilient operational infrastructure incorporating queue orchestration, automated recovery, observability, auditability, and fault-tolerant workflow execution across critical business systems. ### Technical - Optimised legacy data models and system-level algorithms, significantly improving performance, efficiency, and scalability across high-volume transactional systems. - Designed and implemented scalable integration architecture enabling reliable synchronisation and data interchange across storefront, warehouse, ERP, and financial platforms. ### Engineering Standards - Established AI-assisted development standards, system-specific engineering blueprints, and architectural reference frameworks across multiple enterprise platforms. --- ## Professional Experience ### May 2023 - Jun 2026 Senior Lead Software Engineer (Principal Engineer scope) BrandAlley - London, UK - Served as the principal technical authority across interconnected business systems, leading continuous architectural evolution while maintaining uninterrupted live operations across warehouse, fulfilment, storefront, and financial platforms. - Architected, delivered and evolved the central Order Management System (OMS), acting as the operational coordination layer across inventory, purchasing, fulfilment, warehouse, storefront, and financial systems, enabling reliable cross-platform workflow orchestration and data interchange. - Led the architectural transformation of legacy systems into a modular, scalable platform architecture, enabling continuous modernisation while maintaining uninterrupted live operations. - Rebuilt and modernised the legacy Warehouse Management System (WMS), upgrading from PHP 5.6 to PHP 8.x and repurposing core functionality to support BrandAlley’s business model, significantly improving performance, maintainability, and reducing technical debt. - Designed and delivered warehouse operational tooling and workflow capabilities that contributed to productivity improvements of approximately 35–55% across fulfilment operations, improving efficiency. - Introduced AI-assisted engineering workflows across multiple enterprise codebases, by developing system-specific engineering blueprints, architectural references, implementation frameworks, and structured AI-assisted development standards to improve consistency, delivery efficiency, and code quality. - Established cross-functional delivery forums involving Engineering, Warehouse Operations, Customer Experience, and Finance stakeholders, improving communication, decision-making, and alignment across business-critical initiatives. - Identified and resolved critical operational risks, including inventory overselling, order duplication, and cross-system data inconsistencies, preventing fulfilment failures and financial loss. - Designed resilient operational infrastructure incorporating queue orchestration, automated recovery, observability, auditability, and fault-tolerant workflow execution across critical business systems. - Improved reliability and consistency of cross-system data flows, enabling accurate inventory management, order lifecycle orchestration, and operational visibility across business-critical platforms. ### Oct 2021 - Apr 2023 Lead Software Engineer Internet Fusion Group - London, UK - Led a cross-functional team of 7 across engineering, QA, and product, responsible for the delivery and evolution of bespoke warehouse logistics platforms supporting order management, inventory, and financial workflows. - Led the technical design and delivery of backend platform capabilities supporting order management, inventory control, reconciliation, reporting, and financial transaction workflows. - Improved platform performance, reliability, and scalability by optimising database architecture and resolving critical concurrency issues such as deadlocks across high-volume transactional systems. - Modernised legacy platforms through systematic refactoring and architectural improvements, improving maintainability, reducing technical debt, and increasing long-term system stability. - Established structured engineering and delivery practices across planning, estimation, development, testing, release, and deployment activities, improving delivery predictability, system reliability, and team effectiveness. ### Feb 2020 - Oct 2021 Lead Software Engineer 3ev (3rd Eye Vision) - Hove, UK - Led the technical design and delivery of backend platform capabilities for multiple client systems, supporting core business workflows and third-party integrations. - Modernised legacy platforms by upgrading from Laravel 4.2 (PHP 5.6) to Laravel 8 (PHP 8.0) and introducing SOLID design principles, improving maintainability, scalability, and long-term platform sustainability. - Designed and implemented logging, auditing, and notification capabilities, improving observability, traceability, and supporting reconciliation workflows across client platforms. - Led projects from conception to delivery, including technical design, planning, and estimation, ensuring successful implementation across client platforms. - Modernised infrastructure and deployment workflows by migrating systems from AWS to Google Cloud, reducing infrastructure costs, and establishing Docker-based local development environments. ### Nov 2016 - Dec 2019 Senior Software Engineer Tillo - Hove, UK - Designed and delivered backend services and APIs supporting financial transaction processing and gift card platforms, integrating with external partners and payment providers. - Developed secure transaction and integration workflows, ensuring adherence to industry-standard security practices. - Implemented reconciliation workflows and validation mechanisms, ensuring accuracy and integrity of financial transactions across partner integrations. - Delivered integrations with third-party systems, including SAP, supporting partner onboarding and enabling reliable data exchange across platforms. - Contributed to the evolution of the platform from early-stage product to stable production system, supporting increasing transaction volumes and expanding partner integrations. ### Jun 2016 - Nov 2016 Senior Software Engineer 22 Point Six - Burgess Hill, UK ### Jan 2013 - Nov 2015 Senior Full-Stack Web Developer Mosaic Digital - Brighton, UK ### Jul 2013 - Jan 2013 Freelance Software Engineer Thessaloniki, Greece ### Jul 2009 - Jun 2012 Full-Stack Software Engineer Tera Media - London, UK & Athens, Greece ### Oct 2006 - Jul 2009 Freelance Software Engineer Thessaloniki, Greece ### Apr 2006 - Oct 2006 Software Engineer (BSc Internship) Alexander Technological Educational Institute, Greece ### Mar 2004 - Apr 2006 Freelance Software Engineer Thessaloniki, Greece --- ## Military Service ### Sept 2011 - Jul 2012 Second Lieutenant (Reserve) - Head of the Research and Informatics Office 88 Military Command, Hellenic Army - Lemnos, Greece Served as Head of the Research and Informatics Office at 88 Military Command on the island of Lemnos. Led a team responsible for maintaining IT infrastructure across multiple military units and served as Brigade Communications Officer on a rotating basis. --- ## Technical Expertise ### Backend & Architecture PHP (5.0 - 8.4), Laravel (4.2 - 13), Symfony, Lumen, Zend REST APIs, distributed systems, synchronous/asynchronous integrations. Experience across monolithic and distributed architectures ### Frontend & Web JavaScript, AJAX, jQuery, HTML5, CSS3, SASS (SMACSS), Liquid, YAML, Markdown, JSON ### Data & Storage MySQL, PostgreSQL, SQLite High-volume transactional systems, data modelling, performance optimisation ### Infrastructure & DevOps AWS, Google Cloud, DigitalOcean, Docker, Vagrant, Linux CI/CD, deployment workflows, system observability ### Integrations & Platforms Financial systems, payment processing, ERP (Business Central, SAP) eCommerce platforms (Magento), third-party API integrations ### Engineering Practices System design, incremental delivery, resilience patterns, fallback mechanisms Code quality, testing strategies, secure development practices AI-assisted software engineering LLM-assisted architecture and implementation System-specific engineering standards and architectural documentation (Claude, Codex, ChatGPT) --- ## Education - **MSc Design and Digital Media** University of Edinburgh, UK - **BSc Informatics Engineering (Computer Science)** Alexander Technological Educational Institute of Thessaloniki, Greece - **Reserve Infantry Officers Academy** Signal Corps & Research and Informatics Corps Hellenic Armed Forces, Greece --- ## Professional Development Attended industry conferences including Laravel London, AWS London, and UX Brighton. --- ## Languages - English (Fluent) - Greek (Native) --- [Download Detailed CV (PDF)](https://www.dimitrishantzis.com/docs/Dimitrios_Chantzis_CV.pdf) [View Detailed CV (Markdown)](https://www.dimitrishantzis.com/markdown)