Dan Marshall

Senior full-stack engineer with 11+ years of delivering enterprise .NET and JVM systems. Deep expertise in microservices, event-driven architecture, production AI integration, AI-assisted delivery systems, and developer tooling. Strong advocate for TDD, pair programming, and collaborative engineering practices that improve code quality and team velocity.

B.Sc. Mathematics and Computer Science — University of South Africa (UNISA)

danmarshall909@gmail.com · github.com/DanMarshall909 · linkedin.com/in/developerdan

One-page resume available for a concise PDF-friendly version.

Selected public projects are available as a short portfolio reference for technical reviewers.

Skills

Back-end Development

AI/ML Integration

Front-end Development

General

Recent Projects and Achievements

• Built an AI-assisted delivery system around Claude Code/Codex: reusable skills, project memory, PRD backlog management, TDD execution, mutation testing, Jira/Bitbucket workflow automation, and post-session reflection.
• Built a Roslyn-based C# refactoring CLI for semantic solution-wide rename, move, reference lookup, dependency analysis, duplicate detection, and safe refactoring across legacy ProjectX solutions.
• Drove technical analysis for a pre-launch tour booking platform, including Hero API source-of-truth decisions, PII minimisation, Stripe/Hero payment flow diagnosis, EF migration constraints, and Jira/PR delivery workflow.
• Built an AI-assisted publishing workflow for this Astro blog that drafts articles, generates local illustrations, opens browser previews, publishes to GitHub Pages, and prepares LinkedIn posts from a single command.
• Published technical write-ups on local LLM inference, Claude Code/MCP context optimisation, AI workflow design, and financial rounding correctness.
• Created a Windows setup guide and installer script for running a Bonsai 8B 1-bit LLM locally with CUDA and an OpenAI-compatible API.
• Improved this site with AVIF/WebP image generation, deferred font loading, Shiki syntax highlighting, RSS support, and Playwright coverage for meta descriptions.

Employment

Independent / Contract — AI-assisted software delivery and platform engineering

Senior Software Engineer / AI Workflow Engineer | March 2026 – Present

• Built and maintained a personal AI engineering system using Claude Code and Codex skills, project memory, reusable agents, and scripted workflows to keep delivery scoped, test-led, and auditable.
• Created PRD backlog automation for story intake, acceptance criteria expansion, execution tracking, completion, parking, and visualisation.
• Developed a Roslyn-powered C# refactoring CLI to support semantic rename, move, reference lookup, structural analysis, and safe cross-project refactoring in complex .NET solutions.
• Led technical delivery and risk reduction for a pre-launch tour booking platform, including Hero API integration strategy, PII minimisation, Stripe payment reconciliation, Azure image storage decisions, and Jira/Bitbucket workflow.
• Formalised TDD, mutation testing, code review, and refactoring workflows into reusable skills and agents for consistent AI-assisted engineering.

Reapit — reapit.com

Senior AI Engineer | September 2025 – February 2026

• Workshopped, built, and deployed an AI-driven property inspection system using AWS Bedrock, generating structured assessment reports constrained by business rules.
• Forked the LangChain4j framework to add Bedrock guardrail support when unavailable upstream. Modular architecture enabled a seamless swap to the official implementation within one day when released.
• Optimised LLM costs through strategic model selection balancing accuracy, features, performance, and token usage.
• Advised cross-functional teams on practical AI use cases.
• Self-directed adoption of the Kotlin/Spring Boot/AWS ecosystem, delivering production features while supporting the team with JVM implementation patterns.

RACT (Royal Automobile Club of Tasmania) — ract.com.au

Senior Software Engineer – Back-end | June 2024 – July 2025

• Applied Clean Architecture and DDD to enhance testability, scalability, and code clarity.
• Involved in pilot program to develop AI coding rulesets and best practices.
• Migrated and modernised core components from .NET Framework 4.7.2 to .NET 9.
• Built resilient microservices using MassTransit, WebAPI, GraphQL, and SQL Server.
• Collaborated with cross-functional teams to deliver scalable, well-tested features aligned with business requirements.

National Grower Register — ngr.com.au

Senior Full-Stack Engineer | November 2023 – May 2024

• Co-developed a modular online form solution (Flexidocs) using Clean Architecture and DDD, replacing an outdated system.
• Designed modern functional React 18 components with TypeScript and Tailwind CSS.
• Provided guidance on C# programming, OOP, AI tools, and testing best practices.
• Researched and selected sustainable technologies to support long-term goals.
• Improved legacy code with unit test coverage, enabling safe refactoring.
• Contributed to technical documentation and Agile processes.
• Mentored junior staff.

CloudMonitor — cloudmonitor.ai

Lead Azure / Back-end Engineer | June 2023 – November 2023

• Conceptualised, developed, and maintained features running on a serverless platform.
• Promoted TDD, SOLID principles, Clean Architecture, and peer programming.
• Introduced Agile processes, leading morning standups and mentoring junior developers.
• Azure DevOps pipeline maintenance and troubleshooting.
• Introduced Entity Framework, OpenAPI, xUnit, and JetBrains Rider.
• Presented company-wide tech talks and engaged with external stakeholders.

VALD — vald.com

Software Engineer – Back-end | January 2023 – May 2023

• Maintained, refactored, and contributed to various legacy REST APIs and microservices.
• Contributed to the integration testing framework.
• Promoted TDD and peer programming.
• Chaired and contributed to various Agile ceremonies.

Situ Systems — situsystems.com

Senior Software Engineer – Full-Stack | November 2021 – October 2022

• Authored numerous front-end and back-end features.
• Substantially increased test coverage and improved testing methodologies.
• Tuned SQL queries, dramatically improving performance in critical reports.
• Used Pulumi to automate deployment of infrastructure.
• Implemented CI workflows in Azure DevOps.
• Contributed to internal development tools.

HUB24 Limited — hub24.com.au

Data and Full-Stack Engineer | December 2019 – November 2021

• Authored a sophisticated and successful system for cleaning, transforming, and validating fund transfers between superannuation funds.
• Maintained strong working relationships with DBAs, architects, BAs, clients (e.g. Bank of New York), and senior management.
• Provided emergency on-call support across the organisation and managed client infrastructure, triaging and fixing or escalating issues to meet strict SLAs.
• Updated legacy web applications to deploy using Azure Pipelines.
• Championed TDD and automated integration testing.
• Authored, maintained, and supported numerous APIs and ETL projects.

Chandler Personalised Communications — chandler.com.au

Data and Full-Stack Engineer | March 2016 – December 2019

• Worked within an ISO 27001 certified organisation meeting strict security standards.
• Built and maintained web applications servicing government, public utility, and financial sectors.
• Web design using ASP.NET, Bootstrap, CSS, jQuery, and JavaScript.
• Database design in Azure SQL Server.
• Authored SSIS ETL packages to cleanse and process superannuation member data for web, print, and email campaigns.
• Liaised with technical and non-technical stakeholders to develop bespoke solutions.

WorldSmart POS Solutions — worldsmart.com.au

Software Engineer, QA and Support | February 2011 – February 2016

• Developed and maintained enterprise software for retail groups.
• Integrated financial, CRM, and stock modules with MYOB.
• Provided QA via automated scripting and manual testing.
• Authored technical and end-user documentation and provided internal training.
• Maintained internal support utilities and automated scripts.
• Installed and supported Point of Sale hardware and software.

References

Available on request.

“Dan is an absolute pleasure to work with and I would highly recommend him for any full-stack web development position. We worked together for just under a year and during that time Dan was always friendly, professional and went above and beyond when implementing code and designing systems. He has a keen eye for where things can be improved and is always looking to find the optimal solution to any problem he faces. He writes clean, well-structured code that is easy to maintain. He takes advice and constructive criticism well and brings a positive attitude to every meeting. Dan would be an invaluable addition to any software team.”

— Alistair Doulin, CTO, Situ Systems Pty Ltd