Open to opportunities

Ronan Sands

@ronansands

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Senior software engineer building reliable Java/.NET backend services and scalable microservices.

Canada

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What I'm looking for

I’m looking for a team that values reliability and maintainability—where I can own backend APIs, improve CI/CD and observability, and use AI-assisted tooling to reduce cycle time while collaborating cross-functionally.

I’m a Senior Software Engineer with 5+ years building Java/Spring Boot backend services and scalable microservice architectures. I ship production features end-to-end, taking ownership of API design, CI/CD validation, observability, and production support.

At Visa’s Token Management Service, I operate in a reactive client-response team supporting major tokenization customers under tight SLAs. I co-built Regression Detective, an AI-assisted failure-triage tool adopted by an engineering team of 50 and rolling out to additional repositories, cutting average test-failure investigation time from ~60 minutes to ~10 minutes.

I also deliver reliability and release readiness through security hardening and testing discipline. I drove security improvements via Checkmarx SAST/SCA dependency upgrades, closed dozens of critical/high findings ahead of production cut, shipped WCAG 2.1 AA accessibility remediations, and expanded Playwright E2E coverage to harden regression detection.

Earlier, at Payroc, I modernized legacy REST APIs into .NET Minimal APIs using Vertical Slice Architecture and improved developer velocity and testability. Before that, at PwC, I built UiPath and Python automation to accelerate audit/assurance workflows and created Google Apps Script solutions to automate tasks across Google Workspace.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Visa

Oct 2025 - Present (9 months)

Operate in a reactive client-response team supporting Visa tokenization customers, investigating production issues and delivering technical requests against tight SLAs. Co-built an AI-assisted failure-triage tool that reduced test-failure investigation time from ~60 minutes to ~10 minutes and led cross-repo partner access enablement for merchant Dashboard and Tokens screens.

Software Engineer

Visa

Oct 2023 - Sep 2025 (1 year 11 months)

Delivered 40+ production features and fixes across 9 microservices with end-to-end ownership from security assessment through testing, deployment coordination, and Splunk monitoring. Extended Java/Spring Boot REST APIs and React UIs, owned Jenkins CI/CD validation, and helped drive release-quality outcomes including zero rollbacks in owned repositories and 1–2 rollbacks over multiple years overall

React Java Spring Boot .NET RESTful APIs Microservices API Design CI CD Jenkins Git GitHub Bitbucket Unit Testing Acceptance Testing Splunk Security Assessments Dependency Upgrades NPM Registry Authentication

Software Engineer I

Payroc

Oct 2022 - Oct 2023 (1 year)

Refactored legacy REST APIs to .NET Minimal API using Vertical Slice Architecture to improve maintainability and separation of business logic. Built the merchant boarding service with BDD acceptance testing (SpecFlow) and Moq unit tests, plus SQL stored procedures to support CRUD and data integrity.

Minimal APIs Vertical Slice Architectures REST APIs Unit Testing Moq BDD SpecFlow Acceptance Testing SQL Stored Procedures CRUD Operations

Software Developer

PwC

Jun 2019 - Sep 2021 (2 years 3 months)

Developed automation solutions in UiPath and Python to support audit and assurance workflows, including automating a previously manual process to reduce audit independence check time by 50%. Implemented Google Apps Script solutions to automate tasks across Google Workspace.

Python Automation Google Apps Script Google Workspace

Token Usage Analytics Prototype

Visa

AI-built prototype application that generates insights from client tokenization patterns and is being adopted by a product team to identify upsell opportunities for existing clients.

Tokenization Pattern Insights

Regression Detective

Visa

AI-assisted tool that diagnoses test failures and suggests fixes, adopted by an engineering team of 50 in Visa’s Token Management Service and rolling out to additional repositories. Reduced average failure-triage time from 60 minutes to 10 minutes.

AI Assisted Failure Triage Developer Tooling

Partner Dashboard Enablement

Visa

Coordinated cross-repository changes in multiple languages to grant partner read-access to merchant Dashboard and Tokens screens. Removed a migration blocker for 10 enterprise resellers moving from the legacy platform to the Token Management Service.

Cross Repository Development

Education

Degrees, certifications, and relevant coursework

Queen's University Belfast

Bachelor of Engineering (BEng), Software Engineering with Digital Technology Partnership

2018 - 2022

Grade: First Class Honours

BEng in Software Engineering with Digital Technology Partnership at Queen's University Belfast through a PwC degree apprenticeship/work-based learning program. Graduated with First Class Honours.