Leo Caseiro — Senior Software Engineer

I am a Senior Software Engineer specialising in JavaScript and TypeScript, with a strong focus on building and maintaining scalable, high-performance web applications. My core expertise is in Frontend development, but I am never afraid to step out of my comfort zone. I have experience with Node.js and have successfully contributed to Java and Python codebases by leveraging AI-powered development tools. My current professional goals are to continue evolving into a more well-rounded full-stack engineer and to further improve my skills as a "Context Engineer", utilising AI to accelerate learning, navigate unfamiliar code, and deliver cross-stack solutions. My day-to-day involves architecting within large-scale codebases and complex monorepos, ensuring reliability, accessibility, and an excellent developer experience. Beyond product development, I have strong experience setting up and optimising CI/CD pipelines to ensure smooth deployments. Recently, my focus has also expanded to implementing cutting-edge AI features, leveraging generative AI and LLMs to build intelligent product experiences. Although my focus has shifted more towards enterprise development in recent years, I still maintain some contributions to the open-source community. You can find my past and present work on my GitHub profile (https://github.com/leocaseiro).

Stackforce AI infers this person is a SaaS-focused Fullstack Engineer with strong expertise in AI-driven solutions and accessibility.

Location: Central Coast, New South Wales, Australia

Experience: 18 yrs 4 mos

Skills

React.js
Graphql
Typescript
Reliability
Test Automation
Node.js
Accessibility

Career Highlights

Led AI integration in Jira, enhancing user experience.
Boosted performance of key Jira features by 50%.
Championed accessibility initiatives across multiple projects.

Work Experience

Atlassian

Senior Software Engineer (Jira AI) (1 yr 6 mos)

Frontend Software Engineer (Jira AI) (8 mos)

Frontend Software Engineer (Issue View) (2 yrs 7 mos)

Frontend Software Engineer (Jira Frontend Platform) (1 yr 1 mo)

Commonwealth Bank

Senior Software Engineer (1 yr 10 mos)

ReNet.com.au

Full Stack Developer (2 yrs 11 mos)

Independent Digital Media

Full Stack Developer (1 yr 1 mo)

TH2 Digital Agency

Lead Web Developer (2 yrs)

Tag'nClick

Lead Web Developer (1 yr 7 mos)

Loadcom

Lead Web Developer (11 mos)

AdBusiness

Junior Web Developer (2 yrs 2 mos)

Education

Diploma at Wells International College (formerly Windsor Institute of Commerce)

Associate's Degree at Centro Universitário Senac

Certificate IV at Colegio Vectra

Leo Caseiro

Senior Software Engineer

Central Coast, New South Wales, Australia18 yrs 4 mos experience

Highly Stable

Key Highlights

Led AI integration in Jira, enhancing user experience.
Boosted performance of key Jira features by 50%.
Championed accessibility initiatives across multiple projects.

Stackforce AI infers this person is a SaaS-focused Fullstack Engineer with strong expertise in AI-driven solutions and accessibility.

Contact

Skills

Core Skills

React.jsGraphqlTypescriptReliabilityTest AutomationNode.jsAccessibility

Other Skills

Relay FragmentsFeature LeadPerformance ImprovementContinuous Integration and Continuous Delivery (CI/CD)Koa.jsRedux.jsAngularJSScrumWeb AccessibilityPerformance MonitoringjQueryCSSHTMLHTML 5XHTML

About

Experience

18 yrs 4 mos

Total Experience

2 yrs 3 mos

Average Tenure

Current Experience

Atlassian

4 roles

Senior Software Engineer (Jira AI)

Promoted

Sep 2024 – Mar 2026 · 1 yr 6 mos

Co-led the Jira Orchestration initiative for AI Agents in Jira (https://www.atlassian.com/blog/announcements/ai-agents-in-jira), directing a team of 4 to integrate AI Agent avatars, while serving as a key investigator for platform-wide agents' assignability.
Technical Leadership: Collaborated with 15+ teams to plan and execute a complex architecture involving REST, GraphQL (Apollo/Relay), and multiple frontend components.
Product Launch: Orchestrated the rollout strategy from a live demo at Team EU 2025 to Open Beta, providing rapid technical support for Early Adopters.
Cross-Functional Impact: Partnered closely with Product and Design to ensure high standards for UX and accessibility.

React.jsGraphQLRelay FragmentsFeature Lead

Frontend Software Engineer (Jira AI)

Jan 2024 – Sep 2024 · 8 mos

Feature Leadership: Led the "Create Jira work item in Confluence" feature for Jira AI, leveraging generative AI to streamline issue creation.
Widget Architecture: Architected a reusable GIC (Global Issue Create) widget, embedding Jira's creation flow across Confluence and AI Rovo Chat, later used in Trello, Loom, and other Atlassian products.
Performance Optimization: Boosted GIC widget performance by 50% via asynchronous loading and background AI generation of issue summary, description.
Core Infrastructure: Exposed a critical ADF-to-Markdown parsing service leveraged by multiple Atlassian services for LLM communication.

Performance ImprovementReact.jsTypeScript

Frontend Software Engineer (Issue View)

Jun 2021 – Jan 2024 · 2 yrs 7 mos

I played a pivotal role in enhancing the reliability of the Issue View and improving test coverage for the Jira Issue View team.
Reliability & Quality: Contributed to Issue View test coverage from 40% to 80% and reduced CI flakiness. Developed custom AST (ESLint) rules to enforce testing and feature flag best practices across Jira's pipelines, eventually transitioning reliability management of the Issue View to a new team based in India.
Performance & UX: Led the frontend integration of comment and worklog limits, optimizing Issue View performance and user experience. (https://community.atlassian.com/forums/Jira-articles/Upcoming-changes-Introducing-per-issue-limits-for-list-fields-in/ba-p/2468177)
Developer Experience (Innovation): Led a team of 4 to build a PR Review Slackbot. Still widely used across Atlassian in 2026, the bot significantly reduces PR cycle times company-wide by notifying engineers of review statuses.
Accessibility (A11Y) Champion: Selected for a 3-month secondment to the Jira A11Y team (Jan-Mar 2023) after advocating for accessibility in the team, and Atlassian. Championed screen-reader accessibility for the Issue View sidebar, collaborating closely with design and engineering to elevate inclusive UX standards.

React.jsReliabilityTest AutomationContinuous Integration and Continuous Delivery (CI/CD)

Frontend Software Engineer (Jira Frontend Platform)

May 2020 – Jun 2021 · 1 yr 1 mo

Performance Optimization: Enhanced Jira's first load and SSR performance by implementing lazy loading with React Loosely Lazy (https://github.com/atlassian-labs/react-loosely-lazy), improving data fetching via React Resource Router (https://github.com/atlassian-labs/react-resource-router), and optimizing bundle loading in Jira SSR by utilising script defer and async. Verified gains via SignalFx and Splunk.
Developer Experience (Innovation): Developed the first automated onboarding script for Jira FE using Node.js and shell scripts (./healtcheck.sh and yarn onboarding). This tool has been maintained by platform teams for over 6 years and used by 2000+ engineers.

React.jsNode.jsKoa.jsPerformance ImprovementRedux.js

Commonwealth bank

Senior Software Engineer

Jul 2018 – May 2020 · 1 yr 10 mos · Greater Sydney Area

I've been working in the agile scrum team building and maintaining the online application for Personal Loan on the Netbank. The stack I currently use at CBA is React in TypeScript with Redux, Redux Saga. We deploy our applications in the cloud (AWS/Azure) via Team City pipeline.
To build applications for a large scale in an organization such a CBA, I make sure we delivery reliable components that are fully accessible for screen readers and optimized.
I often present at meetups internally and outside CBA.

AccessibilityReact.jsRedux.jsAngularJSScrum

Renet.com.au

Full Stack Developer

Jul 2015 – Jun 2018 · 2 yrs 11 mos · Greater Sydney Area

ReNet provides software for over a thousand real estate agencies across Australia and New Zealand. The main services they provide are http://homehound.com.au and Renet's Touchpoints Manager (CRM).
Highlights:
Frontend Leader, stack with Angular, TypeScript, ES6+, SASS and PostCSS with Material Design;
Implemented the continuous integration (CI) through Gitlab using Docker and Gulp/Webpack;
Designed and developed the iOS and Android mobile app with NativeScript, Angular and Material Design;
Developed and maintained multiple applications sharing the same code using Angular CLI

Independent digital media

Full Stack Developer

Jun 2014 – Jul 2015 · 1 yr 1 mo · Greater Sydney Area

As a member of the team, I developed new features and maintained the business websites for the lifestyle media company: Homehound, The Knot and PRIMPED.
Highlights:
Billing integration for online payments through eWAY, generating more subscriptions;
Created a newsletter tool that integrates multiple MailChimp templates into the WordPress CMS automatically with an interactive tool;
Enhanced the search for HomeHound using Google Maps as a tool to allow users to search for listings in geographical locations that are in the map view for mobile and desktop;
Improved mobile responsiveness using CSS3 and Bootstrap.

Th2 digital agency

Lead Web Developer

Jun 2012 – Jun 2014 · 2 yrs · Greater Sydney Area

Development and maintenance of blogs, websites;
Database design and modelling;
Development and integration of APIs (Facebook, YouTube, Twitter, Instagram, Google Maps, REST);
Search engine optimisation (SEO) for websites and blogs.

Tag'nclick

Lead Web Developer

Nov 2010 – Jun 2012 · 1 yr 7 mos · Greater São Paulo Area

Team leader of the front-end and back-end developers (4 team members);
Development and maintenance of blogs, websites, portals and online campaigns;
Building and maintaining Content Management Systems (CMS) in PHP CodeIgniter;
Creating and maintaining WordPress templates and plugins;
API Integration (Facebook, YouTube, Twitter, Instagram, Google Maps);
Development and maintenance of E-commerce websites;
Brands and clients: Brasif, Lunna Magazine, Oficina de Estilo, Olympus, TAM, Toda Teen Magazine.

Loadcom

Lead Web Developer

Jun 2009 – May 2010 · 11 mos · Greater São Paulo Area

Team leader of the front-end and back-end developers (3 team members);
Building and maintaining Content Management Systems (CMS) in PHP Zend Framework;
Creating and maintaining WordPress templates and plugins;
Development and maintenance of websites, blogs, portals and news websites;
Search engine optimization (SEO) for websites and blogs.
Brands and clients: AON, Brahma (beer), Hera Investimentos (financial investment bank),
Pioneer, Prudence and Whiskas.

Adbusiness

Junior Web Developer

Apr 2007 – Jun 2009 · 2 yrs 2 mos · Greater São Paulo Area

Development and maintenance of websites, blogs, portals and news websites;
Development and maintenance of E-commerce;
Building and maintaining Content Management Systems (CMS) in OOP PHP and Prototype JavaScript;
Creating and maintaining WordPress templates and plugins.
Clients: Band TV Channel, Interep, Nokia, TAM Airlines, Verisign.