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MJANOWICZ

PROFILE

Mjanowicz

Over five months, contributed to multiple HMRC repositories, notably ngr-property-linking-frontend and ngr-login-register-frontend, delivering features that improved user experience, data integrity, and system reliability. Developed session timeout management with configurable keep-alive logic, enforced file upload size validation, and implemented idempotent backend flows to prevent duplicate submissions. Enhanced frontend UX through copy refinements and streamlined user actions, while integrating services like NgrNotify for access control. Leveraged Scala, Play Framework, and Typescript, applying repository patterns, configuration management, and automated testing with Selenium. Work demonstrated a focus on maintainable, testable code and cross-repo alignment with evolving product and security requirements.

Overall Statistics

Feature vs Bugs

91%Features

Repository Contributions

15Total
Bugs
1
Commits
15
Features
10
Lines of code
1,269
Activity Months5

Your Network

4 people

Work History

January 2026

2 Commits • 1 Features

Jan 1, 2026

January 2026 monthly summary for hmrc/ngr-property-linking-frontend focused on delivering secure, configurable session management with UI improvements. The work centered on a robust User Session Timeout Management feature using a KeepAliveController to manage keep-alive requests and config-driven timeout behavior, complemented by a UI countdown timer refinement to reduce user disruption while maintaining security.

November 2025

5 Commits • 4 Features

Nov 1, 2025

November 2025: Delivered a focused set of user-facing features and reliability improvements in hmrc/ngr-ui-tests, emphasizing property management workflows, UI interactions, and financials capture. Key work includes a new property search sorting feature, enhanced property linking with business rates uploads, a Submission Confirmation Page for post-submission feedback, and a Lease Financials module to record money received and renewal payments. A local data handling fix in property linking stabilized end-to-end flows, accompanied by expanded test coverage. These efforts improve user experience, data accuracy, and onboarding velocity, directly supporting faster decision-making and reduced post-submission support.

October 2025

2 Commits • 1 Features

Oct 1, 2025

October 2025: Implemented idempotent flows in hmrc/ngr-property-linking-frontend to prevent duplicate submissions and linking actions. Key work includes: (1) Redirecting to the dashboard when a declaration reference number has already been generated to avoid showing the declaration form to users who completed the process; (2) Introducing PropertyLinkCheckAction to verify existing property linking requests via PropertyLinkingRepo and redirect to the dashboard if a duplicate is detected. These changes improve data integrity, reduce user friction, and align with NGR-2631 objectives. Technologies demonstrated: backend controller adjustments, new action pattern, repository checks, and clear commit traceability (NGR-2631).

September 2025

4 Commits • 2 Features

Sep 1, 2025

September 2025 highlights two high-value frontend deliveries across two repos, with strong testing and deployment readiness. Key feature: NgrNotify integration for private beta access in hmrc/ngr-login-register-frontend, implemented via a new connector, configured ngr-notify service, and added unit tests; includes stabilizing port configuration and improved error handling to ensure correct deployment behavior. Key feature: 10KB minimum file size enforcement for uploads in hmrc/ngr-property-linking-frontend, updating the UpscanInitiateRequest model and UX messages to provide clear feedback when below threshold. Major fixes and stabilizations include addressing port/config error handling (NGR-2953) and completing code reviews.

July 2025

2 Commits • 2 Features

Jul 1, 2025

In July 2025, delivered UX refinements and flow simplifications across two frontend repos, focusing on clarity, consistency, and streamlined user actions. No major defects fixed during the month; efforts were directed at improving user-facing messaging and interaction flow in alignment with product goals (NGR-2149, NGR-2150).

Activity

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Quality Metrics

Correctness92.0%
Maintainability90.0%
Architecture88.6%
Performance86.6%
AI Usage21.4%

Skills & Technologies

Programming Languages

HOCONHTMLJavaPropertiesScalaTypescript

Technical Skills

API IntegrationAction CompositionAuthenticationBackend DevelopmentConfiguration ManagementFrontend DevelopmentPlay FrameworkRepository PatternScalaSeleniumTest AutomationUI TestingUI testingUI/UX RefinementUnit Testing

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

hmrc/ngr-property-linking-frontend

Jul 2025 Jan 2026
4 Months active

Languages Used

PropertiesScalaJavaHOCONHTML

Technical Skills

Configuration ManagementFrontend DevelopmentUnit TestingBackend DevelopmentPlay FrameworkScala

hmrc/ngr-ui-tests

Nov 2025 Nov 2025
1 Month active

Languages Used

Scala

Technical Skills

ScalaSeleniumTest AutomationUI TestingUI testingtesting

hmrc/ngr-login-register-frontend

Jul 2025 Sep 2025
2 Months active

Languages Used

ScalaJavaTypescript

Technical Skills

Frontend DevelopmentUI/UX RefinementAPI IntegrationBackend DevelopmentConfiguration ManagementUnit Testing