
Naglis Ruksnaitis developed and enhanced backend APIs across several HMRC repositories, focusing on robust data validation and maintainable architecture. In the self-employment-business-api, he delivered a new OpenAPI endpoint for cumulative period summaries, consolidating retrieval and amendment operations to streamline client integration. For the individuals-capital-gains-income-api, he centralized shared code by migrating configuration, controllers, and services into the main application, reducing duplication and improving maintainability. In the individual-losses-api, he implemented tax year validation for Brought Forward losses, ensuring data integrity through path parameter validation. His work demonstrated expertise in Scala, Play Framework, API design, and configuration management.

February 2025: Delivered BF Losses Tax Year Validation for hmrc/individual-losses-api. Added API-level validation to ensure the tax year is valid when creating Brought Forward (BF) losses, with the tax year now passed as a path parameter to strengthen data integrity and prevent incorrect loss calculations. The work was completed with a focused change set and traceable commits (MTDSA-28798: 'Create BF Loss Tax Year validation' — 2226c5815a3a178cdbecd35e66f172e010bafcd4).
February 2025: Delivered BF Losses Tax Year Validation for hmrc/individual-losses-api. Added API-level validation to ensure the tax year is valid when creating Brought Forward (BF) losses, with the tax year now passed as a path parameter to strengthen data integrity and prevent incorrect loss calculations. The work was completed with a focused change set and traceable commits (MTDSA-28798: 'Create BF Loss Tax Year validation' — 2226c5815a3a178cdbecd35e66f172e010bafcd4).
Month: 2024-12 — Focused on architectural consolidation for the HMRC Individuals Capital Gains Income API. Delivered a centralized shared code base by migrating shared functionality from the common module into the main application, centralizing configuration, connectors, controllers, models, routing, services, and utilities. This reduces duplication, improves maintainability, and sets the stage for faster onboarding and future feature delivery. Commit 96d46193846402bb8f9d0ce38d389eea6367142c (MTDSA-28021 Copy Shared code (#38)).
Month: 2024-12 — Focused on architectural consolidation for the HMRC Individuals Capital Gains Income API. Delivered a centralized shared code base by migrating shared functionality from the common module into the main application, centralizing configuration, connectors, controllers, models, routing, services, and utilities. This reduces duplication, improves maintainability, and sets the stage for faster onboarding and future feature delivery. Commit 96d46193846402bb8f9d0ce38d389eea6367142c (MTDSA-28021 Copy Shared code (#38)).
October 2024 monthly summary: Delivered a new OpenAPI endpoint for cumulative period summaries for self-employment in the hmrc/self-employment-business-api. Added the endpoint to create and amend cumulative period summaries, updated routing configurations, and renamed YAML files to reflect the new functionality. Consolidated retrieval and creation/amendment under a single OpenAPI definition, enabling streamlined client integration and improved maintainability. This work supports faster feature delivery and better self-employment reporting.
October 2024 monthly summary: Delivered a new OpenAPI endpoint for cumulative period summaries for self-employment in the hmrc/self-employment-business-api. Added the endpoint to create and amend cumulative period summaries, updated routing configurations, and renamed YAML files to reflect the new functionality. Consolidated retrieval and creation/amendment under a single OpenAPI definition, enabling streamlined client integration and improved maintainability. This work supports faster feature delivery and better self-employment reporting.
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