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Mohammad Ehsan Ehrari

PROFILE

Mohammad Ehsan Ehrari

Ehsan Hararie engineered end-to-end candidate data, search, and workflow solutions for the Talent-Catalog/talentcatalog repository, delivering over 200 features in 16 months. He architected scalable backend services and APIs using Java, Spring Boot, and SQL, integrating Elasticsearch for advanced search and Angular for responsive UI flows. His work included robust data modeling, GDPR-compliant privacy features, and modular form systems supporting onboarding, travel, and refugee workflows. Ehsan emphasized test-driven development, CI/CD automation, and infrastructure-as-code with Terraform and Docker, ensuring reliability and maintainability. His contributions demonstrated depth in full-stack engineering, enabling rapid feature delivery and improved data integrity across the platform.

Overall Statistics

Feature vs Bugs

90%Features

Repository Contributions

670Total
Bugs
23
Commits
670
Features
212
Lines of code
91,965
Activity Months16

Work History

February 2026

31 Commits • 9 Features

Feb 1, 2026

February 2026 Monthly Summary for Talent-Catalog/talentcatalog: Key features delivered: - Gatling Performance Testing Framework (HTTP Protocol & Runner): Implemented HttpProtocolFactory and updated GatlingRunner to enable stable, scalable load testing across HTTP endpoints, providing repeatable performance metrics for capacity planning. - Postgres Load Testing and Performance Configuration: Introduced a Postgres load test harness with PerfConfig and PerfSettings to measure DB performance under realistic traffic and inform tuning efforts. - Authentication Framework for Tests: Added AuthChains and AuthRequests with updated chains to support realistic authenticated test scenarios and easier test composition. - Candidate Search API Integration: Set up candidate search data and request/payload structures to enable integration testing and performance validation. - Candidate Search Simulation Suite: Delivered a base simulation and multiple AB-test variants (parallel open/closed, sequential AB, random AB) with updated payloads to support feature validation under load. - Endpoint Loop Scenarios: Added NewEndpointLoopScenario and OldEndpointLoopScenario to validate endpoint looping behavior under load. - Core/Config and Build Updates: Updated HttpProtocolFactory, application.conf, and build.gradle.kts to support new simulations and configurations. - Default Simulation and Logging: Set the default Gatling simulation to SequentialAB and removed login logging to simplify runs and reduce exposure of sensitive data. - Gatling Runner Enhancements: Improved stability and compatibility with updated Gatling integration. Major bugs fixed: - Cleanup: Removed obsolete JavaDslSmokeTestSimulation to streamline the test suite. - Security/privacy improvement: Removed logging of login request bodies to prevent exposure of sensitive information during failed logins. Overall impact and accomplishments: - Significantly improved performance validation capabilities with a unified Gatling-based framework, enabling faster, more reliable capacity assessments and performance tuning. - Enabled realistic end-to-end testing for Candidate Search with robust AB testing scenarios, delivering actionable insights into feature performance and user experience under load. - Strengthened security and data handling in tests by removing sensitive logs and simplifying runs, contributing to safer CI pipelines and better governance. - Demonstrated end-to-end technical ownership across testing infrastructure, data payloads, simulations, and build/config management, driving measurable business value through faster release cycles and better performance visibility. Technologies/skills demonstrated: - Gatling, HTTP protocol testing, and GatlingRunner stability improvements - Postgres load testing and performance configuration (PerfConfig, PerfSettings) - Java/Scala and Gradle Kotlin DSL (build.gradle.kts) for test harness and configs - Test data modeling and payload design for Candidate Search - AB testing patterns (parallel/sequential/random) and simulation orchestration - Authentication test infrastructure (AuthChains, AuthRequests) and secure logging practices

January 2026

31 Commits • 12 Features

Jan 1, 2026

January 2026 monthly summary for Talent-Catalog/talentcatalog: Delivered core build, test-infra, and search infrastructure enhancements with cross-language support (Scala/Java) and readiness for performance testing. Key changes enable faster CI cycles, broader language coverage, and improved test coverage for data-intensive workloads.

December 2025

27 Commits • 9 Features

Dec 1, 2025

December 2025 performance summary for Talent-Catalog/talentcatalog. Delivered end-to-end improvements across frontend, backend, and data layer that enhance candidate data handling, search capabilities, and user experience. Key outcomes include UI/UX refresh of Candidate Task component; backend data model and search workflow extended to support richer candidate data and SavedSearch interactions; frontend search UI enhancements with a new candidate-number parser and improved form components; and foundational migrations and utilities that improve data integrity and maintainability. These efforts reduce time-to-information for recruiters, improve data accuracy for candidate records, and establish a scalable foundation for upcoming search features and form workflows. Technologies demonstrated include Angular/TypeScript UI, Java backend services with domain/model/service/repo patterns, SQL migrations, and utility libraries.

November 2025

5 Commits • 3 Features

Nov 1, 2025

November 2025: Delivered migrations and refactors to improve data integrity, translation stability, and maintainability in Talent-Catalog/talentcatalog. Implemented UI/data-cleaning migrations, standardized constants, and enum-based option handling to support reliable analytics and future feature work.

October 2025

17 Commits • 3 Features

Oct 1, 2025

October 2025 monthly summary for Talent-Catalog/talentcatalog: Delivered core features and data-model improvements that enable richer candidate profiling and compliance with refugee-status workflows, while tightening UI/data synchronization and improving content rendering quality. The work delivered directly supports faster, more accurate candidate processing, improved member data collection, and better reporting for hiring teams and program staff.

September 2025

90 Commits • 28 Features

Sep 1, 2025

September 2025 was marked by a comprehensive modernization of Talent Catalog with a strong emphasis on data contracts, governance, and scalable form workflows. Key backend/data-model work aligned with TermsInfo and DPA requirements, while frontend/UI improvements improved onboarding, admin capabilities, and user experience. Also stabilized deployments with environment config updates and routing/module enhancements to support faster delivery and governance compliance.

August 2025

48 Commits • 14 Features

Aug 1, 2025

In 2025-08 Talent-Catalog/talentcatalog delivered significant business and technical gains across candidate data modeling, search, UI, and reliability. This month focused on enabling privacy-aligned candidate data handling, strengthening search capabilities, enabling travel document workflows, and hardening QA and deployment processes. Highlights include updated candidate data model and search components with privacy policy integration; travel document migrations and upload task; backend search/indexing improvements with Elasticsearch; frontend UI refinements for search and registration; and strengthened test infrastructure, environment configuration, and CI/CD secrets.

July 2025

87 Commits • 27 Features

Jul 1, 2025

July 2025 delivered significant improvements in test coverage, data integrity, and CI/CD readiness for Talent-Catalog/talentcatalog. Key outcomes include expanded test coverage for auditing, candidate domain behavior, and model/API conversions; a robust DB integration testing framework; new repository integration tests; CI/CD and test container orchestration enhancements; and front-end/API refinements that improve data handling and user workflows. These efforts reduce regression risk, accelerate release confidence, and improve reliability of critical data and user-facing features.

June 2025

33 Commits • 15 Features

Jun 1, 2025

June 2025 - TalentCatalog backend delivered significant enhancements to user management, standardized candidate identifiers, and expanded portal API test coverage across multiple domains. Key improvements include robust User Admin API and UserService implementations, alignment of coupon service behavior, and a broad suite of portal API tests (Auth, Branding, Education, Language, Industry, Occupation, and more). A critical bug in UserServiceImpl was fixed to improve reliability, and the naming convention standardization reduces data confusion and integration risks. These efforts increase system reliability, accelerate time-to-market for admin features, and strengthen confidence in end-to-end portal workflows.

May 2025

47 Commits • 13 Features

May 1, 2025

May 2025 focused on stabilizing the Talent Catalog platform through migrations, infrastructure hygiene, API/UI improvements, and expanded test coverage. Delivered a critical database migration for survey type handling, refreshed dependencies and provider lockfiles, and enhanced testing across UI, backend, and security layers. These efforts improved data integrity, release reliability, and overall product quality, enabling safer delivery of upcoming features.

April 2025

47 Commits • 13 Features

Apr 1, 2025

April 2025 Monthly Summary for Talent-Catalog/talentcatalog Key outcomes: - Consolidated domain/API surface by implementing migration cleanup to remove the occupation field (V1_353) and updating related Candidate models, Es, and UI components; introduced subsequent V1_354 migration to update survey type where applicable. - Stabilized data model after a series of changes by reverting conflicting Candidate-related updates (Occupation, BuilderSelector, Admin/Portal APIs, Es, and Specifications) and aligning migration numbering (352 -> 351) to restore a clean baseline. - Infrastructure and build improvements, including build.gradle refinements, Karma/test configuration adjustments, and Terraform core module creation (computing, database, DNS, networking, main/config files) to support scalable deployment. - Improved deployment readiness with a staging merge into 1107-java-jpa-test to incorporate latest integration changes and ensure end-to-end validation. Major bugs fixed: - Reverts of destabilizing Candidate occupation-related updates and aligned APIs to a stable surface. - Migration numbering alignment (renaming 352 to 351) to prevent drift between changes and deployment scripts. - Removal of occupation-related migration rollback and education major field removal updates to maintain consistency across ES and specs. Overall impact and accomplishments: - Reduced technical debt in the Candidate domain and migration tooling, improving stability for production users and downstream services. - Enhanced deployment and testing capabilities with Terraform modules and CI-friendly build/config changes, enabling faster, safer iterations. - Clear documentation of changes via commit messages and versioned migrations to facilitate audits and onboarding. Technologies/skills demonstrated: - Java (CandidateSpecification.java, CandidateEs, AdminApi, PortalApi), SQL migrations, and ES mapping adjustments - Gradle-based build and dependency management - Karma/Jasmine test configuration and test setup adjustments - Terraform IaC: core modules (compute, database, dns, network, main/config), variable and deployment refinements - Code cleanup and refactoring to remove deprecated structuring and improve maintainability

March 2025

70 Commits • 20 Features

Mar 1, 2025

March 2025 highlights a comprehensive upgrade of coupon, candidate, and UI workflows in Talent-Catalog/talentcatalog, spanning backend, frontend, and data migrations. Key features delivered include the Duolingo Coupon Admin API and service (updated API, service interface/impl, and tests) and the Coupon Backend API, repository, and admin endpoints (plus related DuolingoCoupon model and tests). Frontend work delivered Coupon UI refinements, Admin service/import UI enhancements, main app UI updates, and candidate/task view improvements, improving usability and operational efficiency. Database migrations were cleaned up and extended from V1_343 through V1_348, removing legacy fields and updating language mappings to support new locales. Major bugs fixed include Angular test stability improvements and unit-test fixes, along with a naming correction for TaskAssignmentServiceImpl wiring. Technologies demonstrated: Java/Spring service and repository layers, TypeScript/Angular UI work, SQL migrations and data modeling, and end-to-end testing. Business value: faster feature delivery, cleaner data schema, and more reliable coupon and candidate workflows.

February 2025

35 Commits • 12 Features

Feb 1, 2025

February 2025 (2025-02) focused on delivering business-critical coupon capabilities, strengthening search/indexing, expanding data model, and cleaning architecture for reliability and scalability. Key outcomes include: implemented coupon persistence layer, service interfaces/implementations, and comprehensive unit tests; enhanced candidate indexing with ES mappings and builder selector; added a new DuolingoExtraFields module with entity, repository, service and database migrations; improved reliability through error handling enhancements and modularization (task reallocation, removal of unused dependencies); and integrated admin/exam service improvements along with frontend translations to improve user experience. These changes enable a scalable coupon program, faster candidate lookups, and more robust admin workflows, reducing maintenance cost and supporting growth.

January 2025

31 Commits • 8 Features

Jan 1, 2025

January 2025 monthly summary for Talent-Catalog/talentcatalog focusing on API contract stabilization, UI/UX improvements, and test coverage expansion. Key outcomes include naming convention alignment across API and UI, enhanced test coverage for services and configuration, and data model updates that simplify candidate handling and builder flow. The month also delivered dashboard API updates and an admin coupon test to improve end-to-end validation and governance. Branding assets were added to support UI consistency.

December 2024

36 Commits • 15 Features

Dec 1, 2024

December 2024 performance summary for Talent-Catalog/talentcatalog: Delivered end-to-end Duolingo feature set and platform enhancements, delivering business value through coupon promotions, improved analytics contracts, admin capabilities, and deployment/config improvements. Focused on delivering measurable outcomes with tests, migrations, and UI wiring to enable production readiness and scale.

November 2024

35 Commits • 11 Features

Nov 1, 2024

November 2024: Delivered end-to-end Duolingo Coupons capability in Talent-Catalog/talentcatalog, modernizing the codebase with Jakarta EE namespace migration and robust database migrations, while updating UI components for admin/candidate portals and performing targeted cleanup to reduce technical debt.

Activity

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Quality Metrics

Correctness91.0%
Maintainability91.0%
Architecture87.4%
Performance88.0%
AI Usage21.2%

Skills & Technologies

Programming Languages

AngularBashCSSGradleGroovyHCLHOCONHTMLJSONJava

Technical Skills

ALBAPI ConfigurationAPI DevelopmentAPI IntegrationAPI Response ModelingAPI TestingAPI developmentAPI testingAWSAccess ControlAngularAngular TestingBackend DevelopmentBuild AutomationBuild Management

Repositories Contributed To

1 repo

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

Talent-Catalog/talentcatalog

Nov 2024 Feb 2026
16 Months active

Languages Used

JavaSQLTypeScriptHTMLJavaScriptSCSSYAMLCSS

Technical Skills

API DevelopmentAngularBackend DevelopmentCSV ParsingDatabaseDatabase Interaction