Youstina Zakrea - Backend Developer

Overview

Backend .NET developer focused on ASP.NET Core APIs with a junior-to-middle level of experience and a strength in implementing EF Core schema and basic auth flows. The strongest proven artifact is the EF Core migration chain (for example onine.Repository/Data/Migrations/20260709051900_AddProductTables.cs and onine.Repository/Identity/Migrations/20260811221704_Identity.cs) showing schema evolution and Identity integration. Public code does not demonstrate production-grade observability, documented resilience patterns (retries/circuit breakers), load testing, or extensive hand-tuned database optimizations.

Phone

Timeline

Back-End Developer Trainee · Junior

Instant Software Solutions · Full-Time

Aug 2026 to Sep 2026 1 Month Cairo In office

Built RESTful APIs using ASP.NET Core and C#. Used Entity Framework Core with SQL Server to implement database operations and data access. Applied Repository and Specification patterns to structure backend querying and filtering logic. Gained hands-on exposure to ERP-related backend workflows.

ASP.NET Core

C#

Entity Framework Core

SQL

Rest API

Front-End Developer Trainee · Junior

Instant Software Solutions · Full-Time

May 2025 to Jun 2025 1 Month Cairo In office

Developed responsive web interfaces using HTML, CSS, JavaScript, and Bootstrap. Built dynamic UI features with Angular and created reusable components for the front-end. Implemented responsive layouts for practical project requirements. Worked on front-end tasks through a series of guided development activities.

JavaScript

Angular

Bootstrap

Arab Open University

Bachelor's Degree · Computer Science

Cairo, Egypt

Projects

E-Commerce Web API

Jul 2026 to Jul 2026 0 Months

Developed an e-commerce RESTful API with ASP.NET Core and C#, using Entity Framework Core and SQL Server for persistence. Implemented Repository and Specification patterns to support flexible data filtering, sorting, and pagination. Added authentication and authorization via ASP.NET Core Identity and used Redis for caching.

SkinCare Advisor

Feb 2026 to May 2026 3 Months

Built a full-stack skincare recommendation web application using Angular for the UI and ASP.NET Core for the backend. Implemented RESTful APIs that generate personalized skincare routines and product suggestions based on user profile inputs such as skin type and budget. Included recommendation logic, authentication, product management, and an admin dashboard.

Restaurant CRUD System

Aug 2025 to Aug 2025 0 Months

Created a responsive restaurant management CRUD interface using HTML, CSS, and JavaScript. Implemented create, read, update, and delete operations through an interactive front-end experience. Focused on usable UI behaviors for managing restaurant data.

Technical skills

JavaScript

TypeScript

C#

Python

SQL

C#

ASP.NET Core

Entity Framework Core

AutoMapper

Frontend

Angular

Bootstrap

Tailwind CSS

PostCSS

autoprefixer

DevOps

Rest API

GitHub

Git

QA

Postman

Swagger

Databases

Redis

Middle Backend Developer Confidence: Low API Engineer

Backend .NET developer focused on ASP.NET Core APIs with a junior-to-middle level of experience and a strength in implementing EF Core schema and basic auth flows. The strongest proven artifact is the EF Core migration chain (for example onine.Repository/Data/Migrations/20260709051900_AddProductTables.cs and onine.Repository/Identity/Migrations/20260811221704_Identity.cs) showing schema evolution and Identity integration. Public code does not demonstrate production-grade observability, documented resilience patterns (retries/circuit breakers), load testing, or extensive hand-tuned database optimizations.

API Design

3/10

How well APIs are designed

Minimal API design signals exist (pagination and base/error controllers present) but no clear versioning, idempotency, or explicit error contract examples in the human-authored code provided.

Evidence

onineproject/Helpers/Pagination.cs

onineproject/Controllers/ApiBaseController.cs

onineproject/Controllers/ErrorController.cs

Data Layer & Database

4/10

Working with databases

Concrete EF Core migration history and model snapshots show schema evolution and DB mapping awareness, but most migration code is auto-generated and there is limited hand-tuned SQL or transaction/isolation logic visible.

Evidence

onine.Repository/Data/Migrations/20260709051900_AddProductTables.cs

onine.Repository/Data/Migrations/20260707072758_InitialCreate.cs

onine.Repository/Data/OnineContext.cs

Scalability & Performance

2/10

Handling load and speed

Little evidence of deliberate scalability or performance work; no caching invalidation, measured optimizations, or queue-based decoupling present in the human-authored files.

Evidence

onineproject/Helpers/ProductpictureurlResolver.cs

onine.Repository/Data/OnineContext.cs

System Architecture

3/10

Overall system structure

Code is organized into layered folders (core, repository, services, api) indicating an Onion-like architecture, but service decomposition and config/secret management choices are standard and not demonstrated as production-hardened decisions.

Evidence

onine.core/Entites/BaseEntity.cs

onine.Repository/GenericRepository.cs

onineproject/Extensions/ApplicationServicesExtension.cs

Security & Auth

4/10

Protecting data and access

Authentication and identity are integrated (ASP.NET Identity migrations and identity DB context present) and there is a TokenService, showing attention to auth flows; deeper token lifecycle and revocation patterns are not shown in the provided human-authored files.

Evidence

onine.Repository/Identity/Migrations/20260811221704_Identity.cs

onine.Repository/Identity/AppIdentityDbContext.cs

onineproject/Controllers/AccountController.cs

Reliability & Observability

3/10

Stability and monitoring

Basic reliability/observability patterns exist such as a global exception middleware and error controller, but there is little evidence of retries/backoff, circuit breakers, structured correlation ids, or metrics instrumentation in the analyzed human-authored files.

Evidence

onineproject/Middlewares/ExceptionMiddleware.cs

onineproject/Controllers/ErrorController.cs

onineproject/Program.cs

Expertise

.NET· Middle

Microservices & API Architecture· Middle

Industries

Commerce· Middle

Technologies

C#· since 2026 · Middle

Rest API· since 2026

ASP.NET Core· since 2026

Entity Framework Core· since 2026

AutoMapper

Core· mentioned only

Recommendations

Maintain and extend small-to-medium ASP.NET Core REST APIs and implement new e-commerce features (products, baskets, orders) using the existing layered architecture.
Take ownership of EF Core schema evolution and migrations, including writing integration tests for migrations and coordinating safe deploys for schema changes.
Add production observability and resilience: structured logging/correlation ids, metrics, retries with jitter, and simple circuit breakers for external calls.
Harden auth/token lifecycle: add explicit JWT refresh/revocation flows and corresponding integration tests.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

ECommerce-API CurrencyConverter

Junior Frontend Developer Confidence: Medium UI Engineer

Frontend UI engineer (approx. early-middle level) focused on building polished Angular interfaces and interaction flows - strongest at translating product rules and user answers into clear UI and routine summaries. The most proven skill is UI composition and UX polish as shown by the skin analysis flow and routine generation UI - for example routine.component.ts with its step mapping and skinanalysis.component.html with its loading overlay and progress steps. The public code does not demonstrate advanced frontend engineering topics such as measured performance optimization, request cancellation/optimistic updates, automated tests, or formal accessibility tooling in CI.

UI Component Architecture

4/10

How interface parts are built

Clear Angular component separation and helper functions show deliberate component boundaries and reuse, but no advanced composition or a custom design system is present.

Evidence

SkinCare-Advisor/frontend/src/app/user/components/routine/routine.component.ts: standalone Angular component with helper methods (createRoutineStep, getStepTitle, getStepDescription)

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: many component-level interactive controls and state-driven classes

SkinCare-Advisor/frontend/src/app/admin/components/products/products.component.html: admin form and table UI separated from list rendering

Responsive & Cross-browser

3/10

Works on all screens and browsers

Responsive layout relies on Tailwind grid and breakpoint classes with basic responsive patterns but no advanced feature-detection, RTL, or fluid-type strategies.

Evidence

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: uses md:grid-cols and responsive grid classes

SkinCare-Advisor/frontend/src/app/user/components/routine/routine.component.html: uses md:grid-cols and utility classes for layout

Performance Optimization

1/10

Speed of the interface

No measurable performance work or instrumentation; standard Angular build and template bindings with no virtualization, code-splitting evidence, or bundle analysis artifacts.

Evidence

SkinCare-Advisor/frontend/package.json: Angular build scripts present but no bundle-analysis or performance tooling

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: dynamic bindings (progress width) used but no performance optimizations

Accessibility & Semantics

2/10

Usable for everyone

Basic semantic HTML and image alt attributes are present, and interactive elements use buttons, but there is little explicit ARIA, keyboard focus management, or accessibility tooling evidence.

Evidence

SkinCare-Advisor/frontend/src/app/user/components/products/products.component.html: <img> elements include [alt] binding

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: uses native <button> elements and disabled states for form validation

State Management & Data Flow

3/10

Managing data in the app

Reasonable client-side state handling with services and localStorage checks and basic edge-state handling, but no advanced server-state patterns like request cancellation, optimistic updates, or state machines.

Evidence

SkinCare-Advisor/frontend/src/app/user/components/routine/routine.component.ts: reads skinDataService.getAnalysisData() and localStorage; redirects and shows blocked UI when data missing

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: isLoading overlay and aiStep progress state

UX & Visual Polish

4/10

Look and feel quality

Good visual polish and UX touches - disabled states, progress bar, loading overlays and card components provide a refined user experience even though most effects are presentational.

Evidence

SkinCare-Advisor/frontend/src/app/user/components/skinanalysis/skinanalysis.component.html: AI Loading Overlay with step progress and percentage

SkinCare-Advisor/frontend/src/app/user/components/routine/routine.component.html: AI summary cards, animated UI classes and polished routine item cards

Expertise

Angular· Junior

HTML & CSS· Junior

Industries

Lifestyle· Junior

Technologies

JavaScript· since 2025 · Junior

TypeScript· Junior

Tailwind CSS

Angular· since 2025

Bootstrap· since 2025

PostCSS

autoprefixer

Recommendations

Develop customer-facing Angular UI features and dashboards that require component-driven design and polished responsive layouts.
Implement and extend interactive flows such as rule-based recommendation UIs and admin CRUD panels where the developer can own UX, form validation and client-side mapping logic.
Work on frontend tasks that require converting domain rules into deterministic UI outputs - for example product recommendation flows, summaries and step-by-step wizards.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

SkinCare-Advisor restaurant-crud-system Todo-app

Job preferences

Work permits: Egypt