Bogdan Danilin
6+ years exp
10+ projects
Node JS
Python
API Design: 4/10
Data Layer & Database: 4/10
System Architecture: 4/10
Active 13 days ago
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Overview
Technical skills
Roles
Overview
A backend-focused developer at a solid middle level who builds REST services in Python with both Django (including PostGIS work) and FastAPI with async SQLAlchemy. The strongest proven skill is API and data-layer implementation - evidenced by async FastAPI endpoints, a Service abstraction and Alembic/SQLAlchemy migrations. There is limited public evidence of advanced operational practices like systematic observability, retry/backoff patterns, or large-scale distributed design decisions.
Technical skills
Node JS• Junior
Python• Senior • 6y+ • 10+ projects
Node JS
Axios
Databases
PostgreSQL• 6y+ • 10+ projects
Frontend
React.js
React Router
Next.js
Formik
SWR
Tailwind CSS
DevOps
Docker• 5y+ • 10+ projects
Middle Backend Developer
Confidence: Medium API Engineer
A backend-focused developer at a solid middle level who builds REST services in Python with both Django (including PostGIS work) and FastAPI with async SQLAlchemy. The strongest proven skill is API and data-layer implementation - evidenced by async FastAPI endpoints, a Service abstraction and Alembic/SQLAlchemy migrations. There is limited public evidence of advanced operational practices like systematic observability, retry/backoff patterns, or large-scale distributed design decisions.
API Design
4/10
How well APIs are designed
Clear REST API work with pagination and Swagger, but lacking explicit versioning, idempotency keys, and a uniform error contract.
Evidence
SocialMedia/src/posts/router.py: APIRouter endpoints and usage of Depends(current_user)
SocialMedia/src/posts/service.py: pagination and response shaping for API output
GeoService/src/geoservice/urls.py: drf_yasg schema_view + swagger UI exposure
Data Layer & Database
4/10
Working with databases
Multiple schema migrations and use of Postgres/PostGIS and SQLAlchemy; explicit transaction commits and basic rowcount-based 404 handling exist but no strong evidence of advanced transaction/isolation tuning or N+1 elimination auditing.
Evidence
GeoService/src/geoservice/apps/city/models.py: PointField geospatial model
GeoService/src/geoservice/apps/city/migrations/0001_initial.py: Django migration creating City table with PointField
SocialMedia/migrations/versions/8beb636aa0dd_create_database.py: Alembic-generated schema migration
Scalability & Performance
3/10
Handling load and speed
Asynchronous DB usage and pagination indicate scalability awareness; absent are caching strategies, queue decoupling, connection-pool tuning, or documented performance measurements.
Evidence
SocialMedia/src/database.py: async engine / AsyncSession setup (asyncpg usage implied)
SocialMedia/src/posts/service.py: async endpoints and paginate(posts, params)
GeoService/src/geoservice/core/parse.py: bulk CSV parsing under a DB transaction (parse script)
System Architecture
4/10
Overall system structure
Reasonable modular decomposition (apps, api, core, services) and a service abstraction layer; architecture is monolithic-style services rather than a multi-service boundary design with cross-service contracts.
Evidence
SocialMedia/src/base/service_base.py: Service base abstraction used by domain services
GeoService/src/geoservice/urls.py: clear app/module boundaries (api inclusion)
SocialMedia/project layout: separation between auth, posts, database, migrations (migrations/env.py)
Security & Auth
4/10
Protecting data and access
Authentication and security libraries are used and custom auth glue exists (CSRF enforcement, JWT integrations), showing security awareness; token lifecycle, revocation, and hardened input validation are not exhaustively implemented in visible code.
Evidence
LMS_Fogstream/Backend/LMS_Fogstream/accounts/authenticate.py: custom authentication and enforce_csrf
LMS_Fogstream/Backend/LMS_Fogstream/lms/authenticate.py: parallel CSRF/auth integrations
SocialMedia/pyproject.toml and requirements.txt: fastapi-users, djangorestframework-simplejwt and related auth deps present
Reliability & Observability
2/10
Stability and monitoring
Basic reliability patterns exist (DB transactions, rowcount checks, Alembic migration practices), but there is little evidence of systematic observability, retries/backoff, timeouts, graceful shutdown or structured tracing/metrics.
Evidence
SocialMedia/migrations/env.py: alembic env setup and logging config via fileConfig
SocialMedia/src/base/service_base.py: commit patterns and get_404_exception checks
Expertise
Python• Middle
Microservices & API Architecture• Middle
Databases & Vector Storage• Middle
Industries
Education• Middle
Internet Services• Middle
Recommendations
- Develop REST and async backend services (FastAPI + async SQLAlchemy) including paginated endpoints, auth integration and Alembic migrations.
- Build geospatial APIs and data pipelines that use PostGIS and Django GIS models with careful parsing/transaction handling for bulk imports.
- Implement production-grade observability and resilience (structured logging, metrics/tracing, timeouts, retries with jitter) around existing async services.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories:
Junior Frontend Developer
Confidence: Medium App Engineer
A junior-level frontend developer who builds small single-page React apps and simple integrations. The strongest proven skill is implementing a Telegram Web App integration via a focused custom hook (CyberEvil777/WebAppTelegram_React/src/hooks/useTelegram.js) and composing routes/components (CyberEvil777/WebAppTelegram_React/src/App.js). There is little evidence of advanced architecture, performance engineering, accessibility work, testing, or complex server-state handling in the public code.
UI Component Architecture
2/10
How interface parts are built
Small, component-based React app with basic composition but no design system, no clear component boundaries beyond simple file imports.
Responsive & Cross-browser
2/10
Works on all screens and browsers
Basic CSS and fixed layout patterns present; no advanced responsive strategy, container queries or RTL/i18n handling observed.
Performance Optimization
1/10
Speed of the interface
No measured performance work, no code-splitting or virtualization; standard CRA setup only.
Accessibility & Semantics
1/10
Usable for everyone
Little to no accessibility/keyboard focus handling or ARIA on custom widgets; semantics minimal.
State Management & Data Flow
2/10
Managing data in the app
Simple, local state and encapsulated hook for Telegram WebApp; no complex server-state, optimistic updates or cancellation logic.
UX & Visual Polish
2/10
Look and feel quality
Basic UX polish (CSS, component styling) but no explicit loading/error/empty states or UX patterns for offline/undo/perceived performance.
Expertise
React• Junior
Modern Web Frameworks• Junior
PWA & Web APIs• Junior
Technologies
Node JS• Junior
Tailwind CSS
Next.js
React.js
Axios
SWR
Formik
React Router
Rest API• mentioned only
Recommendations
- Develop small to medium single-page React apps and integrations with third-party web APIs (Telegram Web Apps, simple REST endpoints).
- Implement and maintain landing pages or interactive product flows (product lists, simple forms) with clear component boundaries and modest CSS scope.
- Work on feature tasks that require integrating client-side hooks and routing (React Router) rather than large-scale system design or backend services.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories: