BackEnd Developer .NET, C#

Onsite Da Nang
English is not required
Working hours: Mon to Fri
1. Core Knowledge
Strong understanding of Object-Oriented Programming (OOP): classes, interfaces, abstract classes, inheritance, polymorphism, encapsulation.
Ability to design and organize code following SOLID principles, clean code, and maintainable architecture.
Knowledge of common backend design patterns: Repository, Dependency Injection, Factory, CQRS, etc.
2. Algorithms & Optimization Mindset
Solid understanding of basic data structures and algorithms: array, list, dictionary/map, tree, graph, queue, stack, hashing, etc.
Ability to analyze time and space complexity using Big-O notation.
Capable of choosing appropriate solutions for real-world performance problems (e.g. large data paging, caching, batch processing).
3. Experience with .NET
Experience working with .NET / .NET Core, preferably .NET 8.
Proficient in C#, ASP.NET Core Web API.
Familiar with Dependency Injection, Middleware pipeline, Configuration, and Logging in .NET.
Experience with Entity Framework Core or similar ORM; understanding of migrations, tracking/no-tracking, transactions.
Able to read, understand, and optimize database queries (SQL Server / PostgreSQL / MongoDB... depending on the system).
4. Development & Operations (DevOps)
Understand basic CI/CD processes: build, test, containerize, deploy.
Experience with Docker (writing Dockerfile for .NET services, building images, running containers).
Able to configure and read service logs in Linux environments (journalctl, docker logs, etc.).
Basic knowledge of reverse proxy / API gateway (e.g. Nginx), SSL/TLS, domain configuration.
Able to monitor and troubleshoot backend services (timeout, memory leak, high CPU, connection pool issues, etc.).
Experience deploying backend services to production environments (on-premise servers or cloud platforms).
5. RESTful API
Strong understanding of RESTful architecture and how to design clear, stateless, scalable APIs.
Mastery of HTTP methods (GET, POST, PUT, PATCH, DELETE...) and correct usage.
Clear understanding of end-to-end request flow:
client request → routing/controller → validation → business/service layer → repository/data access → database/external service → response
(with proper status codes such as 200, 201, 400, 401, 403, 404, 500...).
Experience designing request/response DTOs, pagination, filtering, sorting.
Basic knowledge of authentication/authorization (JWT, API key, header validation).
Experience writing and reading API documentation (Swagger / OpenAPI).
6. Additional Must-Have Skills
Version control with Git (branching strategy, pull requests, code review).
Strong debugging skills and issue tracing through logs.
Basic API security mindset: input validation, rate limiting, avoiding exposing sensitive information in logs.
Comfortable reading technical documents in English (no verbal requirement).
7. AI Knowledge (Basic knowledge of AI is required; hands-on experience is not mandatory)
Experience with Python, including basic syntax, virtual environments (venv/conda), and package management (pip).
Familiar with common AI/ML tools and frameworks such as TensorFlow, PyTorch, OpenAI API, Hugging Face Transformers, or LangChain.
Ability to deploy or integrate AI services or models into .NET systems via REST or gRPC.
Basic understanding of Natural Language Processing (NLP), Computer Vision, and Machine Learning pipelines.
Experience with intelligent APIs, including recommendation, classification, semantic search, or data analysis.