Working hours: Mon to Fri
English is not required
Onsite Da Nang
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.
Algorithms & Optimization Mindset
Solid understanding of basic data structures and algorithms: array, list, dictionary/map, tree, graph, queue, stack, hashing, etc.
Capable of choosing appropriate solutions for real- world performance problems (e.g. large data paging, caching, batch processing).
Ability to analyze time and space complexity using Big- O notation.
Experience with .NET
Experience with Entity Framework Core or similar ORM; understanding of migrations, tracking/no- tracking, transactions.
Familiar with Dependency Injection, Middleware pipeline, Configuration, and Logging in .NET.
Experience working with .NET / .NET Core, preferably .NET 8.
Able to read, understand, and optimize database queries (SQL Server / PostgreSQL / MongoDB… depending on the system).
Proficient in C, ASP.NET Core Web API.
Development & Operations (DevOps)
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 with Docker (writing Dockerfile for .NET services, building images, running containers).
Experience deploying backend services to production environments (on- premise servers or cloud platforms).
Understand basic CI/CD processes: build, test, containerize, deploy.
Able to configure and read service logs in Linux environments (journalctl, docker logs, etc.).
RESTful API
Strong understanding of RESTful architecture and how to design clear, stateless, scalable APIs.
Experience designing request/response DTOs, pagination, filtering, sorting.
Experience writing and reading API documentation (Swagger / OpenAPI).
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…).
Basic knowledge of authentication/authorization (JWT, API key, header validation).
Additional Must- Have Skills
Strong debugging skills and issue tracing through logs.
Comfortable reading technical documents in English (no verbal requirement).
Basic API security mindset: input validation, rate limiting, avoiding exposing sensitive information in logs.
Version control with Git (branching strategy, pull requests, code review).
AI Knowledge (Basic knowledge of AI is required; hands- on experience is not mandatory)
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.
Experience with intelligent APIs, including recommendation, classification, semantic search, or data analysis.
Experience with Python, including basic syntax, virtual environments (venv/conda), and package management (pip).
Basic understanding of Natural Language Processing (NLP), Computer Vision, and Machine Learning pipelines.
