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Wang JinYin
Wang JinYin

Senior AI Engineer and Senior Backend Engineer

Open to offers · Member since 5 Nov 2026
Location
Dalian, China
Desired salary
Unspecified
Work preference
Remote Only / Full Time
Experience level
Senior

About

Professional summary

I am a Senior Software Engineer and AI Application Engineer with approximately 10 years of experience building backend systems, enterprise software, distributed applications, and AI-powered products.

I specialize in Python backend engineering, including FastAPI, Django, RESTful APIs, SQL, PostgreSQL, Redis, and scalable cloud-native services. I focus on building reliable, maintainable systems with strong performance, testing, and operational practices.

I have hands-on experience integrating Large Language Models into production applications through OpenAI and Azure OpenAI APIs. My AI engineering work includes prompt engineering, structured outputs, JSON Schema validation, workflow automation, and LLM application integration.

I build Retrieval-Augmented Generation applications using document processing, embeddings, semantic search, contextual retrieval, and response generation. I also evaluate AI-generated content and code for correctness, consistency, security, edge cases, performance, and maintainability.

I am experienced with unit, integration, and API automation testing, as well as code reviews, debugging, root-cause analysis, refactoring, and CI/CD-oriented development. I work with Docker, Kubernetes, cloud platforms, and collaborative Git-based workflows.

As a native Mandarin Chinese speaker with professional English proficiency, I can assess multilingual AI content, communicate complex technical concepts, write engineering documentation, and collaborate effectively with international teams.

Skills

35 capabilities
API TestingBackend DevelopmentC#C++CachingCI CDCode ReviewData ExtractionData ValidationDatabase DesignDatabase OptimizationDebuggingDistributed SystemsEmbeddingsEvent Driven ArchitectureGoIntegration TestingJavaJavaScriptLarge Language ModelsObject Oriented ProgrammingPerformance OptimizationPrompt EngineeringPythonRefactoringReliability EngineeringRESTful APIsRoot Cause AnalysisSemantic SearchSoftware ArchitectureSoftware Design PatternsSQLTest Driven DevelopmentTypeScriptUnit Testing

Tech stack & tools

Working toolkit

Application Hosting

JenkinsRedis

Data Stores

MongoDBMySQLPostgreSQL

Development

DockerGitKubernetesTerraform

Languages & Frameworks

DjangoFastAPIPyTest

Experience

Career history

Senior Backend / AI Software Engineer PingCAP

Designed and developed scalable Python backend services, RESTful APIs, and cloud-native applications for enterprise software requirements. Used Python, SQL, FastAPI, Django, TypeScript, Node.js, PostgreSQL, and Redis to build reliable backend functionality and improve database and caching performance.

Integrated OpenAI and Azure OpenAI LLM APIs into backend applications to support intelligent workflows, structured outputs, automated processing, and AI-powered functionality. Built RAG components for document processing, embeddings, semantic search, contextual retrieval, and response generation.

Evaluated AI-generated outputs and code for correctness, technical accuracy, completeness, edge cases, security, and maintainability. Implemented unit, integration, and API automation testing with Pytest, investigated production issues, and delivered root-cause fixes to improve stability.

Backend / Full Stack Software Engineer EMQ Technologies

Developed and maintained backend services and web applications using Python, Django, Node.js, JavaScript, TypeScript, and REST APIs. Designed modular backend components and third-party integrations for enterprise application requirements.

Designed and optimized database operations with PostgreSQL, MongoDB, and Redis, including SQL queries, data validation, access logic, and structured API responses. Built asynchronous and event-driven features to support application workflows and integrations.

Performed code reviews, debugging, refactoring, and testing to improve performance, maintainability, and product quality. Developed unit, integration, and API tests to identify defects and prevent regressions.

Software Developer / Backend Engineer Tapdata

Developed backend applications, database-driven systems, and reusable software components using Python, JavaScript, C#, Java, and SQL. Designed RESTful APIs and web services to connect applications, databases, and third-party systems.

Built data extraction, validation, transformation, and synchronization functionality. Designed relational database structures and implemented SQL queries, joins, transactions, and indexing using PostgreSQL, MySQL, and MongoDB.

Participated throughout the software delivery lifecycle, including requirements analysis, development, testing, deployment, maintenance, source control, and collaborative development with Git.

Education

Learning history

Dalian University of Technology

Bachelor's Degree, Computer Science and Technology

Bachelor's degree in Computer Science and Technology.

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