Senior Backend Engineer - Python, C#, React, SQL, Cloud-Native Systems

Christopher Tran

Sugar Land, TX *****.****.*******@*****.*** 830-***-**** linkedin.com/in/chrislongtran/

SUMMARY

Backend Software Engineer with 10 years of experience with strong proficiency in Python, C# and React, and extensive experience working with SQL databases. Skilled in designing, developing, and maintaining scalable, high-performance full-stack applications, translating business requirements into reliable technical solutions, optimizing system performance, and collaborating closely with cross-functional teams to deliver secure, maintainable, and production-ready software.

EXPERIENCE

Senior Software Engineer

Walmart Jan 2023 – Present

•Improved backend performance using C# and Python Core by optimizing algorithms, refactoring service layers, and introducing efficient abstractions that reduced processing latency and improved throughput across warehouse operations.

•Optimized React frontend components within the WMS system, reducing page load times by refactoring rendering logic, improving state management, and implementing efficient data parsing for high-volume operational workflows.

•Designed and implemented microservices following core Microservice Architecture principles, ensuring scalability, fault tolerance, service isolation, and maintainable distributed system design.

•Built secure cloud-native backend systems on GCP and Azure, applying security best practices including IAM, encryption, network controls, and secrets management.

•Designed data models and workflows using PostgreSQL, Kafka, and Redis to handle transactional data, event-driven processing, caching, and asynchronous communication.

•Implemented service-to-service communication using RPC frameworks and GraphQL APIs, enabling efficient data access patterns and flexible integrations across WMS components.

•Supported deployment and operation of backend services on cloud infrastructure, collaborating with platform teams to improve service reliability, monitor performance metrics, and troubleshoot production issues efficiently.

•Mentored junior engineers by reviewing C# and React code, sharing best practices on abstraction design and performance optimization, and providing guidance to improve code quality and maintainability.

•Strengthened system reliability by expanding unit and integration testing coverage using xUnit and automated test pipelines, ensuring performance optimizations and refactors were safely validated before production releases.

Senior Software Engineer

Cedar Apr 2019 – Dec 2022

•Developed a scalable EHR system by building backend services using ASP.NET Core Web API and SQL server, encapsulating business rules with domain services and improving maintainability.

•Built and optimized RESTful APIs in C# to integrate EHR functionalities with third-party systems, ensuring secure, efficient, and compliant data exchange in healthcare environments.

• Managed and optimized SQL Server databases, writing SQL queries, stored procedures, and indexes to maintain data integrity, improve reporting, and support high-volume clinical operations.

•Applied object-oriented programming principles and best coding practices in C#, improving maintainability, reducing defects, and enabling scalable, robust EHR system features.

•Collaborated with cross-functional teams using Agile/Scrum, participating in code reviews, debugging, and production support, ensuring system reliability, regulatory compliance, and continuous improvement.

Software Engineer

Oracle Jan 2017 - Mar 2019

•Assisted in developing frontend modules of the EHR system using ASP.NET MVC, implementing user-friendly interfaces and workflows to enhance clinician and patient interaction efficiency.

•Supported the creation and optimization of RESTful APIs and SQL Server databases, including stored procedures and queries, ensuring accurate data exchange and system performance.

•Contributed to backend development using ASP.NET and C#, implementing secure services for patient data management, appointment scheduling, and clinical process automation.

•Participated in code reviews, debugging, and cross-team collaboration following Agile methodologies, applying object-oriented programming principles and best practices for maintainable, scalable EHR solutions.

Skills

Languages: JavaScript (ES6+), TypeScript, Python, Go, SQL, HTML5, CSS3/Sass/Less, Shell Scripting, JSON, GraphQL

Frameworks: React, Next.js, Redux, React Query, Zustand, Context API, Apollo Client, Node.js, Express.js, FastAPI, Flask, Django,

State Management: Redux, Redux Toolkit, React Context API, MobX, Redux Thunk, React Query, Zustand, NgRx

Databases: PostgreSQL, MySQL, MongoDB, Redis, Firebase, Elasticsearch, CouchDB, DynamoDB, Firestore, SQLite

Testing & QA: Jest, React Testing Library, Cypress, Selenium, Jasmine, Karma, PyTest, unittest, Go testing, Postman

Tools & Libraries: Webpack, Babel, Vite, ESLint, Prettier, NGINX, npm, Yarn, pnpm

Cloud & DevOps: AWS (EC2, S3, Lambda, RDS, ECS, CloudFront, DynamoDB), Google Cloud Platform (GCP), Microsoft Azure, Docker, Kubernetes, Terraform, Jenkins, GitHub Actions, GitLab CI/CD, CircleCI

Other tools & Practices: Agile/Scrum, Microservices, RESTful APIs, GraphQL APIs, WebSockets, gRPC, Performance Optimization, Accessibility (a11y), Security Best Practices, Code Reviews, System Design

EDUCATION

Bachelor’s Degree National University of Singapore 2012-2016

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