leetcodenotesdpbitsetknapsack
LeetCode 3181 – Max Total Reward
Detailed analysis and solution for LeetCode problem 3181: Max Total Reward, using dynamic programming and bitset optimization.
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M.Sc. CS Graduate / Backend Engineer
Hello, I am Daniel Tian
M.Sc. Computer Science new graduate specializing in backend engineering and cloud-native applications on AWS. Hands-on experience with Java Spring Boot microservices, REST APIs, and production-ready DevOps practices.
Degree
M.Sc. Computer Science
Microservices
10+ services
Focus
Backend & Cloud
Resume Highlights
Full experience →Software Development Engineer Intern · Invision Inc.
May 2025 — Aug 2025Backend engineer for Financial Pulse, a social-style financial tracking platform on AWS.
- Built Spring Boot microservices and REST APIs for posts, follows, and personalized feeds.
- Added SQS + Lambda async processing, cutting write API response time ~40% in staging tests.
- Secured APIs with Spring Security (JWT) and documented endpoints via Swagger/OpenAPI.
High-Availability E-commerce Platform · Academic Project
Dec 2022 — May 2023Microservices-based e-commerce system focused on scalability and fault isolation.
- Implemented 10+ Spring Cloud services with Docker-based deployment.
- Used RabbitMQ + Redisson locks to reduce flash-sale order latency from ~2s to ~200ms.
- Integrated Elasticsearch to improve search and ranking performance.
Tech Stack & Focus
Business delivery first, continuously improving full-stack skills.
Backend
JavaSpring BootSpring CloudREST APIsJWT/Spring SecuritySwagger/OpenAPI
Cloud & DevOps
AWS (EC2, RDS, DynamoDB, Lambda, SQS)CloudFormationDockerLinuxGitHub Actions (CI/CD)
Data & Search
PostgreSQLMySQLRedisElasticsearch
Current focus: backend architecture, system design, service governance, and observability.
Featured Projects
Top 3 representative Projects
AWS Microservices
Financial Pulse (AWS)
Social-style financial tracking platform with Spring Boot microservices and REST APIs.
EC2, RDS, DynamoDB, SQS, Lambda, Spring Boot
High Concurrency
High-Availability E-commerce Platform
10+ Spring Cloud services with RabbitMQ, Redis, and Elasticsearch for search and flash sales.
RabbitMQ, Redisson, Redis, Elasticsearch, Docker
DevOps
CI/CD Automation
Automated build, test, and deploy pipelines using GitHub Actions and CloudFormation.
GitHub Actions, CloudFormation, AWS
Featured Notes
More →sortingalgorithmsheap
Heap Sort
Heap Sort is an efficient, in-place sorting algorithm that utilizes the properties of a binary heap data structure to sort elements in O(n log n) time complexity.
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