Walden Dong Wang

Frontend • Middle • Jersey City, USA • UTC-05:00 • Work permits: United States • English: B2 • Available in 2 weeks

Artificial Intelligence Specialist

5+ years exp

TypeScript

JavaScript

Kotlin

Python

C++

Java

Swift

MATLAB

OCaml

Objective-C

Performance Optimization: 4/10

State Management & Data Flow: 4/10

Active 3 days ago

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Overview

Technical skills

Timeline

Roles

Overview

Middle frontend engineer focused on React and TypeScript with a practical strength in client-side data fetching and caching strategies. The strongest proven skill is client-state and server-state handling as implemented in src/hooks/useCustomFetch.ts and the cache invalidation utilities. There is little evidence of accessibility engineering, automated tests, SSR or measured performance optimization in public code.

Technical skills

Languages

TypeScript

JavaScript

Kotlin

Python

C++

Java

Swift

MATLAB

OCaml

Objective-C

DevOps

Kubernetes

Rest API

AWS

Other

React.js

Django

Flask

Amazon S3

Snowflake

ElasticSearch

API Gateway

AWS Lambda

GitHub

Amazon EKS

OpenSearch

Docker

Splunk

Prometheus

CI/CD

CloudFormation

minikube

Computer Vision

ETL/ELT

Timeline

Data Engineer • Middle

BNY • Full-Time

Aug 2023 to Present 3 Years 1 Month Jersey City In office

Led an end-to-end migration from legacy data sources to Snowflake using Python and Airflow. Built and orchestrated Airflow DAGs on Kubernetes to process and load large-scale datasets into Snowflake. Improved data quality and processing time, and provided ongoing support and performance optimizations for data pipelines. Collaborated with cross-functional teams to align migration work with business goals.

Python

Kubernetes

Software Engineer • Middle

Columbia University in the City of New York • Full-Time

Sep 2021 to Dec 2022 1 Year 3 Months New York In office

Designed course website layouts and implemented functionality from scratch for online video course pages. Added features such as closed captions and interactive tables. Coordinated with a third-party Salesforce team to update alumni-related functions.

Software Engineer • Middle

Intuit Inc. • Full-Time

May 2022 to Aug 2022 3 Months New York In office

Developed and launched a cryptocurrency trading platform using Kotlin. Wrote unit tests for REST APIs to significantly increase test coverage. Built Splunk dashboards to monitor trading activity and API response times, and collaborated with the Money Onboarding team to implement W9 information collection.

Kotlin

Rest API

Software Engineer • Middle

Sonar Health • Full-Time

May 2021 to Jan 2022 8 Months New York In office

Built a public health tracking app to help patients monitor health conditions and exams. Improved the user interface by editing existing code and iterating on functionality. Participated in recurring technical meetings to discuss project progress and implementation approaches.

JavaScript

Middle Frontend Developer Confidence: Medium App Engineer

UI Component Architecture

2/10

How interface parts are built

Minimal bespoke component architecture is visible; styles and class naming indicate an attempted design system but there are no component implementations or composition patterns to evaluate.

Evidence

waldenwang9966/rampfrontend/src/index.css: Ramp* class naming and design-token variables waldenwang9966/rampfrontend/src/hooks/useCustomFetch.ts: use of AppContext for cache integration which implies component-level data ownership

Responsive & Cross-browser

3/10

Works on all screens and browsers

Basic responsive considerations via a centered main container and CSS variables are present, but there is no evidence of advanced responsive techniques, RTL support, or feature detection.

Evidence

waldenwang9966/rampfrontend/src/index.css: .MainContainer max-width and padding patterns waldenwang9966/rampfrontend/src/index.css: use of CSS custom properties for tokens

Performance Optimization

4/10

Speed of the interface

Clear, deliberate client-side caching and pagination strategies are implemented; however there is no measured performance data, bundle analysis, or advanced runtime optimizations.

Evidence

waldenwang9966/rampfrontend/src/hooks/useCustomFetch.ts: fetchWithCache, getCacheKey, clearCacheByEndpoint implementations waldenwang9966/rampfrontend/src/hooks/usePaginatedTransactions.ts: paginated fetch and concatenation logic waldenwang9966/rampfrontend/src/utils/fetch.ts: fakeFetch mock with controlled timeouts and logging

Accessibility & Semantics

1/10

Usable for everyone

Little to no evidence of accessibility work; templates and CSS exist but ARIA, keyboard management or a11y testing are not present.

Evidence

waldenwang9966/4115project/4115project/templates/applicant_submit.html: plain form markup without ARIA or explicit accessibility attributes waldenwang9966/rampfrontend/src/index.css: visual styles but no accessibility helper classes or prefers-reduced-motion handling

State Management & Data Flow

4/10

Managing data in the app

Shows practical server-state discipline with a cache layer, cache invalidation by endpoint, and a wrapped request helper for loading state; race handling and optimistic updates are not visible in the provided files.

Evidence

waldenwang9966/rampfrontend/src/hooks/useCustomFetch.ts: cache usage, getCacheKey and clearCacheByEndpoint waldenwang9966/rampfrontend/src/hooks/usePaginatedTransactions.ts: incremental pagination and invalidateData waldenwang9966/rampfrontend/src/utils/requests.ts: defensive checks in paginated helper (page null check, bounds checking)

UX & Visual Polish

3/10

Look and feel quality

Basic UX elements for loading and error states exist (styles and classes), and mock logging supports developer experience; there are no skeleton components, undo patterns, or perceptual performance tactics shown.

Evidence

waldenwang9966/rampfrontend/src/index.css: .RampLoading--container and .RampError styles waldenwang9966/rampfrontend/src/utils/fetch.ts: mockApiLogger for request lifecycle visibility

Expertise

React• Middle

HTML & CSS• Junior

Technologies

TypeScript• since 2022 • Middle

React.js

Recommendations

Develop data-driven React single-page features that need client-side caching and pagination (dashboards, admin panels).
Implement and maintain application-level hooks and utilities around API calls and cache invalidation.
Work on small-to-medium frontends where building custom hooks, mocking APIs and integrating with design tokens are primary responsibilities.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

4115project rampfrontend rampchallengepublic

Junior Backend Developer Confidence: Medium Generalist

A Junior Python developer practicing fundamental programming exercises and classroom challenges. The strongest proven skill is basic Python scripting and data-structure manipulation as shown in week_4/importing/import_lesson.py and multiple library_challenge solution files. There is no evidence of backend API development, databases, scalability work or production-grade engineering practices in the public human-authored code.

API Design

How well APIs are designed

Not evidenced in public code

Data Layer & Database

Working with databases

Not evidenced in public code

Scalability & Performance

Handling load and speed

Not evidenced in public code

System Architecture

Overall system structure

Not evidenced in public code

Security & Auth

Protecting data and access

Not evidenced in public code

Reliability & Observability

Stability and monitoring

Not evidenced in public code

Verified artifacts

Halleloya/DBAC• ★ 3 cmbayo/ark• PR

Expertise

Python• Junior

Technologies

Java

Kotlin• since 2022 • Middle

OCaml

Rest API• since 2022

Flask

Django

Recommendations

Work on small end-to-end projects that include a simple REST API, for example a Flask or FastAPI service that persists to a database and includes basic tests.
Add a database-backed feature with migrations (Alembic/SQLAlchemy or Django models) to learn schema evolution, transactions and queries.
Introduce basic reliability and observability: add structured logging, simple unit tests, and a CI workflow to validate changes automatically.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

Pod4_repo color-picker hellosite

Intern DevOps Engineer Confidence: Low Generalist

A junior Python web developer focusing on small Django applications and learning web fundamentals. The strongest proven skill is server-side web development with class-based views and form handling, demonstrated by implemented view classes and a custom form. There is no public evidence of CI/CD, infrastructure as code, container orchestration, observability, or production-grade reliability engineering.

CI/CD Pipelines

Automated build and deploy

Not evidenced in public code

Infrastructure as Code

Managing servers with code

Not evidenced in public code

Containerization & Orchestration

Working with containers

Not evidenced in public code

Observability & Monitoring

Watching system health

Not evidenced in public code

Reliability & Incident Response

Keeping systems up

Not evidenced in public code

Cloud & Cost Optimization

Smart use of the cloud

Not evidenced in public code

Recommendations

Develop small to medium Django CRUD applications and internal admin dashboards to consolidate web fundamentals.
Add unit and integration tests and create a simple CI pipeline to automate testing and basic deployments.
Create a Docker multi-stage build and a minimal deployment manifest to learn containerization and deployment practices.
Introduce basic logging and metrics instrumentation and a simple alert rule to gain observability experience.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

color-picker hellosite