Open to opportunities

David Zhang

@davidzhang

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Experienced Senior Full Stack Engineer with a focus on innovative solutions.

Poland

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What I'm looking for

I am looking for a role that challenges me technically and allows for continuous learning and growth, ideally in a collaborative environment focused on innovative solutions.

With a decade of experience as a software engineer, I have honed my skills in guiding products through their lifecycle, from ideation to delivery and support. This journey has not only deepened my technical expertise but also enhanced my understanding of customer needs, allowing me to continuously improve both myself and the products I work on.

Throughout my career, I have successfully built and maintained complex systems across various domains, including fintech, AI, and e-commerce. My work at TheoremOne involved creating a trading platform that integrated multiple broker APIs and developed a serverless infrastructure on AWS. I also spearheaded the development of an AI-driven SEO intelligence platform and a healthcare solution that utilized advanced machine learning techniques to generate personalized treatment plans.

I thrive in environments that challenge me to innovate and push the boundaries of technology. My passion for learning and adapting to new challenges drives my commitment to delivering high-quality software solutions that meet the evolving needs of users and businesses alike.

Experience

Work history, roles, and key accomplishments

Full Stack Fintech Engineering

TheoremOne

Jan 2024 - Present (1 year 5 months)

Built a trading platform for US stocks using fiat and crypto wallets to expand retail investor access. Integrated broker APIs (Alpaca, Kraken, Bybit, IB) for multi-asset execution and real-time price aggregation.

NestJS TypeScript AWS Lambda API Gateway Step Functions Cognito Kafka React Next.js React Native Stripe Grafana Redash

Full Stack AI Healthcare Engineering

TheoremOne

May 2023 - Present (2 years 1 month)

Built AI SaaS for orthodontists to generate personalized treatment plans from CBCT and 3D dental models. Developed secure, HIPAA-compliant backend using Python, Flask, PostgreSQL, and AWS services.

Python Flask PostgreSQL AWS OpenAI GPT 4 Celery RabbitMQ Redis React Nginx

Full Stack AI Martech Engineering

TheoremOne

May 2022 - Present (3 years 1 month)

Built SEO intelligence platform with automated content analysis, keyword tracking, and technical SEO auditing. Integrated Claude-4, Firecrawl, and DataForSEO APIs to deliver scalable, AI-driven SEO insights.

Firecrawl DataForSEO APIs Model Context Protocol (MCP)

Full Stack E-Commerce Engineer

OneBeyond

Dec 2019 - Present (5 years 6 months)

Developed and maintained a high-traffic e-commerce platform using Next.js and microfrontend architecture to ensure modularity, scalability, and fast page performance. Integrated Contentful CMS for dynamic content management.

Next.js Micro Frontend Management Contentful Salesforce CRM GTM

Full Stack Martech Developer

IntexSoft

Oct 2015 - Present (9 years 8 months)

Developed and maintained end-to-end solutions using Microsoft .NET (C#, ASP.NET Core) and SQL Server for clients integrated with CampaignMonitor and MarketingEngageCloud platforms. Built responsive and dynamic frontend applications using HTML5, CSS3, JavaScript, and modern frameworks.