David – AWS, React, AI-assisted coding

An AI-powered mobile app that helps users practice and improve their English through immersive, real-world conversations.

• Built and launched an AI-powered English practice app on iOS and Android with conversational AI companions, real-time correction, suggested replies, vocabulary support, and personalized learning flows;
• Designed the LLM orchestration layer with persistent long-term memory using Pinecone, enabling context-aware conversations across sessions while keeping inference costs under control;
• Owned the entire stack across the React Native/Expo client, AWS serverless backend, subscriptions, analytics, and app store releases for both platforms;
• Ran onboarding, activation, retention, and paywall experiments end-to-end, using product analytics to improve conversion and engagement.

A customer-facing SaaS marketplace connecting companies with independent advisors.

• Delivered features across frontend, backend APIs, authentication, data modeling, search, and production operations;
• Designed the consultant–client matching engine on OpenSearch, improving recommendation quality for the platform's core workflow;
• Built serverless backend services on AWS using Node.js Lambda, API Gateway, DynamoDB, S3, Cognito, and SES;
• Owned cloud infrastructure as code with Terraform, enabling reproducible deployments and environment management across AWS services;
• Contributed to architecture decisions, performance optimization, and production support.

A software consultancy delivering web and cross-platform mobile products across multiple client projects.

• Delivered web and cross-platform mobile products across multiple client projects over seven years, progressing from Ionic to React Native on mobile and React on web;
• Led backend evolutions from .NET to Node.js and then to serverless architectures on AWS, modernizing client systems;
• Operated as a senior engineer on client-facing teams, scoping, estimating, and shipping within consultancy timelines.

Early-career experience across consulting and product projects, building PHP web applications and HTML front ends while completing a university degree.

Built PHP web applications and HTML front ends across consulting and product projects while completing a university degree.