Udi Koren

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Senior Full Stack Engineer

Projects

Jan 2024 - Current (2 years 10 months)

- Developed end-to-end web applications using Node.js (Fastify), React, and Tailwind with a focus on high performance, responsiveness, and clean design. - Built full-stack, production-grade speech-to-speech pipelines using Vosk STT, LLMs, and TTS—integrated via WebRTC, RTP, and gRPC for real-time communication. - Driving AI cost optimization by leveraging local and compact LLMs, prompt engineering, and infrastructure tuning to reduce cloud usage and improve inference efficiency. - Collaborated with DevOps to define infrastructure architecture, enhance CI/CD pipelines, and support scalable, cost-efficient deployments with FinOps considerations.

Senior Full Stack Engineer

Tipalti

Jan 2021 - Jan 2024 (3 years 1 month)

- Led backend development for real-time payment systems and virtual card issuing, including integrations with Stripe, Mastercard, Visa, and Amex. - Architected microservices using Node.js, TypeScript, Kafka, MongoDB, and AWS (SNS, SQS) in a Kubernetes-based CI/CD environment. - Built internal OCR services for receipt matching and document processing workflows. - Collaborated with product and design teams to deliver responsive React UIs aligned with Figma prototypes.

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Technical Lead

Prop Trading

Jan 2017 - Jan 2020 (3 years 1 month)

- Architected distributed alert systems and algorithmic trading tools for TradingView, NinjaTrader, and MetaTrader. - Built backend infrastructure using Node.js, AWS (Lambda, SQS, DynamoDB), PostgreSQL, and web scraping. - Led frontend initiatives with React and Jamstack for server-side rendering and high performance

Senior Full Stack Engineer

SimilarWeb

Jan 2014 - Jan 2016 (2 years 1 month)

Built RESTful APIs and caching layers in ASP.NET and Couchbase, integrating big data pipelines and logging infrastructure with Elasticsearch and Kibana.

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Senior Full Stack Engineer

Seculert

Jan 2012 - Jan 2014 (2 years 1 month)

Developed scalable single-page security applications using ASP.NET, Web APIs, and JavaScript, processing large-scale log data with MongoDB and MS-SQL.

Senior .NET Developer

Conduit

Jan 2008 - Jan 2012 (4 years 1 month)

Led development of scalable ASP.NET web platforms using MVC, WCF, and NServiceBus, integrating with external APIs and optimizing for high-load environments.

Senior .NET Developer

Liveperson

Jan 2005 - Jan 2008 (3 years 1 month)

Built high-traffic web applications using ASP.NET and MS-SQL, focusing on scalable n-tier architecture and SEO optimization for web farm environments.

.NET Developer

Freelancer

Jan 2002 - Jan 2005 (3 years 1 month)

Developed custom web applications and CMS platforms using ASP.NET and C#, collaborating directly with clients from requirements to delivery. Provided full-stack solutions with MySQL/MS-SQL and front-end integration.

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C/C++ Software Engineer

VLSCOM

Jan 2000 - Jan 2002 (2 years 1 month)

Developed video compression enhancement algorithms for MPEG-2/MPEG-4 encoders using C/C++.

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Udi Koren

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