Victor Krim
Verified Expert in Engineering
React Developer
Toronto, Canada
Toptal member since June 22, 2026
Victor is a senior full-stack engineer with 5 years of experience in machine learning and scalable web infrastructure for clients, including OpenAI, NexusBee, and McGill Genome Centre. His primary expertise is in React, Kubernetes, and AWS for the technology and research industries, where he thrives in distributed cloud environments. He reduced the Largest Contentful Paint by approximately 30% while at OpenAI.
Portfolio
Experience
- React - 7 years
- Prisma - 7 years
- Playwright - 7 years
- User Interface (UI) - 7 years
- PostgreSQL - 7 years
- TensorFlow - 7 years
- Python - 7 years
- TypeScript - 7 years
Preferred Environment
AWS IoT, Azure, Kubernetes, Google Cloud Platform (GCP), Docker, Git, Jira, Cloud Foundry
The most amazing...
...application environment I've built is a simulated full-stack stack for training multimodal LLM agents at OpenAI.
Work Experience
Senior AI Engineer
OpenAI
- Developed and maintained 4 simulated full-stack application environments and MCPs for training multimodal LLM agents using React, Nest.js, Prisma, and Terraform.
- Performed manual UI, REST API, and Websocket testing, ensuring adherence to feature spec.
- Wrote E2E CI test suite in Playwright with 100% coverage of key user journeys.
- Identified and applied optimizations to reduce the Largest Contentful Paint by approximately 30%, saving significant agent compute time per training cycle.
AI Data Engineer
Freelance
- Developed machine learning data pipelines in Spark and Airflow for over 100,000 documents, equivalent to 3 years of full-time human effort.
- Caught a security vulnerability related to a model’s knowledge cutoff, which had gone unnoticed for 6 months.
- Engineered automated safety and quality metrics in PyRIT, rejecting poor completions with 100% sensitivity and 76% specificity.
React Native Developer
NexusBee
- Trained and deployed a two-way recommender using TensorFlow and Keras, increasing KPIs by between 50% and 90% compared to random matching.
- Managed cloud-native distributed back end with GraphQL, PostgreSQL, and Kubernetes.
- Implemented session management with Redis, OAuth2, and JSON Web Tokens (JWTs).
- Implemented event-driven messaging and multimedia services using Kafka and AWS.
Software Developer
McGill Genome Centre
- Raised the software’s average yearly citation rate by 29% after a major UX redesign.
- Achieved a reduction from quartic to cubic running time of algorithms in C and Python, expanding model capacity by more than 30 times.
- Integrated GitHub Actions for automated testing of code repositories.
- Managed documentation pages with Node.js and Jekyll.
Experience
Tracts
Education
Bachelor's Degree in Engineering
McGill University - Montreal, QC, Canada
Skills
Libraries/APIs
React, Playwright, TensorFlow, Node.js, NumPy, Scikit-learn, Pandas, PyTorch, Keras, Vue, SciPy
Tools
Prisma, Terraform, Apache Airflow, Git, Jira, Figma, Seaborn, Apache Maven
Languages
Python, TypeScript, HTML, CSS, C++, SQL, JavaScript, GraphQL, C, C#, Java, Swift, Kotlin, Perl, R, SAML
Frameworks
Flask, Express.js, Spark, Pyrite, Angular, Blazor, Hadoop, Spring Boot
Storage
PostgreSQL, Elasticsearch, Redis, NoSQL, SQL Loader
Industry Expertise
Bioinformatics
Paradigms
Model Context Protocol (MCP)
Platforms
Kubernetes, AWS IoT, Azure, Google Cloud Platform (GCP), Docker, Oracle
Other
User Interface (UI), WebSockets, CI/CD Pipelines, FastAPI, Version Control, DNA Sequencing, Genomics, Computational Biology, Kafka, Cloud Foundry, Retrieval-augmented Generation (RAG), SOAP, Biology, Research, Physics
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