Senior Full Stack Developer jobs in United States
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CoLab · 6 hours ago

Senior Full Stack Developer

positionGreater St. John's Metropolitan Area
timeFull-time
remoteOnsite
senioritySenior Level
date5+ years exp

CoLab is a cloud-based platform for engineering design review, aiming to help mechanical engineering teams bring life-changing products to market faster. The role involves building features and infrastructure that integrate with large language models and machine learning systems, focusing on end-to-end delivery of AI-assisted design checker capabilities.

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Responsibilities

Build and maintain user-facing features and APIs that integrate LLM and ML capabilities
Design and scale backend systems to support vector search, agent workflows, and human-AI collaboration
Collaborate closely with product and design to shape intelligent, intuitive user experiences
Prototype, prompt, and evaluate LLM solutions using tools like OpenAI, Anthropic, and Hugging Face
Mentor teammates through code reviews, design sessions, and paired debugging
Contribute to technical direction and best practices across the stack
Measure and optimize performance and reliability at scale

Qualification

Full-stack developmentPythonReactAI/ML experienceTypeScriptAPIsRelational databasesNoSQL databasesAutomated testingGit workflowGraphQLObservability toolsCuriositySelf-directedCollaboration

Required

5+ years full-stack development experience
Proficient in Python and its libraries, with hands-on experience in designing, developing, and maintaining robust and scalable APIs
Proficient in React, TypeScript and front-end tools such as Webpack, Vite, npm and ESLint
Hands-on experience with relational databases (e.g., PostgreSQL, MySQL), NoSQL databases (e.g.: DynamoDB), vector databases (e.g., OpenSearch, Pinecone, FAISS) and querying frameworks/APIs (e.g.: SQLAlchemy)
Experience writing robust automated tests, including unit, as well as end-to-end (E2E) tests using Cypress or Playwright
AI/ML Experience: Libraries: PyTorch, Hugging Face, Scikit-Learn
Agent workflows: pydantic-ai
Experience integrating and prompting large language models (LLMs) via APIs (e.g., OpenAI, Anthropic, Google Gemini)
Experience working with ML services in the cloud infrastructure, e.g. Sagemaker, Bedrock, etc
Solid Git workflow knowledge and test-driven development practices
Self-directed, curious, and collaborative

Preferred

GraphQL experience
Familiarity with observability tools (e.g., DataDog, Retool)

Benefits

Extended health and dental
RRSP matching
Unlimited paid vacation

Company

CoLab

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CoLab is a cloud based platform for engineering design review.
dateFounded in 2017
location
St. John's, Newfoundland, CAN
people-size51-200 employees
web-link
https://www.colabsoftware.com

Funding

Current Stage
Growth Stage
Total Funding
$132.83M
Key Investors
Intrepid Growth PartnersInsight PartnersCanada's Ocean Supercluster
2025-11-10Series C· $72M
2025-11-10Secondary Market· $17.2M
2024-05-09Series B· $21M

Leadership Team

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Adam Keating
Co-Founder & CEO
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Jeremy Andrews
Co-Founder & CTO
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Recent News

BetaKit
CoLab joins Nvidia Inception Program to beef up AI capabilities for its engineering tools
2025-12-20
entrevestor.com
NL Again Leads Region in Funding
2025-12-09
SiliconANGLE
Amazingly, AI companies are still short of data centers — but not money to build them
2025-11-15
Company data provided by crunchbase