Open to opportunities

Jacob Andresen

@jacobandresen

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Principal Software Engineer building AI-enabled, scalable web platforms with React and LLM workflows.

Denmark

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What I'm looking for

I’m looking to lead engineering that blends product-minded full-stack delivery with AI/LLM features—shipping reliable, multi-tenant SaaS and cloud-native systems, mentoring teams, and improving performance, scalability, and developer velocity in an Agile environment.

I’m a Principal Software Engineer with 9+ years architecting and shipping production-grade web applications across startups, consulting, and enterprise environments. I combine React/Next.js full-stack delivery with deep AI/LLM integration to build intelligent, automated workflows that perform at scale.

Recently, I architected an AI-powered content automation platform using OpenAI and Gemini—improving user engagement by 30%—and delivered a production multi-tenant SaaS platform with strict per-tenant isolation for 15+ enterprise clients. I’ve also led LLM orchestration pipelines (LangChain, FastAPI, RAG), engineered high-throughput REST/GraphQL services with Redis caching (reducing latency 40%), and provisioned cloud-native infrastructure on AWS/GCP using Terraform/Ansible (cutting costs 25%), while mentoring teams and driving Agile execution.

Experience

Work history, roles, and key accomplishments

Principal Software Engineer

Orangetheory Fitness

Oct 2023 - Mar 2026 (2 years 5 months)

Architected an AI-powered content automation platform with React/Next.js and OpenAI/Gemini, increasing user engagement by 30%. Built a production multi-tenant SaaS with LangChain/FastAPI LLM orchestration, cut average API latency by 40%, and led a team of 4 engineers.

React Next.js TypeScript NestJS fastAPI Lang Chain RAG (Vector DB)AWS Terraform

Software Engineer - Full-Stack

Totalmobile Ltd

Jul 2021 - Jun 2023 (1 year 11 months)

Developed and scaled a high-traffic B2B lead generation platform with React/TypeScript and Node.js/NestJS, serving thousands of concurrent users with real-time WebSocket dashboards. Built a GraphQL API gateway consolidating 6+ microservices (35% fewer redundant network calls) and implemented Redis (Bull) background processing for 3,000+ daily tasks.

React TypeScript NestJS GraphQL Redis WebSockets PostgreSQL AWS Microservices

Full-Stack Engineer

Pantrii

Sep 2019 - May 2021 (1 year 8 months)

Built and scaled a mobility-as-a-service platform with React and Python (Django/FastAPI), supporting transit agencies and corporate clients with 99.5% uptime. Improved accessibility (Lighthouse 90+), integrated Stripe and mapping/webhook workflows (40% reduction in onboarding time), and reduced release cycle time by 50% with Docker and GitHub Actions CI/CD.

React Django fastAPI PostgreSQL Webhooks Docker GitHub Actions REST APIs Accessibility

Full-Stack Developer

Erhvervsakademi MidtVest

Jun 2016 - Jul 2019 (3 years 1 month)

Delivered full-stack enterprise web applications using React, Node.js, and PostgreSQL for internal and logistics clients. Launched a greenfield React app that improved rendering performance by 25%, and implemented JWT/OAuth2 authentication and API validation to reduce production API error rates by 30% while hardening security against OWASP threats.

React Node PostgreSQL JWT OAUTH2 REST APIs API Security OWASP