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Hi, I'm Daniel Olsen, a senior full-stack engineer with 8+ years of experience focusing on React + TypeScript front-end architecture and Node.js APIs on AWS. I own end-to-end delivery from system design through production operations. I'm known for building scalable, experiment-friendly product surfaces (funnels, onboarding, checkout) with strong performance, observability, and release safety in fast-moving, remote teams.…Hi, I'm Daniel Olsen, a senior full-stack engineer with 8+ years of experience focusing on React + TypeScript front-end architecture and Node.js APIs on AWS. I own end-to-end delivery from system design through production operations. I'm known for building scalable, experiment-friendly product surfaces (funnels, onboarding, checkout) with strong performance, observability, and release safety in fast-moving, remote teams.

Daniel Olsen

Full Stack Developer, Front-End Developer, Back-End Developer, +3

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Hi, I'm Daniel Olsen, a senior full-stack engineer with 8+ years of experience focusing on React + TypeScript front-end architecture and Node.js APIs on AWS. I own end-to-end delivery from system design through production operations. I'm known for building scalable, experiment-friendly product surfaces (funnels, onboarding, checkout) with strong performance, observability, and release safety in fast-moving, remote teams.…Hi, I'm Daniel Olsen, a senior full-stack engineer with 8+ years of experience focusing on React + TypeScript front-end architecture and Node.js APIs on AWS. I own end-to-end delivery from system design through production operations. I'm known for building scalable, experiment-friendly product surfaces (funnels, onboarding, checkout) with strong performance, observability, and release safety in fast-moving, remote teams.

Available to hire

Hi, I’m Daniel Olsen, a senior full-stack engineer with 8+ years of experience focusing on React + TypeScript front-end architecture and Node.js APIs on AWS. I own end-to-end delivery from system design through production operations.

I’m known for building scalable, experiment-friendly product surfaces (funnels, onboarding, checkout) with strong performance, observability, and release safety in fast-moving, remote teams.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Senior Software Engineer at Square Remote

May 1, 2024 - February 28, 2026

Led end-to-end delivery of a React-based growth and onboarding funnel engine (React/TypeScript/Next.js), enabling faster experiment iterations and ~35% faster funnel changes. Designed reusable UI components and form framework (validation, dynamic schemas, localization) with Storybook and strong accessibility. Built and maintained backend-for-frontend services (REST/GraphQL) to aggregate data from internal services, reducing client-side complexity for multi-step funnels. Implemented performance profiling and Core Web Vitals improvements (bundle splitting, memoization, SSR/streaming). Owned data persistence and query performance (PostgreSQL, Redis), cutting p95 API latency during peak traffic. Hardened reliability with OpenTelemetry tracing and dashboards; introduced feature flags and canary rollouts in AWS CI/CD; reduced funnel incidents. Provided architecture reviews and mentorship.

Senior Software Engineer at Philips HealthCare

August 1, 2020 - May 31, 2023

Developed clinician-facing web apps with React and TypeScript, focusing on usability, accessibility, and performance for high-stakes workflows. Implemented secure API layers using Node.js and Python services with OAuth2/JWT patterns, improving consistency of authentication across applications. Designed data models and optimized PostgreSQL queries to support responsive UI experiences and reliable reporting, reducing slow-query hotspots by ~30%. Established automated testing strategy across UI and services (Jest, React Testing Library, API tests), increasing coverage. Partnered with product, QA, and security on system design decisions, threat modeling, and release readiness; improved deployment predictability through CI/CD hardening. Added observability (metrics, logs, traces) and runbooks, reducing on-call toil and shortening incident triage time.

Senior Software Engineer at eBay

April 1, 2018 - August 31, 2020

Built and optimized customer-facing web experiences using React and JavaScript/TypeScript, improving perceived performance and reducing UI errors through better state management and defensive rendering. Delivered scalable backend endpoints in Node.js and integrated with internal services and databases, improving reliability for high-traffic funnels. Implemented experimentation and analytics instrumentation for funnel-like journeys, enabling faster product decisions and cleaner measurement of feature impact. Improved operational quality with structured logging and dashboards, accelerating troubleshooting and reducing repeat incidents.

Software Engineer at Capgemini

January 1, 2017 - April 30, 2018

Developed full-stack features for enterprise clients using JavaScript, React, and Node.js, delivering responsive UI and API integrations under tight timelines. Worked with relational databases (SQL) to implement CRUD workflows and reporting queries, improving data correctness through validation and edge-case handling. Contributed to CI practices and code review standards, improving team throughput and reducing defects during release cycles.

Senior Software Engineer at Philips Health Care

August 1, 2020 - May 1, 2023

Developed clinician-facing web applications with React and TypeScript, focusing on usability, accessibility, and performance for high-stakes workflows in a regulated environment. Implemented secure API layers using Node.js and Python services with OAuth2/JWT patterns, improving consistency of authentication/authorization across multiple applications. Designed data models and optimized queries in PostgreSQL to support responsive UI experiences and reliable reporting, reducing slow-query hotspots by ~30%. Established automated testing strategy across UI and services using Jest, React Testing Library, and API integration tests, increasing coverage and reducing regression escapes to production. Partnered with product, QA, and security to drive system design decisions, threat modeling, and release readiness; improved deployment predictability through CI/CD pipeline hardening. Added observability (metrics, logs, traces) and operational runbooks, reducing on-call toil and shortening incident