247 senior fullstack engineer jobs at 139 companies in United States

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Fullstack Engineer
Australia or Brazil or Canada or France or Germany or Greece or New Zealand or Poland or Portugal or United Kingdom or United States
$190k/yr RemoteFull Time
Fly.io
Fly.io: Developer-focused public cloud providing connected infrastructure for AI agents and their applications.
Senior-level fullstack engineer with strong Elixir/Phoenix skills, comfort with Go, Ruby, and other languages, ability to leverage AI and agents, and a user-focused mindset.
Elixir, Phoenix, Ruby, Rails, JavaScript, Golang, Docker, Firecracker
3w
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Senior Fullstack Engineer
Berlin or Chemnitz or Dresden or Germany or New York City or London or Sydney or Tokyo or Prague or Minneapolis or Saint Paul
HybridFull Time
Staffbase
Staffbase: AI-native employee experience software platform helping enterprises communicate with frontline, deskless, and office employees.
5+ YOETypically 5+ years of fullstack development experience, strong React.js, TypeScript, JavaScript, and backend skills, stakeholder collaboration, mentoring, testing, and fluent English and German.
React.js, TypeScript, JavaScript, Node.js, Kotlin, Go, Java, MongoDB, REST APIs, SDKs, Docker, Terraform, Selenium, Cypress, Kubernetes, GitHub Actions, Prometheus, Grafana, SSO, SAML, OIDC, SCIM, CI/CD
3mo
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Senior Fullstack Engineer - Growth
Los Gatos or Birmingham
RemoteFull Time
The Overflow
The Overflow: Private fintech SaaS platform helping churches, nonprofits, and mission-driven organizations process cash and non-cash donations.
5+ YOE5+ years fullstack engineering experience; strong React, TypeScript, Node.js; experience building RESTful APIs and relational schema; product-led growth mindset; mentorship and on-call participation.
React, TypeScript, Node.js, RESTful API
3d
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Senior Fullstack Developer (MTSD)
Huntsville, Alabama, United States
OnsiteFull Time
Mission Driven Research
Mission Driven Research: Private technical services providing engineering, analysis, and research support to U.S. federal government agencies.
7+ YOEBachelor's degree in scientific or engineering field; 7+ years full-time professional engineering/software development experience; active or ability to obtain Secret Security Clearance; proficiency in Python, C/C++, Rust, TypeScript/React/Angular, and modern fullstack tools.
Python, C/C++, Rust, TypeScript, React, Angular, VS Code, JetBrains, Git, PostgreSQL, Redis, WebSockets, Cesium, WebGL, Three.js, Figma, Docker, CI/CD, Cursor, Windsurf, Claude Code
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Senior Fullstack Engineer - Case Execution
United States or New York City or Brooklyn or San Francisco or Los Angeles
$190k-$220k/yr RemoteFull Time
Radix Health
Radix Health: AI-powered software for healthcare providers to achieve fair out-of-network reimbursement and manage claims.
5+ YOE5+ years of fullstack software engineering experience, backend-focused, with Python, React, data-heavy workflow systems, decision logic, and orchestration experience.
React, Python, Snowflake, dbt, Databricks
3mo
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Fullstack Developer Senior
United States
RemoteFull Time
KIS Solutions
KIS Solutions: Private technology consulting and software development firm delivering software systems for Fortune 500 companies and startups worldwide.
5+ YOE5+ years software engineering including senior/lead experience; expert Java/Spring Boot backend, React/TypeScript frontend, cloud-native (AWS), Kafka, PostgreSQL, CI/CD and testing practices.
React, Spring Boot, Spring Data JPA, Hibernate, Java, TypeScript, React Query, Zustand, PostgreSQL, REST APIs, AWS, EKS, RDS, S3, Google BigQuery, Apache Kafka, GitHub Actions, ArgoCD, Git, Kubernetes, Spring Batch, AG Grid, Microsoft Entra ID, MSAL, OAuth2/OIDC, MapStruct, Lombok, Terraform, AWS CDK, Cursor, Claude Code, GitHub Copilot, Kiro, Model Context Protocol (MCP), GitOps
1d
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Senior FullStack Engineer
United States
OnsiteFull Time
Optum Health
Optum HealthNYSE: UNH: Patient-centered healthcare organization providing primary, specialty, surgical, behavioral and home care to communities nationwide.
6+ YOEBachelor of Engineering or equivalent; 6+ years software engineering; 5+ years Python; experience with Pandas, GenAI, LLM, DevOps, CI/CD, Git, SQL, MySQL, PostgreSQL, API design; cloud platforms preferred.
Python, Pandas, GenAI, LLM, DevOps, CI/CD, Git, Docker, Kubernetes, SQL, MySQL, PostgreSQL, Oracle, AWS, Azure, Google Cloud
2mo
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Senior Fullstack Engineer
United States
RemoteFull Time
Airtop
Airtop: AI web automation platform that helps marketers, sales teams, and operations staff build and run web agents.
5+ YOE5+ years building scalable production backend systems and APIs; strong distributed systems, cloud infrastructure, reliability engineering, and TypeScript skills; familiarity with Go or Python and frontend development.
Kubernetes, Pulumi, GCP, AWS, Kafka, Pub/Sub, SQS, Redis, TypeScript, Go, Python, Postgres, DynamoDB, OpenAI, Anthropic, Gemini, LangChain, LangGraph, Braintrust, LangSmith
3w
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Fullstack Senior Engineer
Austin, Texas, United States
OnsiteFull Time
Move, Inc.
Move, Inc.: Online real estate services connecting buyers, sellers, renters, and agents through listings, tools, and software.
5+ YOE5+ years professional software engineering experience; strong JavaScript/TypeScript, Node.js, React, Next.js, REST/GraphQL APIs; AWS, CI/CD; Bachelor's in Computer Science or equivalent experience.
React, Next.js, JavaScript, TypeScript, Node.js, GraphQL, REST APIs, AWS, CI/CD
2mo
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Senior Fullstack Engineer
New York City, New York, United States
HybridFull Time
Torch Dental
Torch Dental: Private dental supply software helping independent dental practices order, manage, and budget supplies from multiple vendors.
7+ YOE7+ years of software engineering experience with strong frontend focus; deep React and TypeScript expertise; Python/FastAPI backend experience; TanStack Router and Query experience; strong product judgment.
React, TypeScript, Python, FastAPI, TanStack Router, TanStack Query, Django, Zod
2mo
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Senior Fullstack Engineer
Da Nang or San Francisco or United States or Vietnam or Europe
OnsiteFull Time
Flodesk
Flodesk: Private email marketing and commerce SaaS platform for small businesses, creators, solopreneurs, and coaches.
Strong frontend or backend engineering skills; TypeScript, React, modern build tools, SOA, Golang or Node.js, databases, AWS, scalable systems, AI-assisted development, product thinking, ownership, and collaboration.
TypeScript, React, Vite, Turbo, Golang, Node.js, MongoDB, PostgreSQL, AWS, Claude Code, Cursor, Codex, Figma, Shopify, Zapier, WooCommerce, MacBook Pro
2mo
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Senior Fullstack Software Engineer - Network
United States or Canada
$190k-$220k/yr RemoteFull Time
Conveyor
Conveyor: AI customer trust platform automating security reviews and RFPs for SaaS companies.
5+ YOE5+ years fullstack engineering experience building B2B SaaS; strong Python, React, Ruby on Rails, PostgreSQL and AWS experience; familiarity with LLMs; excellent communication and product sense.
Python, React, RESTful APIs, Ruby on Rails, PostgreSQL, AWS, LLMs
3mo
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Staff Fullstack Engineer
United States
RemoteFull Time
Surge AI
Surge AI: Private American data-labeling and AI-training serving AI developers and research institutions.
7+ YOE7+ years building production software; strong fullstack experience with React/TypeScript and Python or Ruby on Rails; CS degree or equivalent STEM background preferred; startup experience and strong communication.
React, TypeScript, Python, Ruby on Rails
1w
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Senior Fullstack Engineer
New York City, New York, United States
$170k-$190k/yr HybridFull Time
Stash
Stash: U.S. fintech helping everyday Americans save, invest, and build long-term wealth through an accessible financial platform.
4+ YOE4-7 years professional software experience; hands-on AI tools (Cursor, ChatGPT); pragmatic Go; API design and integration; production operations, observability, security, reliability; effective cross-functional collaboration.
Cursor, ChatGPT, Go, Consul, Spinnaker, Nginx, TypeScript, React, Node.js, Postgres, SNS/SQS, AWS
3mo
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Senior Fullstack Engineer
United States
$140k-$190k/yr RemoteFull Time
Clarium
Clarium: AI-powered healthcare supply-chain platform serving hospitals and their suppliers.
5+ YOE5+ years industry experience, strong Python, React, TypeScript, RESTful API and SQL skills; FastAPI and AWS are nice to have; startup and healthtech experience preferred.
Python, React, TypeScript, RESTful APIs, SQL, FastAPI, AWS
3mo
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Senior Fullstack Engineer
San Francisco, California, United States
$230k-$280k/yr OnsiteFull Time
Mochi Health
Mochi Health: Private telehealth serving patients with personalized virtual clinical care, weight management, and treatments across 120+ conditions.
5+ YOE5+ years full-stack experience, production systems experience, strong frontend state management, data modeling, ownership of lifecycle, experience with Kubernetes/Terraform/AWS, mentoring skills, and familiarity using frontier AI tools.
Kubernetes, Terraform, AWS, React, CI/CD, Codex 5.3, Claude Opus 4.6
2mo
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Senior Fullstack Engineer
Los Angeles, California, United States
$170k/yr OnsiteFull Time
Flight Story
Flight Story: A media and investment scaling creator-led media brands, ventures, and communities.
Proficient in TypeScript, React, Node.js, Python, JavaScript; experience with Google Cloud or other cloud infrastructure; solid grasp of databases (SQL and NoSQL), APIs, and data modeling; hands-on experience with AI/ML or LLM-based application development.
TypeScript, React, Node.js, Python, JavaScript, Google Cloud, SQL, NoSQL, AI/ML, LLM
1mo
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Senior Fullstack Engineer
Boston or New York City
$180k-$220k/yr HybridFull Time
Layer Health
Layer Health: Private healthcare AI helping health systems automate medical chart review, clinical registries, and care-quality workflows.
7+ YOE7+ years full stack development; fluency in TypeScript, React, and Python; strong communication and problem-solving; ability to work independently and meet in-person in Boston.
TypeScript, React, Python
2mo
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Senior Fullstack Developer
United States or Canada
$120k-$145k/yr RemoteFull Time
Reason One
Reason One: B healthcare digital agency helping health systems build accessible digital experiences that increase access to care.
3+ YOE3+ MgmtRequires 3+ years in technical leadership, 5+ years React, 4+ years Next.js, 3+ years TypeScript, enterprise CMS and API experience, healthcare platform integrations, DevOps, testing, communication, and agile practices.
React, Next.js, TypeScript, HTML, CSS, SCSS, JavaScript, WebPack, Git, Optimizely, Sitecore AI, Storyblok, Kontent.ai, GraphQL, REST, Epic, Cerner, MyChart, Kyruus Health, DexCare, Sparkle, Vercel, Cloudflare Workers, Azure Functions, AWS Lambda, GitHub Actions, Netlify, Claude, Scrum, Kanban
3mo
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Senior Fullstack Engineer
San Francisco, California, United States
$170k-$250k/yr OnsiteFull Time
Circleback
Circleback: AI-powered meeting notes and automations
3+ YOE3+ years building and shipping full‑stack software; experience with React/Next.js, Electron, Swift, React Native; AI and product-oriented engineering judgment.
React, Next.js, Electron, Swift, React Native