247 senior fullstack engineer jobs at 139 companies in United States
1mo
Save
Mark Applied
Hide
1mo
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/yrRemoteFull Time
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.
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: 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.
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.
United States or New York City or Brooklyn or San Francisco or Los Angeles
$190k-$220k/yrRemoteFull Time
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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.