Source Job

US

  • Lead full-stack technical strategy and architecture for messaging, personalization, and experimentation platforms at enterprise scale.
  • Design resilient microservices, robust data models, and clean API contracts while partnering on modular React/TypeScript components.
  • Mentor senior and mid-level engineers, drive architectural trade-offs, and champion observability, testing, and CI/CD best practices.

React TypeScript JavaScript HTML5 CSS

20 jobs similar to Principal Software Engineer

Jobs ranked by similarity.

$199,750–$260,000/yr
US

  • Drive front-end architecture and technical strategy across the NodeZero platform.
  • Mentor engineers and lead complex initiatives spanning multiple teams.
  • Build scalable, reusable UI systems and developer workflows in React and TypeScript.

Horizon3 is a fast-growing, remote cybersecurity company whose NodeZero platform delivers autonomous pentesting to find, fix, and verify attack vectors. It's a team of ex-special ops and startup engineers focused on collaboration, ownership, and results.

$190,800–$267,100/yr
US

  • Design and evolve the Shreddit web platform's architecture, performance, and developer tooling powering reddit.com for hundreds of millions of users.
  • Lead end-to-end delivery of complex cross-service initiatives in asset delivery, HTML processing, observability, and reliability for core web experiences.
  • Mentor junior and mid-level engineers and champion best practices while advancing developer experience through AI tooling and streamlined CI/CD pipelines.

Reddit is a community of communities built on shared interests and trust, home to open and authentic conversations on the internet. With 100,000+ active communities and about 130 million daily active visitors, it is one of the internet's largest sources of information.

$151,000–$178,500/yr
US

  • Lead and evolve the architecture of the core platform, including React frontend, Node.js/Express APIs, Postgres, and AWS ECS infrastructure.
  • Mentor engineers across all levels through pairing, review, and coaching, establishing engineering standards and practices.
  • Partner with engineering leadership and product to scope and de-risk large technical initiatives, driving delivery and production support.

AnswersNow is trailblazing the future of autism therapy with an innovative virtual ABA therapy platform designed by clinicians to make therapy more immediate, accessible, and effective. The company operates fully remote with a team focused on reshaping autism therapy, though its specific size and culture details are not provided.

$160,000–$170,000/yr
US

  • Partner closely with product and executive leadership to inform and implement company strategy.
  • Drive technical strategy and architecture for the forecasting product across all engineering domains.
  • Champion operational excellence, security, and compliance while mentoring engineering staff.

Endpoint is an interactive response technology (IRT) systems and solutions provider that supports the life sciences industry. Since 2009, the company has grown to have offices across the US, Europe, and Asia, focused on helping sponsors achieve clinical trial success.

US

  • Shape the end-to-end user experience of the Hypori Console by gathering feedback from stakeholders and defining efficient interaction patterns.
  • Lead front-end architecture for the Console, including component structure, state management, and build tooling, while staying fluent in backend services.
  • Deliver features end-to-end from UI through REST APIs in a microservices environment deployed on Kubernetes, with a focus on accessibility and security.

Hypori, Inc. is a high-growth cybersecurity SaaS company transforming secure mobility with a virtual workspace platform that lets users access enterprise apps and data from any mobile device without storing data on the endpoint and ensuring total personal privacy. Backed by $55M in funding from investors including UBS, AE Industrial Partners, Hale Capital Partners, and GreatPoint Ventures, it is expanding into new commercial and regulated markets.

India

  • Own the frontend architecture: state, data fetching, routing, module boundaries, and build tooling across ~690K lines of TypeScript/React.
  • Drive performance as a measurable metric, reducing bundle size and improving user experience with concrete targets.
  • Mentor engineers and shape a codebase safe for coding agents, with typed boundaries, lint rules, and fast feedback loops.

We're building the AI agents that run insurance — a trillion-dollar industry still powered by manual work. We've raised $30M+ from top investors, grown 10x in the last 12 months, and work with Fortune 100 companies.

$165,000–$180,000/yr
US

  • Serve as a hands-on technical leader designing and evolving internal enterprise platforms that accelerate delivery speed, deployment safety, and operational reliability.
  • Architect end-to-end automated UI and API test suites, build synthetic data generation tools, and develop front-end tools for vendor teams.
  • Drive enterprise observability, CI/CD pipelines, and infrastructure as code while mentoring engineers and serving as a technical liaison.

Focus is a digital services firm dedicated to delivering impactful projects in the civic tech space. They partner with government agencies to modernize systems and emphasize work-life balance, remote work, and cutting-edge tooling.

$145,500–$235,400/yr
US

  • Build and ship end-to-end product capabilities across frontend and backend systems.
  • Develop user experiences using TypeScript and React, along with services and APIs using Go, Python, or comparable tools.
  • Collaborate with Product, Design, Data, and engineering partners to balance usability, performance, reliability, and time to value.

LaunchDarkly provides a feature management platform that helps engineering teams ship software and AI with speed, safety, and control. They are a growing company that values humble, open, collaborative, and kind teams.

US Unlimited PTO

  • Build and maintain the core of our production platforms, spending most of your time hands on in the codebase.
  • Own architecture decisions, review pull requests and designs from earlier-career engineers, and mentor engineers early in their careers.
  • Develop across the full stack, partnering with IT Security and Data and Analytics to keep systems reliable and built to last.

We elevate patient access to healthcare by partnering with health systems to transform how patients access care. We're a team of experts obsessed with the connection between people, processes, and technology that make healthcare organizations hum.

Latin America

  • Architect and modernize frontend systems using React, TypeScript, and Tailwind CSS.
  • Own end-to-end delivery of complex frontend features from technical design to deployment.
  • Enforce engineering excellence through code reviews and mentor junior engineers.

CodeRoad is a technology execution partner that engineers, modernizes, and scales technology for companies across North America since 2002. The company fosters a high-trust culture with career continuity, engineering autonomy, and collaborative team environments.

$170,000–$200,000/yr
US Unlimited PTO

  • Set technical direction and own critical architectural decisions for the 340BCheck team.
  • Drive proactive refactoring and resolve the hardest technical problems across distributed systems.
  • Mentor senior engineers and improve team culture and execution.

Bluesight's mission is to empower customers to deliver the right medicine to the right patient at the right time. It is a high growth healthcare information technology company with a start-up vibe and over 3,000 customers.

India

  • Own the architecture of the platform UI, including the application shell, module federation topology, shared component library, and build tooling.
  • Define and enforce performance metrics, accessibility standards, and release strategies across the front-end ecosystem.
  • Provide technical leadership through design proposals, code reviews, and mentorship of senior and mid-level engineers.

HighLevel is an AI-powered business operating system for SMBs, providing infrastructure to build and scale across 150+ countries. With over 2,000 team members across 10+ countries, we operate as a global, remote-first organization built for speed, ownership, and people-first culture.

US

  • Own React feature development end-to-end, from design through release.
  • Improve automated quality gates across unit, integration, and E2E testing.
  • Mentor engineers and serve as a trusted technical partner to clients.

They build high-quality software products for a variety of client environments. The culture is collaborative, distributed, and fast-moving, with a focus on engineering standards and client partnerships.

Europe

  • Build and maintain product interfaces in TypeScript, React, TanStack Query, MaterialUI and BaseUI.
  • Translate product requirements into specs and design component APIs that stay readable and extendable.
  • Partner with product managers, designers, and backend engineers to shape APIs and improve user experience.

Plentific is a property technology platform that coordinates repairs, maintenance, and contractor workflows for housing providers across the UK and Germany. Headquartered in London with a remote team across Europe, it is expanding its platform and integrating AI throughout the product.

Global

  • Own and evolve the Kamino webapp built on React 19, TypeScript, and TanStack Start.
  • Build and ship features across lend/borrow, leverage, vaults liquidity, swap/limit orders, and portfolio.
  • Model complex server state with TanStack Query and client state with Zustand for real-time financial data.

Kamino builds the credit and liquidity engine for tokenized assets, operating the largest credit protocol on Solana with over $20 billion in loans originated. The company is expanding to New York and fosters a quality-focused, AI-native engineering culture.

  • Design, build, and ship full stack features for our digital health platform.
  • Own major parts of the codebase and lead project execution with cross-functional teams.
  • Write clean, tested, high-performance code while elevating engineering standards.

Nourish is an AI-native digital health system that matches patients with dietitians, physicians, medications, lab testing, and AI agents for insurance-covered care across all 50 states. Founded four years ago, it has completed millions of appointments, tripled yearly, and raised $215M, fostering a high-bar, no-ego culture.

Latin America

  • Build and maintain the dashboard in TypeScript and React, designing data-dense interfaces.
  • Integrate with back-end APIs, implement role-based access, and own performance and accessibility.
  • Write automated tests, review teammates' code, and collaborate with product and design.

Caliza is commercial banking infrastructure for cross-border companies, replacing banks and spreadsheets with one API. We're a remote fintech startup backed by top investors, with a team from Visa, Nubank, and EBANX.

US Unlimited PTO

  • Serve as the frontend technical lead for CMG's DataLab product, guiding architecture and best practices using React and TypeScript.
  • Collaborate with product managers and engineers to translate complex business requirements into clean, maintainable code.
  • Champion design consistency, accessibility, and product quality while leveraging modern agentic coding tools.

Capital Markets Gateway is a capital markets-focused fintech transforming global equity capital markets through data, technology, and connectivity. Founded in 2017, the company serves 25 global investment banks and 135 asset managers with $40 trillion in AUM, fostering a collaborative and innovative engineering culture.

US

  • Build customer workflows end to end, spanning data models, APIs, web interfaces, and mobile experiences.
  • Partner with product to shape technical plans, surface risks, and stage delivery in useful increments.
  • Own quality and operations, from tests and feature flags to monitoring and incident response.

Odin is a workforce visibility and compliance platform powering infrastructure projects like AI data centers and clean energy construction. We've grown over 7x from 2024 to 2025, and our team is scaling to meet accelerating demand.