Headspace is hiring a Staff Software Engineer, Mobile to lead complex cross-functional mobile projects, architect scalable enrollment and content systems, define mobile platform patterns (server-driven UI, observability, experimentation), and mentor engineers. The role emphasizes Flutter (2+ years), native Android/iOS (4+ years), mobile architecture patterns (MVC/MVVM), comprehensive testing (unit/integration/end-to-end), and use of AI-assisted development tools. The position is open to candidates residing in the United States with preferred locations in San Francisco (hybrid), New York City (remote), and Seattle (remote).

EnergyHub seeks a Senior Software Engineer for the Client Connections team to design and implement backend services and client-facing REST APIs, integrate with distributed services, ensure security and monitoring, and collaborate with product and engineering. Requires 5+ years of professional software engineering experience, strong Java/Spring expertise, REST API experience, and familiarity with PostgreSQL, CI/CD, and modern security practices.

Join MetaMask's application security team to embed security across the software development lifecycle. Responsibilities include threat modeling, security design reviews, vulnerability assessment and triage (including bug bounty reports), code fixes, developing security automation and AI tooling, and collaborating with distributed engineering teams. Familiarity with blockchain/Ethereum, crypto wallets, and JavaScript-based stacks (Node.js, React, React Native) is required.

Join CrowdStrike's Product Security team to perform technical security assessments, design and deploy tooling and controls for software build pipelines (including signing), harden open source usage and system configurations, monitor for vulnerabilities/anomalies, and lead cross-cutting security initiatives. Required skills include Linux/Unix administration, scripting (shell, Python, Go, JavaScript), CI/CD tools (e.g., Jenkins, Argo CD), TLS/PKI/signing knowledge, system hardening, and experience with monitoring/log aggregation and cloud platforms. Position is remote for U.S. candidates; listed U.S. base salary range is $120k–$180k/year.

Lead a small, agile full-stack engineering team to deliver mission-critical capabilities for U.S. national security customers on the Mattermost platform. Hands-on ownership across frontend (React), backend (Go, Node.js), architecture, testing, and release. Customer-facing role that requires translating field requirements into engineering work, maintaining engineering standards for defense environments, and adopting AI/LLM tools to improve productivity. Requires 5+ years of professional software engineering experience (2+ years in a lead/management role), U.S. citizenship, and travel ~1-2 weeks per quarter; active Secret clearance preferred.

Staff-level engineering role responsible for designing, developing, and maintaining backend services and scalable APIs using technologies including Go, Node/TypeScript, GraphQL, and PostgreSQL. Role involves CI/CD, AWS (Lambda, Fargate), containerization (Docker, Kubernetes), troubleshooting production issues, producing technical design documentation, and mentoring junior engineers. Requires BS or advanced degree in computer science or equivalent experience and 8-12 years of software development experience.

Hiring a software engineer to develop backend services and tooling across Fraud, User & Identity Management, and Identity. Responsibilities include detection and prevention systems, enforcement actions (locks, freezes), protections against account takeover, observability, and partnering with fraud, security, product, and data teams to reduce loss and improve account security.

Join Juno (part of Ramp) as a full‑stack Software Engineer focused on guest travel: build the booking experience, coordination tools for travel managers, and payment/expense infrastructure (virtual cards, spend controls, receipt verification, reimbursements). Work across frontend and backend, ship AI-powered agents to automate coordination, and integrate with third‑party payment and booking APIs. Preferred: 4+ years professional experience and proficiency with TypeScript, React, and PostgreSQL.

Ashby is hiring a Senior Product Engineer for US-remote candidates to take ownership of large product areas and deliver end-to-end features. The role involves writing product specs, wireframing, prototyping, and building across the stack using technologies such as TypeScript, React, GraphQL, Node.js, Postgres, and Redis. The team meets in person at least twice a year.

Ashby is hiring a Staff Product Engineer to own large product areas end-to-end: researching customers and competitors, writing product specs, designing wireframes, and implementing solutions across the stack. The role emphasizes TypeScript/React/GraphQL/Node.js experience, building reusable platform building blocks (design system, query/analytics/policy engines), strong product thinking, and working in a fast-deploying CI/CD environment. The position is remote for US-based candidates.

Senior-level Design Engineer role focused on both visual/product design and hands-on implementation. Responsibilities include redesigning product surfaces, expanding and implementing the in-house design system, shipping features end-to-end, and collaborating closely with product and engineering. Tech stack includes TypeScript, React, GraphQL, Node.js, Postgres, and Redis. Role is remote within the US and works on a product with large-scale usage.

Senior individual contributor role (8+ years) focused on technical leadership for Reddit's Home feed on Android: design and implement Android architecture, drive developer workflow improvements, collaborate with product/design/ML teams, own experimentation and metrics, and mentor engineers. Remote within the United States, Canada, or Europe; hybrid near listed offices is also possible.

Twilio is hiring an entry-level/junior Full Stack Software Engineer (L1) to join the Messaging and Email experience team (remote - US). Responsibilities include designing, developing, deploying and operating full-stack software and APIs at scale, supporting production and on-call activities, performing code reviews, and creating documentation. Required experience: building scalable software systems (distributed systems/infrastructure), web applications, and RESTful services. Cloud platform experience (AWS, Azure, GCP), configuration management, and deployment system experience are listed as desired.

Design and build core security primitives and services protecting MongoDB Atlas compute, networking, and identity across AWS, Azure, and GCP. Use Linux security mechanisms (AppArmor, SELinux, seccomp, cgroups), Kubernetes, and eBPF; develop APIs, automation, and tooling for CSPM, vulnerability management, and monitoring/logging pipelines; integrate security into CI/CD and Terraform. Requires 5+ years in software/SRE/security engineering and proficiency in at least one language (Java, Golang, Rust, Python, or C/C++). Role based in NYC, Austin, Seattle, San Francisco or fully remote on East Coast business hours.

Join Reddit's Machine Learning Platform team to design, implement, and operate a large-scale GenAI platform and LLM Gateway. Responsibilities include building RAG applications (embeddings, vector search, retrieval), implementing agentic AI workflows (e.g., LangChain/LangGraph), driving MLOps/LLMOps practices (CI/CD, versioning, testing), and establishing observability/monitoring and governance for production GenAI pipelines. The role expects experience with cloud infrastructure (AWS, GCS), Kubernetes, infrastructure-as-code (Terraform), and strong proficiency in Python and/or Go.

Work on the core AI tutoring system including prompt architectures, agentic workflows, real-time adaptive behaviors, experimentation and custom evaluation metrics. Role requires production software engineering (Python), cloud and CI/CD experience, and 1+ years building complex LLM-based systems; collaborate with educators and product teams to translate pedagogical goals into technical solutions.

EnergyHub seeks a hands-on Software Architect to drive migration to distributed architecture (using DDD and related patterns), define and lead an internal developer platform, apply organizational design (Conway's Law / Inverse Conway Maneuver), mentor senior engineers, and quantify technical debt and TCO for build vs. buy decisions. Position is remote in the United States; employer does not sponsor immigration.

Work on Reddit's high-traffic Feeds pages building front-end features and products. Collaborate with product, design, and backend engineers; own full development lifecycle (design, development, testing, experimentation, launch). Requires 6+ years of software development with front-end languages/frameworks (JavaScript, TypeScript, React/Vue/Angular/LIT/Polymer) and experience with CSS; familiarity with GraphQL/REST/HTTP/Thrift, large-scale web application considerations, observability, and experimentation is a plus.

Senior-level engineering role on Datadog's Cloud FinOps team focused on designing scalable platforms and models to provide visibility into cloud infrastructure costs (AWS, GCP, Azure), enable cost attribution and forecasting, and influence company-wide decisions on infrastructure and AI usage. Hybrid role based in New York with cross-functional collaboration across Finance, Engineering, and executive leadership.

Mozilla is hiring a contractor to ship working tools, demos, and reference implementations for Harbor and related open-source AI tooling. The role focuses on browser extension and SDK work (WebAgents API), MCP servers, local inference, permission/capability design, and engaging in standards work (WICG/W3C) while producing clear code and documentation for public consumption.