Full Stack Engineer

Underdog: Verified engineers. Interview-ready. Searching confidentially. And companies apply to you; New York (NY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

Founder-tier equity

Hybrid work model

Job summary

Underdog is hiring a Founding Full-Stack Engineer in NYC. You will shape the customer-facing portal, internal tools, and backend services as we scale from ground zero.

You will collaborate with security and infrastructure teams to turn complex workflows into secure, scalable experiences using React, Next.js, TypeScript, Node.js, and PostgreSQL. Early-stage, equity included.

Qualifications

• 3+ years as a full-stack engineer shipping production systems.
• Frontend mastery: React, Next.js, TypeScript.
• Core understanding: Web architecture, auth (OAuth/SAML), CI/CD, and testing.
• Startup mindset: Thrives in ambiguity, owns outcomes, and iterates rapidly.

Responsibilities

• Build responsive web apps (React, Next.js, TypeScript) for developers and enterprise users.
• Design & optimize APIs and backend services (Node.js, PostgreSQL).
• Expose infrastructure pipelines (build orchestration, artifact distribution) via UI/APIs.

Skills

Full-stack development

React

Next.js

TypeScript

OAuth/SAML

CI/CD

Testing

Startup mindset

Tools

Node.js

PostgreSQL

Job description

Founding Full-Stack Engineer (NYC – Hybrid)

Location: New York City, NY

Our hiring partner is a pioneering cybersecurity startup that recently secured Series A funding, and are on a mission is to eliminate systemic risks in critical infrastructure—from energy grids to space systems—by transforming how software is hardened at scale. Today’s software supply chains produce uniform binaries, creating a single point of failure for entire fleets. We break this vulnerability by engineering intelligent variability directly into the compilation process. Our technology disrupts attacker economics and massively increases exploitation costs, ensuring resilience for large-scale deployments.

To achieve this, we orchestrate thousands of parallel compiler runs across distributed systems. We’re now building our greenfield backend platform from scratch—scaling build orchestration, secure artifact distribution, and performance analytics. Join us at ground zero to architect the future of resilient software.

Your Impact

As a Founding Full-Stack Engineer, you’ll shape our customer-facing portal, internal tools, and backend services. You’ll collaborate with infrastructure and security teams to turn complex workflows into intuitive, secure experiences. Your code will empower enterprises to manage diversified builds, analyze security metrics, and safeguard critical systems worldwide.

Responsibilities

• Build responsive web apps (React, Next.js, TypeScript) for developers and enterprise users.
• Design & optimize APIs and backend services (Node.js, PostgreSQL).
• Expose infrastructure pipelines (build orchestration, artifact distribution) via UI/APIs.
• Ship end-to-end features across the stack, from dashboards to access controls.
• Embed security and usability into customer tools and internal platforms.
• Co-define architecture and drive technical decisions in early-stage development.

Required Expertise

• 3+ years as a full-stack engineer shipping production systems.
• Frontend mastery: React, Next.js, TypeScript.
• Core understanding: Web architecture, auth (OAuth/SAML), CI/CD, and testing.
• Startup mindset: Thrives in ambiguity, owns outcomes, and iterates rapidly.

Nice-to-Haves

• Exposure to compilers (LLVM), embedded systems, or low-level toolchains.
• Background in security engineering, multi-tenant SaaS, or B2B developer tools.
• Passion for securing critical infrastructure (robotics, energy, transportation, edge).

Why Join?

• Founder-tier equity + competitive salary.
• Build the foundation: Define our tech stack, culture, and product vision.
• Impact resilience in space, energy, transportation, and beyond.
• Global collaboration: Hybrid/on-site in NYC with teams in Germany and the U.S.
• Work with veterans: An ambitious, mission-driven founding team with deep domain expertise.