Backend Engineer - Node.js / TypeScript

Location: Remote| Full-Time

Our hiring partner is pioneering a platform backed by $14M from top-tier investors, enabling enterprises to deploy authenticated AI agents for mission-critical workflows.

Underdog.io is a modern recruiting platform. This role is being filled through Underdog.io — a invite-only network of vetted startups and high-growth companies. You won't go through a staffing agency or get passed around. Your resume goes directly to our hiring team and is reviewed by a real human. Your profile is completely confidential. If there's a good fit, you'll hear from us directly — no middleman, no black hole.

Their technology solves a fundamental challenge: securely accessing and transforming data trapped behind complex authentication barriers. We’ve automated weeks-long manual processes into minutes for industry leaders. Join our growing team to build the infrastructure that makes every business system AI-accessible.

Your Mission

Architect core systems that allow AI agents to securely navigate authenticated environments—from dynamic web interfaces to legacy systems—transforming unstructured data into actionable intelligence at scale.

Key Responsibilities

1. Build Resilient AI Agents: Develop systems that automate complex logins (including MFA), extract unstructured data, and handle dynamic web interfaces without APIs.
2. Engineer Secure Foundations: Create authentication workflows for diverse platforms and scalable APIs for enterprise-grade solutions.
3. Design Data Infrastructure: Implement GCP-based data pipelines, optimize PostgreSQL performance, and ensure integrity for millions of records.
4. Ship End-to-End Systems: Develop third-party integrations, testing suites, and observability tools with a focus on reliability.
5. Collaborate Strategically: Work with senior engineers on system architecture and product teams to solve real customer challenges.

Tech Stack Deep Dive

1. Core: TypeScript, Node.js, PostgreSQL, Python
2. Infra: GCP, Docker, GitHub Actions (CI/CD)
3. Automation: Custom web agents, Puppeteer/Playwright (experience a plus)

Who You Are

1. 3+ years backend engineering experience shipping production systems.

Technical Mastery:

1. Proficient in modern backends (Node.js/TypeScript preferred)
2. Experience with REST APIs, cloud platforms (GCP/AWS/Azure), and databases
3. Familiarity with containerization (Docker) and CI/CD pipelines

Cultural Fit:

1. Autonomy: Own outcomes end-to-end in ambiguous environments
2. Craftsmanship: Balance best practices with pragmatic delivery
3. Curiosity: Continuously explore authentication, security, and AI/automation
4. Communication: Document decisions and align cross-functional teams

Nice-to-Haves

1. Data engineering/ETL pipeline experience
2. Knowledge of OAuth, SAML, or security protocols
3. Startup experience or open-source contributions
4. Monitoring tools (Prometheus, Grafana, etc.)

Why Join

1. Impact Critical Infrastructure: Your code enables AI to access 90% of enterprise data currently locked behind logins.
2. Founder-Level Equity: Significant ownership in a well-funded startup.
3. Elite Team: Learn from former founders and early engineers who scaled 0→1 products.

For Builders of the AI-Authenticated Future

If you’re driven to solve foundational challenges at the intersection of security, AI, and enterprise systems—apply now. Let’s make every business system AI-accessible.

Must be authorized to work in the U.S. No visa sponsorship.

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