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Senior Software Engineer

Hybrid of remote and 2 days in the office - Bay Area, United States

About Falcon Labs

Falcon is revolutionizing e-commerce advertising by connecting post-purchase shoppers with relevant cross-sell opportunities. We're building the infrastructure that powers promotional advertisements for shoppers who just completed a purchase on one site, seamlessly connecting them to complementary products on partner sites.

We're a seed-stage company solving 0-to-1 challenges in ad-tech, and we need someone who thrives in this environment.

The Challenge

We're not just building another web app—we're constructing sophisticated ad-serving infrastructure from the ground up. Think real-time bidding systems, multi-tenant analytics platforms, and high-performance APIs that handle millions of requests. You'll be working on problems like:

  • Building an Ad Server: Real-time placement optimization and bidding logic

  • Infrastructure at Scale: PostgreSQL optimization, Redis caching, AWS ECS orchestration

  • Complex Integrations: Connecting with major e-commerce platforms and ad networks

  • Analytics Engine: Time-series data processing with multi-dimensional reporting

  • Cross-Origin Systems: Secure iframe communication and SDK development

Our Tech Stack (Modern & Cutting-Edge)

Backend: KeystoneJS 6, Node.js, PostgreSQL 16, Redis, Prisma ORM

Frontend: Next.js 15, React 19, TypeScript, Tailwind CSS, Radix UI

Infrastructure: AWS ECS, Terraform, Docker, Application Load Balancer

Tooling: Yarn Workspaces, Jest, Playwright, Task Runner, Sentry

AI-Forward: We use AI extensively across development, automation (n8n), product management, and marketing

What You'll Do

Build from Scratch

  • Architect and implement core ad-serving infrastructure

  • Design high-performance APIs that handle real-time bidding

  • Create sophisticated analytics systems for revenue tracking


Own Complex Systems

  • Manage database migrations and performance optimization

  • Implement third-party integrations with major partners

  • Build developer tools and automation workflows


Data-Driven Development

  • Create comprehensive analytics dashboards

  • Optimize queries and caching strategies

  • Implement A/B testing frameworks


Cross-Functional Impact

  • Work directly with founders and product team

  • Shape technical architecture and engineering culture

  • Mentor junior developers and contractors

Who We're Looking For

Core Requirements

  • 5+ years of full-stack development experience

  • Expert-level TypeScript/JavaScript and modern frameworks

  • Production experience with PostgreSQL, APIs, and cloud infrastructure

  • Ownership mindset - you see problems and solve them without being asked


Startup DNA

  • Sense of urgency - you understand that speed and quality aren't mutually exclusive

  • Adaptability - you thrive when priorities shift and requirements evolve

  • AI enthusiast - you see AI-driven development as essential, not optional

  • Disagree and commit - you voice opinions then align with team decisions

  • Multitasker - you can context-switch between infrastructure, frontend, and business logic


Technical Edge

  • Bleeding-edge curious - you experiment with new technologies and share learnings

  • Data-driven - you make decisions based on metrics, not assumptions

  • Systems thinker - you understand how pieces fit together at scale


Bonus Points

  • Ad-tech experience - you understand RTB, DSPs, attribution, or affiliate marketing

  • Data engineering - you've built ETL pipelines, analytics systems, or data warehouses

  • Our exact stack - KeystoneJS, Next.js, PostgreSQL, AWS infrastructure

Why Join Falcon?

Financial Upside

  • Competitive salary + meaningful equity package

  • Ground floor opportunity at a seed-stage company with serious traction


Technical Growth

  • Work on genuinely complex problems that most engineers never see

  • AI-first development culture where you'll be encouraged to leverage cutting-edge tools

  • Full ownership of major systems and architectural decisions

  • Direct impact - your code will handle millions in revenue within months


Culture & Environment

  • Hybrid flexibility - 2 days in office for collaboration, 3 days remote for focus

  • Small team, big impact - no bureaucracy, just building

  • Learning budget for conferences, courses, and experimental projects

  • Work with founders who are technical and understand engineering challenges


Mission-Driven

  • We're not just optimizing ad clicks—we're creating value for shoppers by connecting them with products they actually want, when they're most likely to buy. It's advertising that doesn't feel like advertising.

Ready to Build the Future of E-Commerce Advertising?

If you're a senior engineer who gets excited about technical challenges, wants ownership over critical systems, and thrives in a fast-paced startup environment, we want to hear from you.

Even if you don't check every box, but you're passionate about ad-tech, AI-driven development, and 0-to-1 challenges, please reach out.

Falcon is an equal opportunity employer committed to diversity and inclusion. We welcome applications from all qualified candidates regardless of race, gender, age, religion, sexual orientation, or disability status.

Falcon is an equal opportunity employer committed to diversity and inclusion. We welcome applications from all qualified candidates regardless of race, gender, age, religion, sexual orientation, or disability status.

Falcon is an equal opportunity employer committed to diversity and inclusion. We welcome applications from all qualified candidates regardless of race, gender, age, religion, sexual orientation, or disability status.

Send CV and Cover Letter to:

jobs@falconlabs.us

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