Senior Backend Engineer — Ad Tech & Infra

Hybrid (2 days in office) - Bay Area, United States

Falcon Labs turns the post-transaction experience into an incremental revenue stream for online services and a rewarding moment for their customers. Our solution uses advanced technology and AI to deliver personalized, contextually relevant offers to consumers at their peak engagement moment, right after they complete a transaction.

The moment after a transaction is one of the most underutilized surfaces in commerce: intent is high, trust is established, and attention is real, yet for most brands it still ends with a static confirmation screen. We operate across major e-commerce ecosystems (Shopify, Wix, and a growing set of technology partnerships), earn a take rate on advertiser conversions, and run on real-time decisioning, Snowflake analytics, and an expanding push into agentic automation across the network.

We are a team of ad-tech veterans from the mobile advertising world (iron Source/Unity).

We're building ad-serving infrastructure from the ground up — not another CRUD app. You'll work on:

Ad Server: Real-time placement optimization and bidding logic serving millions of requests

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

Platform Integrations: Connecting with major e-commerce platforms (Shopify and others) and ad networks

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

Data Pipelines: ETL workflows feeding our analytics and optimization systems

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

Tooling: Yarn Work spaces, Jest, Sentry

AI-forward: AI is used across development, automation, and product

Build core systems

Architect and implement ad-serving infrastructure for real-time bidding

Design high-performance APIs with strict latency and throughput requirements

Build revenue tracking and analytics systems

Own complex backend problems

Manage database migrations, query optimization, and caching strategies

Implement third-party integrations with e-commerce and ad-tech partners

Build internal tools and automation workflows

Optimize PostgreSQL query plans and indexing strategies

Design caching layers and data access patterns for high-throughput workloads

Implement A/B testing infrastructure for ad placement optimization

Cross-functional impact

Work directly with founders and product team

Shape technical architecture and engineering practices

Mentor junior developers and contractors

Required

5+ years of backend development experience, preferably Node.js or Type Script

Strong PostgreSQL knowledge, including query optimization, indexing, and migrations

Production experience with cloud infrastructure, ideally AWS

API design experience including REST, webhooks, and third-party integrations

Ownership mindset, you identify problems and solve them

What we value

Sense of urgency, you ship fast without cutting corners

Adaptability, you thrive when priorities shift

AI-forward mindset, you actively use AI tools in your workflow

Strong opinions, loosely held

Systems thinking across databases, caches, queues, and services

Ad-tech experience such as RTB, DSPs, attribution, or affiliate marketing

Data engineering experience including ETL pipelines or Snowflake

Experience with our stack:
KeystoneJS, Prisma, PostgreSQL, AWS ECS

Competitive salary and meaningful equity

Early-stage company with real traction

echnical growth

Complex problems like real-time bidding and multi-tenant analytics

Ownership of major backend systems and architecture

Direct impact, your work will influence real revenue quickly

Culture and environment

Hybrid setup: 2 days in office, 3 days remote

Small team, high impact, no bureaucracy

Learning budget for conferences and courses

Technical founders who understand engineering trade-offs

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

Don't check every box? If you're passionate about ad-tech, backend systems, and building from scratch, reach out anyway.

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.