Senior Backend Engineer
Hybrid (2 days in office) - Bay Area, United States
About Falcon
Falcon Labs is a checkout marketing platform that specializes in transforming the post-purchase experience into a powerful customer engagement and discovery opportunity.
Our solution uses advanced technology and AI to deliver personalized, contextually relevant offers to consumers at their peak engagement moment.
By optimizing the customer journey with tailored recommendations during check-out, we enable businesses to unlock incremental revenue streams while enhancing customer satisfaction through a rewarding user experience.
We are a team of ad-tech veterans with vast experience building advertising tools in the mobile advertising space (ironSource/Unity), excited to bring machine learning, ad targeting and ROAS capabilities to boost e-commerce businesses.
The Challenge
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
Our Tech Stack
Backend: KeystoneJS 6, Node.js, PostgreSQL 16, Redis, Prisma ORM
Infrastructure: AWS ECS, Terraform, Docker, Application Load Balancer
Data: Snowflake, n8n automation workflows
Tooling: Yarn Workspaces, Jest, Sentry
AI-forward: AI is used across development, automation, and product
What You'll Do
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
Data-driven development
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
Who We're Looking For
Required
5+ years of backend development experience, preferably Node.js or TypeScript
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
Bonus points
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
Why Join Falcon?
Financial upside
Competitive salary and meaningful equity
Early-stage company with real traction
echnical growth
Complex problems like real-time bidding and multi-tenant analytics
AI-first development culture
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
Ready?
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.
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