Senior Backend Engineer

Senior Backend EngineerHybrid (2 days in office) - Bay Area, United StatesAbout FalconFalcon 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 (ironSource/Unity).The ChallengeWe'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 requestsInfrastructure at Scale: PostgreSQL optimization, Redis caching, AWS ECS orchestrationPlatform Integrations: Connecting with major e-commerce platforms (Shopify and others) and ad networksAnalytics Engine: Time-series data processing with multi-dimensional revenue reportingData Pipelines: ETL workflows feeding our analytics and optimization systemsOur Tech StackBackend: KeystoneJS 6, Node.js, PostgreSQL 16, Redis, Prisma ORMInfrastructure: AWS ECS, Terraform, Docker, Application Load BalancerData: Snowflake, n8n automation workflowsTooling: Yarn Workspaces, Jest, SentryAI-forward: AI is used across development, automation, and productWhat You'll DoBuild core systemsArchitect and implement ad-serving infrastructure for real-time biddingDesign high-performance APIs with strict latency and throughput requirementsBuild revenue tracking and analytics systemsOwn complex backend problemsManage database migrations, query optimization, and caching strategiesImplement third-party integrations with e-commerce and ad-tech partnersBuild internal tools and automation workflowsData-driven developmentOptimize PostgreSQL query plans and indexing strategiesDesign caching layers and data access patterns for high-throughput workloadsImplement A/B testing infrastructure for ad placement optimizationCross-functional impactWork directly with founders and product teamShape technical architecture and engineering practicesMentor junior developers and contractorsWho We're Looking ForRequired5+ years of backend development experience, preferably Node.js or TypeScriptStrong PostgreSQL knowledge, including query optimization, indexing, and migrationsProduction experience with cloud infrastructure, ideally AWSAPI design experience including REST, webhooks, and third-party integrationsOwnership mindset, you identify problems and solve themWhat we valueSense of urgency, you ship fast without cutting cornersAdaptability, you thrive when priorities shiftAI-forward mindset, you actively use AI tools in your workflowStrong opinions, loosely heldSystems thinking across databases, caches, queues, and servicesBonus pointsAd-tech experience such as RTB, DSPs, attribution, or affiliate marketingData engineering experience including ETL pipelines or SnowflakeExperience with our stack: KeystoneJS, Prisma, PostgreSQL, AWS ECSWhy Join Falcon?Financial upsideCompetitive salary and meaningful equityEarly-stage company with real tractionTechnical growthComplex problems like real-time bidding and multi-tenant analyticsAI-first development cultureOwnership of major backend systems and architectureDirect impact, your work will influence real revenue quicklyCulture and environmentHybrid setup: 2 days in office, 3 days remoteSmall team, high impact, no bureaucracyLearning budget for conferences and coursesTechnical founders who understand engineering trade-offsReady?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.How to ApplySend your CV and a short cover note to:View email address on click.appcast.io