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Senior/Staff Software Engineer (Full-Stack Engineer)

Actively AI· Engineering
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New York, NY$160k - $210kFull-timePosted 6mo ago

About the role

Senior/Staff Full Stack Engineer to architect and build foundational systems for Actively’s AI Agents, spanning Python/FastAPI backends and React/TypeScript UIs, with ownership of core product experiences, platform architecture, and real-time workflows.

Responsibilities

  • Own end-to-end features. Design, build, and ship customer-facing experiences across the stack, from Python/FastAPI services and background workers to polished React/TypeScript UIs.
  • Define Actively’s product platform. Architect the frameworks, patterns, and shared product components that make every product surface fast, consistent, and cohesive.
  • Design and prototype intelligent AI interactions. Collaborate with agent SDKs and internal frameworks to build new user experiences for configuring, debugging, and collaborating with agents including conversational interfaces, feedback loops, and workflow builders.
  • Build for real usage at scale. Operate across the full stack to ensure high performance, reliability, and seamless data flow, working across SQL/NoSQL stores, caching layers, and task execution pipelines, and contributing to backend systems where needed to deliver a cohesive end-to-end experience.
  • Customer-driven iteration. Work directly with customers and alongside other teams to translate real feedback and behavior into simple, easy-to-use experiences, experimenting and refining quickly based on what customers actually need.

Qualifications

  • 5+ years of experience building and shipping high-impact, customer-facing products end-to-end — from backend APIs to refined UI experiences.
  • Frontend-strong, backend-capable. Deep experience with React, TypeScript, and modern web frameworks; comfortable with Python/FastAPI backends.
  • A systems thinker with focus on type safety, API contracts, and shared platform primitives.
  • Iterative by nature with fast feedback loops and customer insight.
  • Grounded and self-directed with ability to make architectural and product calls and own outcomes end-to-end.
  • Experience shipping AI-powered products and turning LLM capabilities into user-facing experiences.

Skills

Required:PythonFastAPIReactTypeScriptSystem design

Benefits

  • Competitive Early-Stage Equity
  • Health, Dental, Vision Coverage
  • Unlimited PTO + Recharge Days
  • Catered Lunch on Tuesday & Friday, Dinners every day
  • Fully Stocked Kitchen
  • Cutting-Edge Tech & Tools
  • Annual Off-sites & Monthly Events
  • Commuter Benefits
  • Cozy Office in NYC
Last updated Jul 15, 2026. Interested? Apply on the company site.

About Actively AI

GTM Superintelligence to Maximize Revenue

Actively AI is GTM superintelligence built to boost revenue per rep. The world’s most innovative revenue teams use our per-account agents to power next-best actions across their entire TAM and scale AI-driven growth.

GTM superintelligenceAI-driven growthper-account agentsenterprise-scale GTM
Company profileWebsite

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