Actively AI

Senior/Staff Software Engineer (Full-Stack Engineer)

New York, New York, United States · Staff+

Sponsorship not specified$160k-$210kDetected 29 days ago

TypeScriptPythonReactFastAPIFull-Stack DevelopmentSQLNoSQLLLMsAgentic AISalesforceResearchCollaboration

About the role

For most of Actively's history, our intelligence has run quietly in the background, wired into Salesforce, Outreach, and the tools your customers already use.
You'll prototype new agent interactions, run experiments, and work directly with customers to make complex AI behavior feel natural and trustworthy.
For more on how we think about human-agent collaboration, see our blog post.

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.
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.
Product-minded and design-curious. You care about usability, polish, and the emotional feel of software as much as the systems behind it.
A systems thinker. You recognize the patterns behind good architecture and design frameworks that help others move faster without sacrificing quality. You think in terms of type safety, API contracts, and shared platform primitives.
You've operated in a mode where you decided what to build, how to build it, and why it mattered.
You stay current on the ecosystem because you're building with it, not just watching it.

You have 5+ years of experience building and shipping high-impact, customer-facing products end-to-end - from backend APIs to refined UI experiences.
You have deep experience with React, TypeScript, and modern web frameworks, and you're comfortable working in Python/FastAPI backends to craft seamless full-stack flows.
Experience as an early or founding engineer, where you owned architecture, product calls, and shipping and not just execution
Actively AI provides an estimate of the compensation for roles that may be hired as required by state regulations.

may vary based on (a) location, as Actively AI factors in specific location when benchmarking compensation for most roles; (b) individual candidate skills and qualifications; and (c) individual candidate experience.
Additionally, Actively AI leverages current market data to determine compensation, so posted compensation figures are subject to change as new market data becomes available.
The salary, other compensation, and benefits information is accurate as of the date of this posting.
Actively.ai reserves the right to modify this information at any time, subject to applicable law.
$160,000 - $210,000 USD
At Actively, you write playbooks rather than follow them.
🌴 Annual Off-sites & Monthly Events

🚀 Competitive Early-Stage Equity
⚕ Health, Dental, Vision Coverage
💡 Unlimited PTO + Recharge Days
🚆 Commuter Benefits
building, learning, and refining quickly based on real-world use and customer insight.

Intelligence-Led Revenue.
Revenue organizations have always been bottlenecked on human capacity.
Reps triage which accounts get attention.
Context disappears at every handoff.
On any given day, the vast majority of accounts have exactly zero people thinking about them.
Actively addresses this at the structural level.
Our platform deploys Per-Account AgentsTM across our customers' TAM, working 24/7 to research, identify opportunities, and advance next steps without being asked.
Leading enterprises including Ramp, Ironclad, and Samsara are already making this shift.
Our co-founders are former Stanford AI researchers, and the team comes from Harvard, CMU, Berkeley, Brex, Scale AI, and Google.
We've raised $68M from TCV, First Harmonic, Bain Capital Ventures, First Round Capital, and more.
people who work from first principles, move with urgency, and care deeply about building something that drives real value.
If that's the kind of challenge you're looking for, Actively is the right place.
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.

Actively AI is an equal opportunity employer; committed to a community of inclusion, and an environment free from discrimination, harassment, and retaliation.

This listing is sourced directly from Actively AI's careers page and normalized into a canonical job model.