About Actively
Actively is building superintelligence for GTM teams. We train custom reasoning agents to think like a company’s best sales reps, and then use them to evaluate millions of datapoint about every single prospect account in the company’s TAM to feed their sales reps the optimal actions to take every day to maximize revenue.
Our customers include some of the fastest-growing companies out there — Ramp, Verkada, Justworks, Ironclad, etc. — for whom we’ve driven hundreds of millions of dollars in added revenue in the past year.
We’ve raised over $22.5M in funding, including a recent Series A led by Bain Capital Ventures
About the Role:
We're looking for a
Senior Full-Stack Engineer to own the product surface area around our AI agents to make them configurable, explainable, and powerful at scale. Historically, our system has been
headless, meaning that we push all of the real-time recommendations it makes into the workflow systems (like Salesforce or Outreach) where users live today. However, we're increasingly excited about building our own interfaces where users can train and edit model configuration, deep dive into the reasoning process of our agents, and even give feedback to our system to collaboratively improve it over time.
This is a critical, high-leverage, n-of-1 role for someone who loves digging into messy user problems, building production-grade full-stack applications, and owning end-to-end product experiences — and is excited about the opportunity to build software that enables a future where humans collaborate with agentic systems to achieve better outcomes than either could on their own.
You'll work very closely with our founders, the rest of the engineering team, and our GTM and CS teams to ship high-quality, user-friendly product and drive real revenue (for us and for customers!).
What You'll Do
- Design & ship customer-facing product surfaces. Own our full-stack app end-to-end — from the PRD to the React / TypeScript UIs to the APIs and data models that back them.
- Expose our reasoning agents. Build interfaces for sales reps and RevOps teams to train, tweak, and trust Actively’s multi-agent system.
- Level-up onboarding & self-serve. Automate user/account provisioning, routing rules, and environment deployment so Customer Success can launch new customers in hours, not days.
- Make hard things debuggable. Create internal and external tools that surface agent decisions and trace data flow in one click.
- Build the full-stack team & raise the engineering bar. Propose architecture patterns, own technical debt pay-down, and help hire, onboard, and mentor new full-stack engineers as we grow the team.
What a Typical Week Might Look Like
- Shipping a UI + backend logic update that helps RevOps teams visualize and adjust rep routing logic
- Pairing with an FDE on a customer onboarding issue, then building internal tooling to streamline that experience
- Designing an "agent replay" interface that exposes the multi-step reasoning process of our AI system to users to build trust and solicit feedback
- Building a dashboard that makes our ROI clear to customers
Who You Are
- Full-Stack Expert – 3+ years of experience building user-facing frontends and backend systems that power them. You can own APIs, data models, and system design and build clean UIs using modern frontend frameworks (e.g. React/TypeScript).
- Deeply Product-Minded – You care about user workflows, UX clarity, and building interfaces that make complex things simple. You love talking to customers to figure out what to build and iterate. No PM hand-holding — just a hard problem, a tight feedback loop with customers, and freedom to run.
- LLM-Curious – You’re interested in how AI and human-in-the-loop workflows can come together — and want to build new interfaces to make this possible.
- Execution-Oriented – You bias toward action, ship fast, and improve quickly based on feedback.
Bonus Points
- Prior experience in an early-stage startup or as a founder.
- Familiarity with sales tech (e.g. Salesforce, Outreach, Gong) and/or GTM workflows.
- Experience building with LLMs and AI agents
- Strong intuition for building usable interfaces with a "low floor and high ceiling" for a variety of user personas
Benefits:
- 🚀 Competitive Early-Stage Equity
- ⚕ Health, Dental, Vision Coverage
- 💡 Unlimited PTO + Recharge Days
- 🍽️ Catered Lunch on Tuesday & Friday w/ Dinners Everyday!
- 🍿 Fully Stock Kitchen
- 💻 Cutting-Edge Tech & Tools
- 🌴 Annual Off-sites & Monthly Events
- 🚆 Commuter Benefits
- 🏢 Cozy Office in NYC
