Well-funded AI orchestration startup
Jack helps you find life-changing roles at companies like 
Cofounder
Jack scans 15 million jobs daily and introduces you directly to hiring managers.
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Open roles at Cofounder
Talk to Jack and he’ll help you get considered for the roles below, or anything else that fits what you’re looking for.
Full-Stack Engineer
New York, United States$225k-$300k + Equity
We’re seeking a high-agency Full-Stack Engineer to own features end-to-end on a modern TypeScript stack for an AI agent orchestration platform. The role is with a small, elite team in New York at a confidential, well-funded AI startup. This is an opportunity to shape autonomous workflows at scale and participate in equity as part of the package.
Posted 2w ago
Data Scientist
New York City, United StatesNot Disclosed + Equity
Join cofounder.co as the first Data Scientist in New York, defining the ML function and shipping production systems processing 18B+ tokens monthly. The company is building an AI agent orchestration platform backed by $8.7M from Union Square Ventures and Acrew Capital. This equity opportunity lets a Python expert with NLP/LLM experience own a domain from zero to one.
Posted 2w ago
Senior Product Designer
San Francisco, United States$160k-$220k + Equity
As a Senior Product Designer, you will build the core orchestration flows that enable solo founders to manage AI agents through natural language. This role is with a well-funded confidential AI startup in San Francisco, CA, backed by top-tier venture capital. The 0-to-1 opportunity offers substantial ownership and a chance to define how humans interact with autonomous systems.
Posted 2w ago
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.I get to know what you’re great at, then find roles you’d never find yourself.
I recruit from Jack’s network and make the intro when I spot a great match.I recruit from Jack’s network and make the intro when I spot a great match.
Everything you need
to land your next job
New matches
just now
Principal Engineer
93%Payments Infra · Remote · $320–400k
High-reliability systems
Head of Engineering
96%Series B Healthtech · London · £160–220k
Scaling eng orgs 10–40
Engineering Lead
91%AI Safety · SF · $300–380k
ML infra + team leadership
Staff Engineer
94%Frontend Platform · Remote · $280–350k
Next.js + edge infra
Senior Backend Engineer
98%Digital Banking · London · £130–180k
Distributed systems + fintech
Job Search On Autopilot
Jack gets to know you through a conversation and searches 15 million jobs daily. You tell Jack yes or no, and he gets smarter about what you’re looking for with each response.
0:00
JackTell me about a technical migration you led under time pressure.
0:02
I led a six-week migration of 40 services in three phases. We aligned stakeholders early and shipped two days ahead with zero downtime.
Confidence score
Strong: Clear structure, specific metrics
Improve: Add stakeholder conflict detail
Mock Interviews
Run a mock interview with Jack and get specific feedback on your stories, clarity, and answers to the hard questions. You’ll walk in with a tighter narrative and fewer surprises.
Salary Benchmark
Market 50th$155k
Your target$105k
Market 90th$220k
Base
$155k
Equity
$40k
Bonus
$15k
Based on Senior Engineer roles in London, Series A-B startups.
Salary Benchmarking
Jack shows you what ‘good’ looks like for your role, level, and location based on thousands of real jobs to inform your negotiation.
0:00
JackI’ve been a senior engineer for 3 years. Should I push for Staff or move into management?
That’s the right question to ask at this stage.
Let’s compare both paths: compensation, day-to-day work, and long-term fit.
First, what energised you more this year: technical problem-solving or people leadership?
Career Clarity Coaching
Jack helps you get clear on what you want next, what you’re great at, and what kind of work will actually fulfil you. In one coaching call, you’ll shape your career plan with Jack’s help.
0:00
JackCall Ended0:00
Employer
“We can offer $128,000 base salary.”
Jack
Below P50. Counter at $148k: they’ve run 4 rounds, they won’t walk.
You said
$148,000
Accepted
+$20,000Salary Negotiation Coaching
Jack helps you build a negotiation plan with data and specific language you can use. Know when to push, what to ask for, and how to respond without damaging the relationship.
Introduction
Jack made an introduction
Marcus, CTO at Acme, wants to chat about the Founding Engineer role. He liked your distributed systems experience.
Founding Engineer$180–240kLondon
Accept Introduction
Skipped applicationDirect to CTO2 day process
Introductions to Hiring Managers
When Jack finds a match in Jill’s network, he introduces you directly to the hiring manager. No applications. No waiting. Warm introductions to people who already want to meet you.
The numbers.
230K
Professionals working with Jack
15M
Jobs scanned every day
30hrs
Saved on average vs traditional job searching