Jack helps you find life-changing roles at companies like 
BUILD, Inc.
Jack scans 15 million jobs daily and introduces you directly to hiring managers.
Join professionals today
Build Technologies' mission is to accelerate and amplify the world's most important built projects by creating a collaboration between human experts and agentic AI. They envision a future where buildings are autonomously driven from concept to completion, free from delays, cost, and complexity, allowing people to deliver more deals, make decisions, build relationships, and create. The company is partnering with major built world institutions to automate mission-critical services and push the boundaries of what's possible in construction and development.
- Industry
- AI for the Built World
- Team size
- 1-50
- Headquarters
- New York, San Francisco and London
- Founders
- James Stirrat-Ellis and Ben McClusky
- Investors
- Tier 1 investors, founders of Meta AI Research, OpenAI
Open roles at BUILD, Inc.
Talk to Jack and he’ll help you get considered for the roles below, or anything else that fits what you’re looking for.
AI Engineer (Generalist)
Join an elite team backed by Index Ventures and leaders from OpenAI to build the agentic AI stack for the built world. This San Francisco based startup is already at 7 figure revenue, automating trillion dollar real estate workflows that used to take weeks down to hours. As a generalist AI Engineer, you will own the end to end development of production grade agents using LangGraph and Python. If you want radical autonomy, 0.3 1% equity, and the chance to solve hard, unsolved problems at the intersection of AI and physical infrastructure, this is your chance to do your life's work.
Head of Engineering
Are you ready to own the technical evolution of the $300T built world? This Index Ventures backed startup, supported by leaders from OpenAI and Blackstone, is hiring a Head of Engineering to lead their agentic AI platform. You will build and lead an elite engineering team in SF or NYC, architecting systems that deliver results 90% faster than humans for the world's largest asset managers. If you have scaled vertical AI systems and crave radical autonomy, this is your next career defining role.
How Jack & Jill work together
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.
JackTell me about a technical migration you led under time pressure.
I led a six-week migration of 40 services in three phases. We aligned stakeholders early and shipped two days ahead with zero downtime.
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
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.
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.
JackEmployer
“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
Salary 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.
Accept Introduction
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.
Professionals working with Jack
Jobs scanned every day
Saved on average vs traditional job searching