At a Glance
- Tasks: Build AI-powered decision infrastructure and design end-to-end features.
- Company: Exciting post-seed startup with a high-profile founding team.
- Benefits: Competitive salary, dynamic work environment, and impactful projects.
- Other info: Join a fast-paced London office and enjoy a flexible 4-day work week.
- Why this job: Shape the future of decision-making with innovative technology and a talented team.
- Qualifications: Experience in web applications using React, Python, and cloud infrastructure.
The predicted salary is between 60000 - 80000 € per year.
£10M+ post‑seed decision infrastructure startup led by former 10 Downing Street and Mass Testing advisors.
You will build critical decision infrastructure that uses AI‑powered synthetic audiences to simulate human behavior. Working directly with hands‑on founders, you'll evolve a platform that replaces guesswork with evidence‑based modeling. This role requires an execution‑focused engineer who can navigate ambiguity and bridge the gap between complex AI orchestration and intuitive product design.
Location: London, UK
Why this role is remarkable:
- Work with a high‑pedigree founding team including the former Chief Advisor to the PM on Digital and Data and the former Director of Mass Testing.
- Join a post‑seed startup with over £10M in funding that is solving the massive problem of how organizations model human response to uncertainty.
- High‑impact opportunity where your architectural decisions on APIs and system boundaries will shape the platform’s trajectory for years to come.
What You Will Do:
- Design and ship end‑to‑end features using React, Next.js, and Python/FastAPI to help users explore uncertainty through synthetic populations.
- Orchestrate complex AI components into a reliable, explainable system that provides trustworthy outputs for high‑stakes decision making.
- Own the entire product lifecycle from vague problem definition to polished execution, balancing rapid momentum with long‑term system health.
The ideal candidate:
- Proven experience building robust web applications with a modern stack including React, Python, and cloud infrastructure (GCP preferred).
- A 'thinking engineer' mindset with the ability to thrive in an environment without perfectly specified tickets or rigid corporate ceremony.
- Strong technical judgment and a bias toward action, comfortable working 4 days a week in a high‑intensity London‑based office environment.
Product / Software Engineer at £10M+ post-seed decision infrastructure startup employer: Jack & Jill
Join a dynamic and innovative post-seed startup in London, where you'll collaborate with a high-calibre founding team to build cutting-edge decision infrastructure. Our culture fosters creativity and agility, offering you the chance to make impactful architectural decisions while enjoying a flexible work environment that prioritises employee growth and development. With over £10M in funding, we provide a unique opportunity to shape the future of AI-driven solutions in a supportive and fast-paced setting.
StudySmarter Expert Advice🤫
We think this is how you could land Product / Software Engineer at £10M+ post-seed decision infrastructure startup
✨Tip Number 1
Network like a pro! Reach out to people in your industry on LinkedIn or at local meetups. We all know that sometimes it’s not just what you know, but who you know that can get you in the door.
✨Tip Number 2
Prepare for those interviews! Research the company and its founders, especially their work with AI and decision-making. We want you to show them you’re not just another candidate, but someone who truly gets their mission.
✨Tip Number 3
Show off your skills! If you’ve got a portfolio or GitHub with projects using React, Python, or anything relevant, make sure to highlight that. We love seeing what you can do beyond just words on a CV.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we’re always on the lookout for passionate engineers ready to tackle uncertainty with us.
We think you need these skills to ace Product / Software Engineer at £10M+ post-seed decision infrastructure startup
Some tips for your application 🫡
Show Your Passion for Problem-Solving:When writing your application, let us see your enthusiasm for tackling complex problems. Share examples of how you've navigated ambiguity in past projects and how you’ve used your skills to create effective solutions.
Highlight Relevant Experience:Make sure to showcase your experience with the tech stack mentioned in the job description, like React and Python. We want to know how you've built robust applications and what impact your work has had on previous projects.
Be Authentic and Personal:Don’t be afraid to let your personality shine through in your application. We appreciate authenticity, so share your journey and what drives you as an engineer. This helps us get a sense of who you are beyond just your technical skills.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity. Plus, it shows you’re proactive!
How to prepare for a job interview at Jack & Jill
✨Know Your Tech Stack
Make sure you’re well-versed in React, Python, and FastAPI. Brush up on your knowledge of cloud infrastructure, especially GCP, as this will be crucial for the role. Be ready to discuss specific projects where you've used these technologies.
✨Showcase Your Problem-Solving Skills
Prepare examples that highlight your ability to navigate ambiguity and tackle complex problems. Think about times when you had to make architectural decisions or design features without clear specifications, and be ready to share those experiences.
✨Understand the Company’s Mission
Familiarise yourself with the startup's focus on AI-powered decision infrastructure. Be prepared to discuss how your skills can contribute to their goal of replacing guesswork with evidence-based modelling. This shows genuine interest and alignment with their mission.
✨Demonstrate a Bias Toward Action
In a high-intensity environment, it’s important to show that you can take initiative. Prepare to talk about instances where you’ve taken decisive action in your previous roles, especially in fast-paced settings. This will resonate well with the founders’ expectations.
