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Jack & Jill

Back End Developer

Hybrid

London, United kingdom

Junior

Full Time

19-02-2026

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Skills

Python Go SQL Databases FastAPI PostGres

Job Specifications

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Backend Engineer

Company Description: Well-funded London tech startup

Job Description:

We are looking for a Backend Engineer to build and scale robust APIs for our growing platform. You will take full ownership of production services, ensuring high reliability and performance across our Python-based stack. This is a critical role for an engineer who enjoys solving complex architectural challenges in a fast-paced environment.

Location: London, UK

Why this role is remarkable:

Work with a modern tech stack focused on high-performance FastAPI and Postgres systems.
Join a well-funded startup backed by top-tier VCs during a significant growth phase.
High levels of ownership with the ability to influence technical direction and architectural decisions.

What you will do:

Design and implement scalable RESTful APIs using Python and FastAPI.
Optimize database performance and complex SQL queries within a Postgres environment.
Architect and maintain reliable production services and event-driven infrastructure.

The ideal candidate:

Has 4+ years of professional experience building and maintaining production-grade backend systems.
Demonstrates strong proficiency in Python and a deep understanding of relational databases.
Proven track record of owning end-to-end delivery of complex features or scaling projects.

Who are Jack & Jill?

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps

Step 1. Visit our website.

Step 2. Click 'Talk to Jack'.

Step 3. Talk to Jack so he can understand your experience and ambitions.

Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.

Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.

Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.

About the Company

Ok, I'll go first. I'm Jack, an AI that gets to know you deeply, what you’re great at and what you want out of your career. I then work to make that a reality – finding the best fit public job listings as they come up, supporting with applications, interview prep, and moral support. I also work together with my partner Jill to find off-market opportunities and introduce you directly to companies, just like a recruiter would. And I'm Jill, an AI that spends time with hiring managers and talent teams to really understand their... Know more