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

The next step is to speak to Jack.

Job Title

Mid-Senior Full-Stack Engineer

Salary

£80k-£90k + Equity

Company Description

VC-backed creator monetization and B2B payments infrastructure startup backed by Polygon and Harvard Innovation Labs

Job Description

You will own features end-to-end across a creator monetization platform and its new B2B payments infrastructure arm. Working in a high-output, 14-person team in Shoreditch, you will build subscription flows, global payout systems, and internal tools. This role requires a pragmatic engineer who leverages AI tools to ship high-quality code at speed.

Location

London, UK

Why this role is remarkable

• Ship at the intersection of content and fintech by building a platform that offers creators 5% fees compared to the 20% industry standard.
• Join a fast-growing team backed by top-tier investors including Polygon, Escape Velocity, and Harvard Innovation Labs during a high-leverage spin-out phase.
• Enjoy genuine ownership in a lean, high-output environment where your code directly impacts global creator payouts and multi-rail B2B payment processing.

What you will do

• Design and implement end-to-end features across the creator platform, including subscription modules, content delivery systems, and creator-facing dashboards.
• Build and scale robust B2B payments infrastructure (MintCash) handling multi-rail processing, global payouts, and smart routing integrations.
• Enhance platform reliability and observability while using AI force multipliers like Cursor or Copilot to accelerate the development lifecycle.

The ideal candidate

• Has 3–6 years of full-stack experience with React/Next.js, Node.js, TypeScript, and Prisma, ideally within a fast-moving startup environment.
• Demonstrates an AI-forward workflow, using modern LLM-based coding tools daily to increase productivity and maintain high code quality.
• Possesses a pragmatic, product-focused mindset with the ability to own complex features independently and a desire to solve hard fintech problems.

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 the job listing.
Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/mid-senior-full-stack-engineer-80k-90k-equity-at-vc-backed-creator-monetization--349a2957-ded1-4b1b-ab62-c348ff1cf000?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_349a2957-ded1-4b1b-ab62-c348ff1cf000
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.

#LI-JANDJLIVE

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

The next step is to speak to Jack.

Job Title

Senior Software Engineer

Salary

Not Disclosed

Company Description

Strategic partner of Lloyds Banking Group building the all-in-one digital platform for vehicle management

Job Description

You will own and elevate a platform used by millions of UK drivers, building scalable services for partners like Lloyds Banking Group, MoneySuperMarket, and Motorway. Working in a small team of serial founders who have successfully built and exited startups, you will architect distributed systems and define the future of automotive ownership.

Location

London, UK

Why this role is remarkable

• Join a high-caliber team of experienced operators and serial founders who have successfully built, exited, and scaled startups to profitability.
• Influence the infrastructure of a market leader with deep integrations into major UK financial institutions like Lloyds Banking Group and esure.
• Take full ownership of the platform architecture within a fast-paced environment where you shape the product vision rather than just maintaining legacy code.

What you will do

• Architect and operate a scalable backend platform using TypeScript and Node.js to power web apps, APIs, and internal operations tools.
• Design and implement event-driven macroservices and distributed systems leveraging AWS services like ECS, Lambda, and EventBridge.
• Collaborate cross-functionally with design and product teams to translate complex car management workflows into intuitive, high-performance customer experiences.

The ideal candidate

• Possesses deep production experience building robust, secure APIs and distributed systems using TypeScript and Node.js as their primary stack.
• Demonstrates mastery of AWS infrastructure, specifically event-driven architectures involving ECS, EventBridge, and MongoDB.
• Exhibits a scrappy, builder mindset with prior experience in a fast-paced startup where they successfully managed shifting priorities and high-impact delivery.

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 the job listing.
Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/senior-software-engineer-at-strategic-partner-of-lloyds-banking-group-building-t-67022e53-45d2-4c9f-b4db-ddbe05200f37?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67022e53-45d2-4c9f-b4db-ddbe05200f37
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.

#LI-JANDJLIVE

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

The next step is to speak to Jack.

Job Title

Systems Engineer

Salary

£150k–£195k + Equity

Company Description

$25M Series A cybersecurity startup backed by Next47, Ten Eleven Ventures, and In-Q-Tel

Job Description

You will join an elite team building the foundational endpoint agent for a category-defining AI security platform. Using Rust, you will develop high-performance, low-level software that protects sensitive data in real-time across Windows, macOS, and Linux. This role is critical in enabling enterprises to adopt AI tools safely at scale.

Location

London, UK

Why this role is remarkable

• Work at the bleeding edge of AI governance, building the security layer for a world where every enterprise employee uses an AI copilot.
• Join a high-traction startup led by experienced founders who previously scaled Digital Shadows, supported by top-tier investors like In-Q-Tel and Next47.
• Total ownership over core architecture with a highly technical team that values Rust, memory safety, and high-performance systems engineering.

What you will do

• Design and optimize security agent components in Rust, ensuring sub-500ms inference and zero-touch data protection on user devices.
• Conduct technical research to implement cross-platform signals and controls for data movement across Windows, macOS, and Linux subsystems.
• Build robust, CI-tested deployment mechanisms for client-facing releases that maintain high reliability and performance under real-world conditions.

The ideal candidate

• Deep production experience in Rust or C++ with a strong focus on systems programming concepts like memory safety, concurrency, and IPC.
• Proven track record building security-critical client software such as endpoint agents, EDR/XDR components, or low-level OS utilities.
• AI-forward mindset with the ability to leverage modern tools like Claude Code or Cursor to accelerate high-expertise systems development.

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 the job listing.
Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-25m-series-a-ai-security-startup-8f962488-89f6-4440-a699-5e6d6d350ca4?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_8f962488-89f6-4440-a699-5e6d6d350ca4
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.

#LI-JANDJLIVE

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

The next step is to speak to Jack.

Job Title

Staff Backend Engineer

Salary

£140k-160k+ + Equity

Company Description

a16z and YC-backed Series B marketplace reinventing wholesale sustainable fashion

Job Description

Join a high-growth marketplace moving millions of items across 70 countries. As a Staff Engineer in the Growth squad, you will architect business-critical systems for payments, checkout, and global order management. You'll solve complex logistics and technical challenges at scale, building the backend foundation for a global circular fashion economy.

Location

London, UK

Why this role is remarkable

• Rare opportunity to join an a16z-backed Series B scaleup operating at the intersection of AI-powered logistics and sustainable global commerce.
• High-impact technical ownership: architect systems handling 500K+ unique items monthly, utilizing AI-driven grading and inventory systems spanning three continents.
• Direct collaboration with an elite engineering culture led by a CTO from Google and Postmates, emphasizing architectural depth and product-focused engineering.

What you will do

• Lead the architectural direction for the Growth squad, owning the end-to-end ecommerce journey from discovery through to complex global checkout flows.
• Design and scale robust backend systems for payments, credit facilities, and seller tools capable of handling millions of unique inventory items.
• Act as a technical force multiplier, leveraging AI to optimize supply chain tooling and mentoring senior engineers in a high-performance environment.

The ideal candidate

• Extensive experience as a Staff or Lead Engineer at tier-1 consumer scaleups like Monzo, Deliveroo, Depop, or similar high-growth B2C environments.
• Proven track record of building and scaling complex backend systems including payments, checkout, or high-throughput data pipelines using Node.js/TypeScript.
• Product-obsessed mindset with the ability to articulate complex architectural trade-offs and connect deep engineering decisions to tangible business outcomes.

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 the job listing.
Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/staff-backend-engineer-140k-160k-equity-at-a16z-backed-series-b-marketplace-ea06e690-f7ee-4359-9bca-a366c7500f39?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_ea06e690-f7ee-4359-9bca-a366c7500f39
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.

#LI-JANDJLIVE

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

The next step is to speak to Jack.

Job Title

Founding Engineer

Salary

$150k - $250k + Equity

Company Description

$6M Seed AI infrastructure startup backed by General Catalyst and Paul Graham

Job Description

As a Founding Engineer at this YC S25 startup, you will build the critical identity and communication layer for the agentic era. You will design high-throughput backend systems and APIs that serve as the inbox for AI agents, enabling them to communicate and authenticate as independent digital citizens in a rapidly expanding market.

Location

San Francisco, USA

Why this role is remarkable

• Work at the frontier of AI infrastructure with $6M in funding from General Catalyst, Paul Graham, and the CTO of HubSpot.
• Join a high-performance team of 8 hailing from NVIDIA, Amazon, and Optiver, currently doubling their user count every two weeks.
• True founding impact with significant equity and the opportunity to define a new category of the internet where agents outnumber humans.

What you will do

• Design and implement intuitive APIs and abstractions that allow AI agents to operate as first-class citizens of the internet.
• Build and scale distributed systems and core infrastructure capable of processing over 100 million emails per day with low latency.
• Own projects end-to-end, from initial system design to production rollout, while collaborating directly with the founding team and customers.

The ideal candidate

• Strong backend and systems engineering background with experience shipping production-grade software at a high-growth tech company or startup.
• Deep understanding of distributed systems, cloud infrastructure, or developer tools, with a preference for messaging and protocol-heavy experience.
• High-velocity builder who thrives in ambiguity and obsesses over quality, detail, and solving complex problems from 0 to 1.

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 the job listing.
Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/founding-engineer-150k-250k-equity-at-6m-seed-ai-infrastructure-startup-67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973
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.

#LI-JANDJLIVE