<?xml version="1.0" encoding="UTF-8"?>
<source>
  <publisher>Jack &amp; Jill</publisher>
  <publisherurl>https://jackandjill.ai</publisherurl>
  <job>
    <title>Mid / Mid-Senior Full-Stack Engineer (£80k-£90k + Equity) at Mintstars</title>
    <date>2026-04-27T16:16:53.184Z</date>
    <referencenumber>349a2957-ded1-4b1b-ab62-c348ff1cf000</referencenumber>
    <url>https://jackandjill.ai/jobs/mid-mid-senior-full-stack-engineer-80k-90k-equity-at-mintstars-349a2957-ded1-4b1b-ab62-c348ff1cf000</url>
    <applyurl>https://jackandjill.ai/jobs/mid-mid-senior-full-stack-engineer-80k-90k-equity-at-mintstars-349a2957-ded1-4b1b-ab62-c348ff1cf000/apply</applyurl>
    <company>Mintstars</company>
    <city>London</city>
    <location>London, United Kingdom</location>
    <country>United Kingdom</country>
    <description><![CDATA[**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](https://jackandjill.ai/jobs/mid-mid-senior-full-stack-engineer-80k-90k-equity-at-mintstars-com-349a2957-ded1-4b1b-ab62-c348ff1cf000?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_349a2957-ded1-4b1b-ab62-c348ff1cf000).


**Title:** Mid / Mid-Senior Full-Stack Engineer (£80k-£90k + Equity) at Mintstars.com

**Job Title:**
Mid / Mid-Senior Full-Stack Engineer

**Salary:**
£80k-£90k + Equity

**Company Description:**
Mintstars.com - VC-backed creator monetization and payments platform

**Job Description:**
Join a high-output team building the infrastructure for the next generation of the creator economy. You will own end-to-end features for both MintStars’ creator platform and MintCash, their B2B payments arm. This role focuses on shipping clean, pragmatic code across a modern TypeScript stack to solve complex payment and content delivery challenges.

**Location:**
London, UK

**Why this role is remarkable:**
- Work on a platform with a disruptive 5% fee model, directly impacting creator livelihoods while spinning out a sophisticated B2B payments infrastructure arm.
- Join a lean, high-output team backed by top investors including Polygon, Escape Velocity, and Harvard Innovation Labs, offering high visibility and ownership.
- Influence the technical direction of a product solving genuinely hard problems at the intersection of global payouts, smart routing, and content monetization.

**What you will do:**
- Architect and ship end-to-end features including subscription flows, payout systems, and creator tooling using React, Node.js, and tRPC.
- Build and maintain critical payment integrations with providers like Corefy and CCBill to support multi-rail processing and global payouts.
- Enhance platform reliability and performance through improved observability, internal admin dashboards, and pragmatic, system-level thinking.

**The ideal candidate:**
- Possesses 3-6 years of full-stack experience, ideally within a fast-moving startup environment, and is comfortable owning features without hand-holding.
- Is an AI-forward engineer who treats tools like Cursor or Copilot as a genuine force multiplier to accelerate development and quality.
- Demonstrates strong product instincts and a pragmatic approach to coding, with a preference for clean, maintainable solutions over complex over-engineering.

**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](https://jackandjill.ai/jobs/mid-mid-senior-full-stack-engineer-80k-90k-equity-at-mintstars-com-349a2957-ded1-4b1b-ab62-c348ff1cf000?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_349a2957-ded1-4b1b-ab62-c348ff1cf000)**.
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.

#LI-JANDJLIVE]]></description>
    <salary>£80k-£90k + Equity</salary>
    <jobtype>FULL_TIME</jobtype>
    <expirationdate>2026-07-26T20:17:31.226Z</expirationdate>
  </job>
  <job>
    <title>Senior Software Engineer at Caura - UK car management platform</title>
    <date>2026-04-27T16:16:53.184Z</date>
    <referencenumber>67022e53-45d2-4c9f-b4db-ddbe05200f37</referencenumber>
    <url>https://jackandjill.ai/jobs/senior-software-engineer-at-caura-uk-car-management-platform-67022e53-45d2-4c9f-b4db-ddbe05200f37</url>
    <applyurl>https://jackandjill.ai/jobs/senior-software-engineer-at-caura-uk-car-management-platform-67022e53-45d2-4c9f-b4db-ddbe05200f37/apply</applyurl>
    <company>Caura</company>
    <city>London</city>
    <location>London, United Kingdom</location>
    <country>United Kingdom</country>
    <description><![CDATA[**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](https://jackandjill.ai/jobs/senior-software-engineer-at-caura-com-67022e53-45d2-4c9f-b4db-ddbe05200f37?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67022e53-45d2-4c9f-b4db-ddbe05200f37).


**Title:** Senior Software Engineer at Caura.com - UK car management platform

**Job Title:**
Senior Software Engineer

**Salary:**
Not Disclosed

**Company Description:**
Caura.com - High-growth vehicle management platform

**Job Description:**
As a Senior Software Engineer at Caura, you will own the evolution of an all-in-one car management platform used by millions. You'll architect distributed systems and build scalable services for major partners like Lloyds Banking Group and MoneySuperMarket. Join a high-agency team of experienced founders to simplify vehicle ownership through technical excellence.

**Location:**
London, UK

**Why this role is remarkable:**
- Lead high-impact engineering for a platform partnering with industry giants like Lloyds Banking Group, esure, and Motorway to redefine UK driving admin.
- Join an elite team of serial entrepreneurs and operators who have successfully built and exited startups, offering a masterclass in scaling to profitability.
- Take full ownership of a modern stack including Svelte, Node.js, and AWS event-driven architecture with the autonomy to shape the product roadmap.

**What you will do:**
- Architect and operate scalable distributed macroservices using TypeScript and Node.js within an event-driven AWS environment (ECS, Lambda, EventBridge).
- Collaborate directly with design and product teams to translate future visions into stable, secure internal tools and consumer-facing features.
- Drive engineering excellence by defining platform architecture, spotting production issues early, and experimenting with AI tools to accelerate development workflows.

**The ideal candidate:**
- Extensive production experience building robust APIs and microservices using TypeScript and Node.js as a primary backend focus.
- Deep technical knowledge of AWS cloud infrastructure, specifically ECS, EventBridge, and Lambda, alongside NoSQL databases like MongoDB.
- A "scrappy builder" mindset with previous experience in fast-paced startups, comfortable navigating ambiguity and taking end-to-end ownership of complex features.

**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](https://jackandjill.ai/jobs/senior-software-engineer-at-caura-com-67022e53-45d2-4c9f-b4db-ddbe05200f37?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67022e53-45d2-4c9f-b4db-ddbe05200f37)**.
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.

#LI-JANDJLIVE]]></description>
    <salary>Not Disclosed</salary>
    <jobtype>FULL_TIME</jobtype>
    <expirationdate>2026-07-26T20:17:31.227Z</expirationdate>
  </job>
  <job>
    <title>Systems Engineer (£150k–£195k + Equity) at Harmonic Security Inc.</title>
    <date>2026-04-27T16:16:53.184Z</date>
    <referencenumber>8f962488-89f6-4440-a699-5e6d6d350ca4</referencenumber>
    <url>https://jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-harmonic-security-inc-8f962488-89f6-4440-a699-5e6d6d350ca4</url>
    <applyurl>https://jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-harmonic-security-inc-8f962488-89f6-4440-a699-5e6d6d350ca4/apply</applyurl>
    <company>Harmonic Security Inc.</company>
    <city>London</city>
    <location>London, United Kingdom / Remote</location>
    <country>United Kingdom</country>
    <description><![CDATA[**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](https://jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-harmonic-security-inc-8f962488-89f6-4440-a699-5e6d6d350ca4?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_8f962488-89f6-4440-a699-5e6d6d350ca4).


**Title:** Systems Engineer (£150k–£195k + Equity) at Harmonic Security Inc.

**Job Title:**
Systems Engineer

**Salary:**
£150k–£195k + Equity

**Company Description:**
Harmonic Security Inc. - Series A cybersecurity startup defining AI data protection.

**Job Description:**
Join a category-defining startup building the future of AI security. As a Systems Engineer, you will own the development of low-level, security-critical endpoint agents across Windows, macOS, and Linux. Working primarily in Rust, you'll design resilient client software that enables enterprises to adopt AI tools safely while protecting sensitive data in real-time.

**Location:**
London, UK or Remote (UK)

**Why this role is remarkable:**
- Shape a new category of cybersecurity at a Series A startup backed by $25M from elite investors like Next47, Ten Eleven Ventures, and In-Q-Tel.
- Work at the OS level on high-impact software that runs on millions of devices, requiring extreme performance, reliability, and sub-500ms inference speeds.
- Join an AI-first engineering culture led by seasoned founders who previously scaled Digital Shadows, offering significant equity and high technical ownership.

**What you will do:**
- Design and optimize cross-platform security agent components in Rust to enforce data policy and collect system signals on-device.
- Conduct deep technical research into OS subsystems to implement cutting-edge product features and solve platform-specific challenges with precision.
- Build robust CI/CD pipelines and validation tooling to ensure stable, reproducible native application releases for global enterprise customers.

**The ideal candidate:**
- Extensive professional experience in Rust or C++ systems programming, focusing on memory safety, concurrency, IPC, and platform-specific APIs.
- Proven track record of shipping production-grade security software such as EDR, XDR, or DLP agents across Windows, Linux, and macOS platforms.
- Disciplined engineering mindset with a passion for automated testing, observability, and using AI tools to accelerate the software development lifecycle.

**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](https://jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-harmonic-security-inc-8f962488-89f6-4440-a699-5e6d6d350ca4?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_8f962488-89f6-4440-a699-5e6d6d350ca4)**.
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.

#LI-JANDJLIVE]]></description>
    <salary>£150k–£195k + Equity</salary>
    <jobtype>FULL_TIME</jobtype>
    <expirationdate>2026-07-26T20:17:31.227Z</expirationdate>
  </job>
  <job>
    <title>Staff Backend Engineer (£140k-£160k+ + Equity) at Fleek - VC-backed B2C Marketplace</title>
    <date>2026-04-27T16:16:53.184Z</date>
    <referencenumber>ea06e690-f7ee-4359-9bca-a366c7500f39</referencenumber>
    <url>https://jackandjill.ai/jobs/staff-backend-engineer-140k-160k-equity-at-fleek-vc-backed-b2c-marketplace-ea06e690-f7ee-4359-9bca-a366c7500f39</url>
    <applyurl>https://jackandjill.ai/jobs/staff-backend-engineer-140k-160k-equity-at-fleek-vc-backed-b2c-marketplace-ea06e690-f7ee-4359-9bca-a366c7500f39/apply</applyurl>
    <company>Fleek</company>
    <city>London</city>
    <location>London, United Kingdom</location>
    <country>United Kingdom</country>
    <description><![CDATA[**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](https://jackandjill.ai/jobs/staff-backend-engineer-140k-160k-equity-at-fleek-ea06e690-f7ee-4359-9bca-a366c7500f39?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_ea06e690-f7ee-4359-9bca-a366c7500f39).


**Title:** Staff Backend Engineer (£140k-£160k+ + Equity) at Fleek - VC-backed B2C Marketplace

**Job Title:**
Staff Backend Engineer

**Salary:**
£140k-£160k+ + Equity

**Company Description:**
Fleek - VC-backed marketplace platform transforming the global B2C supply chain.

**Job Description:**
As a Staff Backend Engineer at Fleek, you will lead the technical architecture for the Growth squad, overseeing critical ecommerce systems including payments, checkout, and complex order management. Reporting directly to the CTO, you'll build high-traffic product systems that scale from 500K to millions of unique, AI-graded inventory items across three continents.

**Location:**
London, UK

**Why this role is remarkable:**
- Join a high-velocity engineering culture led by CTO Sanket Agarwal (ex-Google, Postmates) in the heart of Shoreditch.
- Tackle massive technical complexity where every single inventory item is unique and graded by proprietary AI-sorting technology.
- Influence the direction of a scaling startup with genuine architectural ownership and a mission-driven approach to global fashion supply chains.

**What you will do:**
- Design and architect robust backend systems for payments, credit, and seller tools to support rapid consumer growth.
- Partner with the Growth squad to connect deep engineering decisions directly to buyer and seller business outcomes.
- Mentor senior engineers while serving as a force multiplier by integrating AI tools into the development workflow.

**The ideal candidate:**
- Proven track record at tier-1 consumer engineering cultures such as Monzo, Deliveroo, Skyscanner, or Wise.
- Extensive experience building and scaling deep backend systems like checkout, data pipelines, or order management at high traffic.
- Product-obsessed mindset with the ability to articulate complex technical trade-offs to both engineering and business stakeholders.

**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](https://jackandjill.ai/jobs/staff-backend-engineer-140k-160k-equity-at-fleek-ea06e690-f7ee-4359-9bca-a366c7500f39?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_ea06e690-f7ee-4359-9bca-a366c7500f39)**.
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.

#LI-JANDJLIVE]]></description>
    <salary>£140k-£160k+ + Equity</salary>
    <jobtype>FULL_TIME</jobtype>
    <expirationdate>2026-07-26T20:17:31.227Z</expirationdate>
  </job>
  <job>
    <title>Founding Engineer ($150k - $250k + Equity) at AgentMail - Identity and communication for AI agents</title>
    <date>2026-04-27T16:16:53.184Z</date>
    <referencenumber>67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973</referencenumber>
    <url>https://jackandjill.ai/jobs/founding-engineer-150k-250k-equity-at-agentmail-identity-and-communication-for-a-67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973</url>
    <applyurl>https://jackandjill.ai/jobs/founding-engineer-150k-250k-equity-at-agentmail-identity-and-communication-for-a-67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973/apply</applyurl>
    <company>Generalcatalyst</company>
    <city>San Francisco</city>
    <location>San Francisco, United States</location>
    <country>United States</country>
    <description><![CDATA[**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](https://jackandjill.ai/jobs/founding-engineer-150k-250k-equity-at-agentmail-67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973).


**Title:** Founding Engineer ($150k - $250k + Equity) at AgentMail - Identity and communication for AI agents

**Job Title:**
Founding Engineer

**Salary:**
$150k - $250k + Equity

**Company Description:**
AgentMail - High-growth infrastructure startup building the sole identity and communication layer for the AI agent era.

**Job Description:**
As a Founding Engineer, you will build the primitives that allow AI agents to communicate, authenticate, and operate in the real world. You will design intuitive APIs and high-performance distributed systems, owning projects from 0 to 1 while processing hundreds of thousands of emails daily for a rapidly expanding user base.

**Location:**
San Francisco, USA

**Why this role is remarkable:**
- **Unique Market Positioning:** AgentMail is building the "Gmail for Agents," serving as the essential identity provider in a category set to outnumber human users.
- **Elite Pedigree:** Join a high-caliber founding team with deep expertise from top-tier firms including Optiver, NVIDIA, Amazon, and Modern Treasury.
- **Extreme Growth:** The company has doubled its user count every two weeks since January, offering rare early-stage momentum and massive equity upside.

**What you will do:**
- Design and implement core backend infrastructure and APIs specifically optimized for AI agents as the primary end-users.
- Architect and scale low-latency distributed systems capable of processing high-volume communication and authentication requests.
- Lead end-to-end product initiatives from initial system design through to production rollout and customer feedback cycles.

**The ideal candidate:**
- **Technical Mastery:** Proven experience shipping production-grade software and managing complex cloud infrastructure or distributed systems at a high-growth startup.
- **Product Ownership:** A 0-to-1 builder who obsesses over quality and is comfortable making critical decisions across the entire stack.
- **Strategic Communicator:** A clear thinker capable of articulating technical trade-offs and navigating the uncharted territory of agent-to-agent communication.


**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](https://jackandjill.ai/jobs/founding-engineer-150k-250k-equity-at-agentmail-67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_67c02ff6-7a12-4ad4-8b3e-d3cc10b9a973)**.
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.

#LI-JANDJLIVE]]></description>
    <salary>$150k - $250k + Equity</salary>
    <jobtype>FULL_TIME</jobtype>
    <expirationdate>2026-07-26T20:17:31.227Z</expirationdate>
  </job>
</source>