Jack & Jill

Job Title Software Engineer Company Description Rezonant - Agent-native SDLC startup Job Description Join a high-performance team building the future of software development as Rezonant exits private beta. You will design, conceptualize, and build an agent-native platform from the ground up, integrating AI into agile workflows. This role offers the chance to shape both technical architecture and product culture at the earliest stage of growth. Location London, UK Why this role is remarkable Shape a product exiting private beta that is fundamentally reimagining the software development lifecycle through agent-native intelligence. Thrive in a high-performance culture where bottom-up innovation is encouraged and rapid execution is used to solve complex, ambiguous problems. Work at the cutting edge of AI, using tools like Langgraph and Temporal to build systems that automate traditional engineering processes. What you will do Design and build the product from the ground up using a modern stack including Python, React, Next.js, and Temporal. Lead cross-disciplinary engineering efforts with full autonomy to validate, gather feedback, and iterate based on direct customer interactions. Architect elegant, simple solutions for complex technical challenges while maintaining high velocity using AI-native development practices. The ideal candidate Possesses at least 2+ years of professional software engineering experience with a degree in CS, Engineering, AI, or a related field. Demonstrates deep proficiency with LLM tools and agent frameworks such as Langsmith, RAG, and prompt engineering to accelerate development. Exhibits a strong product mindset with the ability to create beautiful user experiences and a philosophical belief in AI-accelerated SDLC.

Company Description: Deducta - Early-stage AI data intelligence startup Job Title: Senior Frontend Engineer Salary: £150k + Equity Location: London, UK Join a high-caliber team of Rhodes Scholars and ex-Spotify founders building an AI-native data intelligence platform. As a Senior Frontend Engineer, you will own the end-to-end user experience, shipping high-quality code at pace. You won't just execute tickets; you will help invent how global enterprises interact with mission-critical spend and supplier data. Why this role is remarkable High Impact & Ownership: Join as an early team member ( 9 people) where you help shape the technical culture, product trajectory, and frontend IP from the ground up. Elite Talent Density: Work alongside a world-class team including Rhodes Scholars and former founders from Spotify and GoCardless in a high-agency, low-process environment. AI-Native Innovation: Build at the leading edge of applied AI, creating sophisticated interfaces that make complex, agentic data cleansing and classification feel intuitive for enterprise users. What you will do Ship Features Fast: Design, develop, and deploy scalable frontend systems and UI components using React or Vue, maintaining a high bar for code quality and performance. Shape Product Experience: Collaborate directly with the design team to translate complex data problems into simple, delightful, and highly functional user interfaces. Drive Technical Excellence: Act as a technical sparring partner on product decisions, ensuring the frontend architecture is resilient, adaptable, and capable of handling complex data visualizations. The ideal candidate Proven Builder: You have extensive experience with modern frameworks (React/Vue) and a visible track record of building side projects, personal experiments, or high-quality products from scratch. Strong Product Instinct: You possess high agency and "good taste," meaning you care deeply about UX and don't require perfectly defined specs to drive work forward. Startup Mindset: You thrive in ambiguous, fast-paced environments and are motivated by the challenge of building a category-defining enterprise platform rather than just performing execution-oriented tasks.

Jack & Jill in London seeks a Senior Frontend Engineer to join an elite team focused on developing an AI-native data intelligence platform. You will design and deploy scalable frontend systems while collaborating closely with the design team to create high-quality user interfaces. The ideal candidate has experience with modern frameworks like React and Vue, demonstrating a strong product instinct and startup mindset. Equity options are available in addition to a competitive salary.

Job Title Senior Software Engineer Company Description - 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.

Job Title Systems Engineering Salary £70k-£130k + 0.1% to 1% Equity Company Description Architect - Seed-stage AI startup backed by Project A Job Description Architect is transforming the web from static pages into intelligent, real-time AI agents that adapt instantly to every visitor. As a Systems Engineer, you will own the deep backend infrastructure-from context engines and retrieval pipelines to scaling OLAP data layers-shaping how the internet's next generation of personalized experiences is built and delivered. Location London, UK Why this role is remarkable Join an elite team of 10 in a London HQ, working directly with founders and the CPTO to define a brand-new category of living, breathing web experiences. Benefit from strong financial backing with £3.5M raised from top-tier investors like Project A to disrupt a massive global market. Ownership is absolute here; you aren't just shipping features but architecting the core systems that enable autonomous AI agents to build websites on-the-fly. What you will do Design and implement high-performance retrieval systems and context engines to power real-time AI agent decision-making. Architect and scale service-oriented backend systems using TypeScript, Postgres, and Temporal.io to handle complex, long-running workflows. Build robust integration layers and OLAP scaling solutions that allow the platform to learn and optimize itself based on live visitor data. The ideal candidate Deep technical background in systems engineering, distributed systems, or data pipelines with professional mastery of TypeScript backend environments. Experience or a strong interest in AI infrastructure, specifically RAG, LLM evaluations, or workflow orchestration tools like Temporal and Cadence. A founding mentality that values craftsmanship-the "beautiful piece of wood on the back"-and thrives in a fast-paced, 5-day-per-week in-office collaborative culture.

Jack & Jill is looking for a talented Software Engineer to join their team. In this role, you will develop cutting-edge software for robotics in unpredictable environments. You'll work with technologies like Python and TypeScript, and collaborate closely with world-leading researchers in the AI field. This position offers the chance to make a significant impact in real robot deployments across various industries. Join us and help shape the future of robotics!

Job Title Software Engineer Company Stateful Robotics Ltd - VC-backed robotics AI startup Job Description Join an Oxford spin out building the intelligence layer for robots in unpredictable real world environments. As a foundational engineer, you will develop a mission control platform that provides robots with persistent memory and long horizon decision making. You will work across the full stack to turn cutting edge research into production ready software products. Location Oxford, UK Why this role is remarkable Work at the frontier of physical AI with world leading researchers, including founders who previously built and sold Latent Logic to Waymo. Join a well funded team that recently closed a $4.8M pre seed round led by Amadeus Capital Partners and Oxford Science Enterprises. Gain massive ownership and breadth, shipping software that runs on real robots deployed in infrastructure, construction, and logistics pilot sites. What you will do Build and iterate on backend APIs and customer facing UI features to enable complex interactions with core robotics technology. Design and deploy software across diverse environments, including cloud, on premise, and direct on robot installations. Collaborate with research teams to integrate algorithmic developments and ensure high quality through CI/CD and testing best practices. The ideal candidate Has 2+ years of professional experience with a strong grasp of Python, TypeScript, or C++ in complex or safety critical domains. Is a delivery focused engineer comfortable moving between backend, frontend, and DevOps in a fast paced startup environment. Demonstrates proficiency with AI assisted development tools like Claude or Copilot and has a passion for applying AI to real world systems.

Jack & Jill is seeking an AI Engineer to join a fast-growing Series A edtech startup in London. In this pivotal role, you will leverage cutting-edge AI technologies to create interactive learning experiences for over 1.5 million users. With a focus on production-grade LLM systems, you'll design and implement impactful AI features while working in a high-autonomy environment directly with the CEO. Ideal candidates have over 7 years of experience, deep proficiency in TypeScript, and a passion for AI innovation.

AI Engineer Salary: £170k + Equity Company Description: Gizmo.ai - Series A edtech startup backed by $22M in funding Job Description: Join one of the UK's fastest-growing startups to build the "Duolingo for anything." Reporting directly to the CEO, you will leverage generative AI and cognitive science to transform passive learning into interactive, gamified experiences. You'll play a central role in shipping production-ready LLM features to over 1.5 million monthly active users. Location: London, UK Why this role is remarkable: Massive traction with 1.5M monthly active users and $5M ARR, scaling rapidly following a $22M Series A funding round High-impact, early-stage opportunity where you report directly to the CEO and shape the product architecture for millions of global learners Work at the cutting edge of AI implementation, moving beyond research to deploy production-grade LLM systems using Gemini, GPT-5, and Claude What you will do: Design and ship production AI features using advanced prompt engineering and the latest models like Gemini and GPT-5 Build and maintain robust evaluation frameworks to systematically assess and improve the performance and grounding of AI systems Integrate complex AI models into a high-performance TypeScript production environment, owning features from initial design through to deployment The ideal candidate: Senior software engineer with 7+ years of experience and deep technical proficiency in TypeScript and backend systems Practical expertise in AI/LLM implementation, including production work with APIs, model evaluation, or a strong academic ML background Proven startup veteran or ex-founder who thrives in high-autonomy environments and prioritizes shipping impactful code over rigid corporate processes

Job Title: Lead Data Scientist Salary: £130k Company Description: Faculty - Applied AI specialist now part of Accenture Job Description: Lead technical strategy for high-stakes AI projects in the UK defence sector, collaborating with partners like MOD and Leonardo. You will architect production-grade solutions for UAV automation, LLMs, and edge AI while managing cross-functional teams. This role combines deep technical machine learning expertise with strategic client leadership to deliver real-world national security impact. Location: London, UK Why this role is remarkable: Work on mission-critical AI applications including UAV automation, satellite computer vision, and OSINT with LLMs that ship into real-world, high-stakes environments. Join a prestigious, PhD-heavy technical culture within a company that has transformed over 350 global customers and is now part of the Accenture network. Enjoy market-leading benefits including an unlimited annual leave policy, private healthcare, and dedicated professional coaching through Sanctus. What you will do: Set the technical direction and architect scalable, production-grade ML solutions for complex defence and national security challenges. Lead and mentor multi-disciplinary teams of data scientists and managers, driving technical excellence and best practices across the organization. Act as a trusted advisor to senior government and military stakeholders, aligning cutting-edge AI capabilities with long-term strategic commercial goals. The ideal candidate: Deep expertise in machine learning domains such as Computer Vision, NLP/LLMs, or Signal Processing with a track record of delivering production software. Proven technical leadership experience, including managing other managers and overseeing the end-to-end delivery of complex, high-risk technical roadmaps. Must be eligible for UK Security Clearance (SC) and willing to travel to client sites across the UK 2-4 days per week.

Jack & Jill is seeking a Lead Data Scientist in London to lead technical strategy for AI projects in the UK defence sector. You will manage cross-functional teams, architect production-grade solutions in UAV automation and LLMs, and act as a trusted advisor to government stakeholders. The ideal candidate has deep expertise in machine learning and proven leadership experience. The position offers outstanding benefits including unlimited leave, private healthcare, and professional coaching.