Senior Product Engineer (AI)

Elliptic

Do you want to build the AI systems that compliance teams rely on to investigate real financial crime? Are you excited about taking agentic workflows from prototype to production at scale? Do you want your work to directly help catch bad actors moving money across blockchains? Elliptic is hiring a Senior AI Engineer to join our AI team. It is the team behind Elliptic's copilot, the AI product that helps compliance investigators trace fund flows, surface patterns, and respond to risk in real time. This role sits at the centre of that work, designing the agentic systems, LLM integrations, and backend services that turn complex blockchain data into useful answers. You'll join a focused team that cares about the quality of what it builds and gives you the space to do your best work. There's real ownership here, breadth across AI and backend systems, and the freedom to turn good ideas into shipped products. The problems are technically challenging, and the work is visible. The impact you will have: As a Senior AI Engineer on the AI team, you'll own significant parts of the Agentic stack that power Elliptic's copilot. You'll lead the design of agentic workflows, drive technical decisions on how we build and operate LLM-based features, and help raise the engineering standard across the team. You'll partner with product, web engineers, and your engineering lead to take complex problems from ambiguity to shipped product, and you'll mentor more junior engineers as the team grows. What you will do: * Design and build agentic workflows and AI-powered features that power Elliptic's copilot, using LLM frameworks such as LangChain or LangGraph. * Lead the design of agents, tool integrations, and retrieval pipelines that turn complex blockchain data into useful answers for investigators. * Build and own evaluation frameworks that measure and improve the quality, reliability, and latency of LLM outputs. * Design and build the backend services, APIs, and event-driven systems that support these features, using TypeScript and Node.js. * Drive technical design reviews and architecture decisions for AI workstreams. * Mentor and coach more junior engineers through pair programming, code review, and design feedback. * Raise the engineering bar across the team by promoting good practices in testing, observability, and AI system reliability. * Influence cross-team decisions on how AI capabilities integrate with the rest of the Elliptic platform. What you will achieve in the first 6 months: * Owned and shipped at least one significant AI capability end-to-end, from ambiguous problem statement through to production. * Driven the technical direction of an AI workstream, including architecture, evaluation, and rollout. * Established or improved at least one team practice for building AI systems (evals, observability patterns, prompt management, rollout safety). * Mentored junior engineers on AI engineering practices and contributed to their growth. * Built strong working relationships across product, web engineering, data engineering, and DevOps. * Started to influence adjacent teams on how Elliptic builds with AI. You will be a great fit here if you: * Care about building AI systems that work reliably in production, not just demos. * Have strong instincts for trade-offs specific to LLM systems: cost vs latency vs quality, deterministic vs probabilistic behaviour, when to use an agent vs a workflow. * Can take ambiguous AI problems and break them into shippable pieces with clear evaluation criteria. * Communicate clearly with non-engineers (product, stakeholders, leadership) about AI capabilities and limitations. * Have coached or mentored other engineers and enjoy raising the bar through reviews, pairing, and feedback. * Are genuinely curious about the domain and find blockchain investigations and financial crime prevention interesting. Our ideal candidate has: * 5-8+ years of software engineering experience, with at least 1-2 years of meaningful production work building LLM-powered features. * Direct experience with LLM frameworks such as LangChain, LangGraph, or similar. * Hands-on experience building agentic systems: tool use, multi-step reasoning, planning, memory, and human-in-the-loop patterns. * Practical understanding of prompt engineering, structured outputs, context management, and managing the trade-offs of working with LLMs. * Experience building and running evaluations for LLM outputs (eval sets, LLM-as-judge, regression testing). * Strong backend skills in TypeScript / Node.js, with solid API design. * Cloud experience (AWS: Lambda, ECS, S3, or similar). * Database proficiency across SQL (Postgres) and some NoSQL exposure. * Demonstrated ability to mentor and coach other engineers. * Uses AI coding assistants (Copilot, Cursor, Claude, etc.) critically and effectively as part of their day-to-day workflow. Bonus points for: * Experience with retrieval-augmented generation (RAG) and vector databases (pgvector, Pinecone, or similar). * Experience designing multi-agent systems and agent orchestration patterns. * Familiarity with LLM observability tools (LangSmith, Langfuse, Arize, or similar). * Experience working with multiple model providers (Anthropic, OpenAI, open-weight models) or with fine-tuning. * Hands-on experience with Terraform, Kubernetes, or infrastructure-as-code tooling. * Experience with observability platforms like Datadog. * Distributed or event-driven architectures (SNS, SQS). * Interest in cryptocurrency, blockchain, or compliance. JOB BENEFITS > How we work: * Hybrid working and the option to work from almost anywhere for up to 90 days per year * £500 Remote working budget to set up your home office space > Learning & Development: * $1,000 Learning & Development budget to use on anything (agreed with your manager) that contributes to your growth and development > Vacation/ Leave: * Holidays: 25 days of annual leave + bank holidays * An extra day for your birthday * Enhanced parental leave: we provide eligible employees, regardless of gender or whether they become a parent by birth or adoption, 16 weeks fully-paid leave and leave. > Benefits: * Private Health Insurance - we use Vitality! * Full access to Spill Mental Health Support * Life Assurance: we hope you will never need this - but our cover is for 4 times your salary to your beneficiaries * Cycle to Work Scheme We know Diversity and Inclusion is much deeper than just hiring, but it's important for us to mention it here. We welcome and embrace individuals of all backgrounds and identities at Elliptic, and this is an ongoing priority for us. We know incredible people don't all think in the same way. We want to be challenged every day. We believe our diverse team of individuals underpins this by bringing creative thinking and innovation to Elliptic every day. We are committed to creating a diverse, inclusive and equitable workplace, so we welcome applications from everyone, even if you may not think you fit all of the requirements of our roles. We foster an environment of psychological safety, where everyone feels comfortable to bring their whole self to work.

Attio

Attio is the CRM built for the AI era. Designed for the most ambitious go-to-market teams, it gives companies the power to understand every customer, automate at scale, and build their go-to-market motion exactly as they need. We've raised $116M from some of the world's best investors: GV (Google Ventures), Redpoint, Balderton, Point Nine, and 01A. We hire builders who thrive on complex technical challenges, hold themselves to a high bar, and genuinely care about delighting the people who use what they build. The team here brings sharp judgement, real craft, and the drive to do exceptional work. We're obsessed about the details and energized by the frontier. If you want to do the best work of your career, this is the right place. ABOUT THE ROLE Our Engineering team tackles the toughest challenges, so our users never have to. Real-time infrastructure, AI-native architecture, and a frontend that feels effortless - all powered by a team that moves fast, thinks rigorously, and holds an exceptionally high bar for quality. We’re looking for a Senior Product Engineer who takes pride in pushing boundaries, obsesses over details, and wants to help reinvent how millions of people work. WHAT YOU'LL DO * Use your strong expertise in TypeScript/Node.js/GCP to move the company and product forward * Lead projects end-to-end to solve real customer problems * Architect the systems which power new features to support our high standards of performance, reliability, security and scale, and re-architect existing systems as their scaling demands grow * Design REST API contracts for both internal and external consumers that are easy to work with * Represent Attio’s Product & Engineering values both internally and externally WHAT YOU'LL BRING * Experience designing scalable, reliable, secure backend systems * Excellent knowledge of modern Cloud Native systems architecture * Expertise with Node.js and TypeScript * A track record of ownership and product delivery * A proactive, self-motivated problem solving attitude, with a strong passion for advancing and innovating in distributed systems * The ability to communicate technical ideas to the wider team and influence stakeholders across Engineering, Product and Design Nice to have: * Experience contributing to, or participating in open source projects * An interest or experience in mentoring other members of the team * Experience working with data-rich backend applications, or processing large volumes of real-time data * A love for experimenting with new ideas, tools and techniques, and exploring new technologies WHAT WE OFFER * Competitive salary of £95,000 to £125,000 * Equity in an early-stage tech company on an incredible trajectory * 25 days holiday plus local public holidays * Apple hardware * Private medical insurance through AXA * Pension contribution through Hargreaves Lansdown * Enhanced family leave * Team off-site in fun places! (We've been to Barcelona, Lisbon, Malta, and Split so far)

Ankar

OVERVIEW The way companies innovate is broken. The systems built to create and protect ideas can’t keep up with the pace of change. Today, 90% of S&P 500 company value is intangible (e.g., in intellectual property) - yet R&D and IP teams spend half their time buried in manual work, sifting through patents and paperwork instead of pushing the frontier forward. The tools of creating and protecting are stuck in the past. We’re here to fix that. Ankar is building the R&D tools for the AI era and defining what applied research will look like in the next 20 years. We’re building infrastructure and product experiences our customers rely on every day. You’ll translate messy, ambiguous problems into clean, dependable software—and you’ll do it at the cutting-edge of AI. We’re at an inflection point: * We’ve raised >$24M to date from Tier-1 VCs like Atomico, Index Ventures, Norrsken, Daphni, and angels like the Founder of Hugging Face, CEO from Datadog, and Leaders from DeepMind and OpenAI. * We’re already working with the world’s most innovative companies including Fortune 500 company L’Oréal and global law firm Vorys * Expanding our world-class team with alumni from Palantir, Amazon, and BCG to tackle the $1T+ innovation market. We’re just getting started.   What you’ll do: * Build world-class product. Design, build, and maintain scalable, reliable systems and user-facing product experiences that customers depend on. * Ship fast and iterate constantly. Deliver quickly, learn from real feedback, and refine the product week by week with direct access to customers. * Own end-to-end execution. Take full ownership of projects across frontend, backend, and deployment—from design to implementation to monitoring and maintenance. * Partner deeply with teammates and customers. Collaborate closely with product, design, and customer-facing teams and customers themselves to ensure what we build is useful, usable, and impactful.   Culture at Ankar: Culture at Ankar is how we think, build, and operate. We’re building a generational company that redefines how the world’s best R&D teams create and protect ideas. * Contrarian - we think from first principles: We think deeply, question assumptions, and build from first principles. The best ideas come from clarity and rigour. * Creative - we build with taste: We’re building the R&D tools for the AI era and shaping what applied research looks like over the next 20 years. We care about precision, quality, and systems that last. * Competitive - we play to win: We move with urgency and set a very high bar for ourselves and each other. Every win raises the bar. Every challenge sharpens us. This role is not for you if... * You need a highly structured environment, a predefined playbook, regular working hours, or a schedule that never requires travel. We operate with high autonomy and ownership, expect our team to go above and beyond, be obsessed with our mission and thrive in ambiguity rather than wait for direction. * You prefer long planning cycles and certainty before acting. We move quickly, ship often, and adapt based on customer feedback and new information. * You want to manage the work rather than do the work. We're builders first, and everyone is expected to contribute directly to creating exceptional products. * You take it personally when ideas are challenged, priorities shift, or work gets redirected. We care more about finding the right answer than defending a particular one.   What we put behind our people Building at the frontier takes exceptional people. We invest accordingly. * Health Insurance : Full private health & dental coverage for you and your dependents. * Pension: Flexible pension scheme with up to 5% employer matching on qualifying earnings. * Food on us: Team lunches twice a week, plus dinner when working late in the office. * Cycle to work: Green Commute initiative scheme (up to £3k) to help you get a new bike tax-free. * Way we work: We combine deep, in-person collaboration (minimum 3 days/week in our Shoreditch office) with flexibility and trust. What matters is ownership, impact, and results, not where you work from. * Visa sponsorship: Yes   Compensation We believe exceptional people should be compensated accordingly. £160,000–£300,000 including equity (depending on experience)