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Senior Staff Machine Learning Engineer – Recommendation Systems

Location: New York (Hybrid – 4 days onsite)

Compensation: Total package between $600,000 – $800,000

(Base salary: $315,000-$370,000 + Equity + Exceptional Benefits)

THE COMPANY

This hyper-growth, global e-commerce leader is transforming how businesses deliver personalized and relevant experiences at the point of purchase. With a strong focus on cutting-edge AI/ML technologies, this organization is scaling rapidly and looking to expand their world-class engineering team.

THE ROLE

As a Principal Machine Learning Engineer, you’ll play a critical role in shaping the next generation of intelligent decision-making systems. You’ll partner with product and engineering teams to build and productionize ML solutions that drive relevance and performance in real-time, at scale. Key focus areas include smart bidding, lookalike modeling, budget pacing, and personalized recommendations.

Key Responsibilities:

• Collaborate with cross-functional teams to define, architect, and deploy ML solutions to complex business problems.
• Design and build production-ready ML models, data processing pipelines, and robust deployment systems.
• Contribute to scalable codebases, with a strong emphasis on testing (unit, integration, performance).
• Explore and prototype state-of-the-art models, conducting both offline and online experiments.
• Share knowledge through tech talks, internal workshops, and mentorship.

YOUR SKILLS & EXPERIENCE

• PhD or Master’s in Machine Learning or a related field
• 10+ years of industry experience building end-to-end production ML systems
• Strong background in AWS, TensorFlow, Feature Store technologies, and orchestration tools (e.g., Kubeflow)
• Expertise in at least two of the following: Bayesian methods, recommender systems, multi-task learning, meta-learning, CTR or CVR modeling
• Bonus: Familiarity with architectures such as DCNv2, MMOE, Deep & Wide, or ESMM

BENEFITS

• Equity in a high-growth business
• Premium, fully covered health insurance for you and your family
• 401(k) with 4% dollar-for-dollar match
• Catered lunch and snacks daily
• Global travel opportunities
• Collaborative, inclusive culture with a strong focus on diversity and innovation

HOW TO APPLY

If you’re a senior-level ML engineer looking to make a real-world impact in a high-scale, high-growth environment, apply now to speak with one of our specialist recruiters.

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Staff Frontend Engineer (Vue.JS)

Up to £115,000

Remote – London | High-Growth SaaS Scale-Up

Are you a frontend specialist ready to take the lead on complex, high-impact user experiences? I’m hiring for a Staff Frontend Engineer to join a cutting-edge B2B SaaS company that’s reimagining how professionals interact with data through rich visual tools. Think Figma meets enterprise productivity-and they’re scaling fast.

This is a senior IC role (no people management), focused on technical ownership, UI architecture, and delivering next-gen UX across an ambitious web platform. You’ll collaborate closely with the CTO and product leadership on features used daily by some of the world’s top financial, legal, and consulting firms.

Why Join?

• Up to £115,000 salary

• Fully remote-first with flexible UK location

• Backed by proven founders and already hitting top-quartile growth

• High-impact role building product used by thousands globally

• Work with modern tech: TypeScript, Vue.js (or React), component systems, design tools

What You’ll Be Doing

• Own and evolve the frontend architecture for a high-performing web app

• Lead development of interactive, data-rich UIs (think custom diagrams, dashboards, visualisation tools)

• Set best practices for component design, accessibility, performance, and DX

• Drive technical decision-making and collaborate with backend, product, and design teams

• Partner with the CTO and CEO on high-stakes initiatives and fast-moving product pivots

• Contribute clean, scalable, and well-tested code, and help mentor peers in craft and standards

• Keep pushing the envelope-explore emerging frontend tech, AI/UX integrations, and smarter tooling

What You’ll Bring

• Expert-level experience with modern JavaScript/TypeScript and a component-based framework (e.g., Vue, React, Angular)

• Proven track record of delivering frontend platforms that are complex, performant, and beautiful

• Deep understanding of frontend architecture, scalability, and maintainability in fast-changing environments

• Passion for clean code, design systems, and user-centric development

• Experience with frontend-focused DevOps and testing pipelines (CI/CD, GitHub Actions, etc.)

• Strong communicator who can translate complex technical ideas to stakeholders and collaborate across functions

• Bonus: experience in interactive diagramming, data visualisation, or canvas-based UI components.

Interested?
This is one of the best frontend IC roles out there right now if you want to influence product, own architecture, and build something that truly stands out. Apply now or reach out to learn more-even if you don’t tick every box.

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Principal Data Engineer

Up to £107,500 + Bonus + Benefits

London – Hybrid

Are you a hands-on data engineering leader who thrives on building robust platforms and driving technical excellence? I’m partnering with a well-loved consumer tech business that brings joy and storytelling into people’s lives-and they’re now scaling their data and ML platform to support the next phase of growth.

This is a chance to be at the forefront of a data transformation journey-owning architectural direction, mentoring engineers, and shaping a decentralised data model that will serve marketing, product, finance, and AI functions across the group.

Why Join?

• Up to £107,500 base salary

• Hybrid working with a London base (flexibility offered)

• High-impact role with a growing, values-driven data team

• Platform-focused, mission-led engineering

• Work with a modern cloud-native stack (Snowflake, DBT, Airflow, Terraform, AWS)

‍ What You’ll Be Doing

• Serve as the technical lead for cross-functional data initiatives

• Define and champion best practices for building scalable, governed, high-quality data pipelines

• Design and implement platform capabilities that support decentralised data adoption

• Drive forward technical strategy and architectural decisions for the team

• Mentor data and analytics engineers to raise the technical bar

• Balance near-term delivery with long-term platform health and innovation

• Collaborate across teams-product managers, analysts, ML engineers, and more

What You’ll Bring

• Extensive experience designing and building modern data platforms

• Strong skills in Python, SQL, and tools like DBT, Airflow, Fivetran

• Expertise in cloud services (ideally AWS) and IaC tools like Terraform

• Deep understanding of data architecture, ELT pipelines, and governance

• A background in software engineering principles (CI/CD, version control, testing)

• Excellent communicator-comfortable leading discussions with both technical and non-technical stakeholders

• A collaborative mindset and passion for coaching others

Tech Environment

• Cloud: AWS (Kinesis, Lambda, S3, ECS, etc.)

• Data Warehouse: Snowflake

• Transformation & Orchestration: Python, DBT, Airflow

• IaC & DevOps: Terraform, GitHub Actions, Jenkins

• Monitoring & Governance: Monte Carlo, Collate

Interested?
If you’re excited about platform-level ownership, technical influence, and building systems that help people tell their stories-get in touch. You don’t need to tick every single box to be considered.

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Head of Data Engineering

Up to £130,000 + 40% Bonus

Kent – Hybrid

Looking for your next big leadership move in data? I’m hiring for a Head of Data Engineering at a top-tier financial services group that’s serious about becoming a data-first organisation. This is a high-impact leadership role with full ownership of data engineering strategy, delivery, team building, and technical direction.

You’ll be leading the evolution of a world-class data function-building scalable ETL pipelines, shaping cloud-first architectures, and ensuring data quality and governance are at the core of everything the business delivers.

Why This Role Stands Out

• Salary up to £130,000 + 40% bonus

• Flexible/remote-first culture (UK-based)

• Strategic visibility-reporting directly to the Chief Data Officer

• Autonomy to build and shape a modern data engineering function from the ground up

• Strong backing from senior leadership for data transformation across the business

The Role

You’ll be responsible for leading and growing a high-performing team of Data Engineers and delivering a robust, scalable, and secure data infrastructure to meet current and future needs. This is a hands-off strategic leadership role, but you’ll need to be technically credible and comfortable engaging on architecture, cloud platforms, and modern data tooling.

Key Responsibilities

• Own and drive the data engineering roadmap

• Build and lead a multidisciplinary team delivering complex ETL and cloud data solutions

• Ensure alignment with data governance, security, and architecture standards

• Drive continuous improvement, innovation, and adoption of modern technologies

• Collaborate cross-functionally to ensure platform adoption across the enterprise

• Present at senior leadership forums and influence key decision-makers

• Promote a culture of excellence, curiosity, and operational discipline

What You’ll Bring

• Proven leadership of data engineering teams within a complex organisation

• Expertise in ETL/ELT pipelines, data ingestion, processing and storage

• Strong experience with cloud data platforms (Azure, AWS, or GCP)

• Hands-on experience with SQL, Python, and modern data tooling

• A background in financial services or a regulated environment is highly desirable

• Excellent stakeholder engagement and communication skills-including presenting at senior committees

• Familiarity with regulatory data frameworks (e.g. BCBS239, IRB) a plus

Sound Like You?

You’re commercially astute, technically credible, and passionate about delivering real value from data. You’re just as comfortable building strategy as you are engaging your team or presenting to board-level stakeholders.

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AI/LLM DevOps Engineer

Up to £95,000 + 5% Bonus

Remote (London-Based)

Are you a cloud-savvy DevOps Engineer with a passion for AI, LLMs, and modern infrastructure? I’m hiring for a brilliant opportunity with a global professional services firm that’s pushing the boundaries of legal tech-and they’re looking for a sharp mind to help lead the charge.

This role sits at the heart of an enterprise AI/LLM transformation, supporting the deployment and optimisation of cutting-edge AI applications within a secure, scalable cloud environment.

Why This Role?

This is a rare chance to combine your DevOps expertise with innovative LLM/GenAI projects that are actively reshaping how a highly regulated industry delivers value. You’ll work cross-functionally with product owners, engineers, infrastructure, and security teams to build robust, production-grade AI solutions.

️ Your Responsibilities

• Lead deployment of AI/LLM cloud solutions using Infrastructure-as-Code (IaC) on Azure.

• Automate and optimise CI/CD pipelines, build systems, and release workflows.

• Drive secure design and ensure resilience, compliance, and observability.

• Partner with internal tech teams and external vendors on infrastructure and support.

• Act as a technical lead across key AI initiatives-owning from planning to execution.

• Provide Level 3 support and proactively resolve production issues.

• Stay at the forefront of AI/ML, NLP, and LLM trends and integrate relevant innovations.

The Tech Stack

• Azure: Azure Document Intelligence, Azure Networking & Security

• IaC Tools: Terraform or ARM Templates (experience expected)

• Languages: Python preferred (especially for AI/ML integration)

• DevOps & Automation: CI/CD tools, monitoring, security automation, scripting

✅ What You’ll Bring

• 5+ years in Infrastructure/DevOps; 3+ years in Azure environments

• Strong interest in (or exposure to) LLM/GenAI projects

• Experience deploying enterprise-grade cloud applications with IaC

• Sound understanding of AI/ML frameworks and modern DevOps practices

• Excellent communicator-comfortable translating technical complexity

• Curious mindset with a commitment to quality, security, and collaboration

What’s in It for You?

• Salary up to £95,000 + 5% annual bonus

• Hybrid working model with flexible UK location

• Cutting-edge AI/LLM projects in a forward-thinking enterprise

• Inclusive, collaborative culture with strong leadership support

• Career growth, innovation exposure, and a mission-driven team

Interested?
If you’re excited about working at the intersection of DevOps and AI, and want to contribute to a game-changing transformation, hit apply or reach out. Even if you don’t meet every requirement – let’s talk!

To Apply for this Job Click Here

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Product Owner

Rotterdam, The Netherlands (3 days a week on site)

Up to 65k annually

Ready to Shape the Future of Maritime SaaS Solutions? Join a forward-thinking organization at the intersection of technology and global shipping.

The Company

This company is a medium-sized organization headquartered in Rotterdam, operating in the maritime industry. With a strong focus on safety, sustainability, and digital innovation, our team supports both onshore and offshore operations. Our dedicated Digital Services department delivers IT and software solutions that keep our business moving.

Role

We are looking for a Product Owner to take the lead on a SaaS application used by our commercial teams. This platform plays a critical role in tracking vessels, managing operational data, and supporting key business processes. You’ll sit at the heart of development and user engagement – bridging the gap between external developers and internal stakeholders while shaping the roadmap for future enhancements, including AI-driven features.

Responsibilities

• Act as the primary point of contact for the SaaS application used by commercial teams.
• Collaborate with external developers to manage feature development, fixes, and enhancements.
• Gather requirements, prioritize the backlog, and ensure smooth delivery of updates.
• Work closely with end-users to understand challenges, provide solutions, and improve user experience.
• Explore and propose AI capabilities and other advanced functionalities for the platform.
• Support BI and analytics tasks related to the application, offering insights where needed.

Skills & Experience

• 3+ years of experience as a Product Owner in a SaaS or digital product environment.
• Strong communication and stakeholder management skills.
• Ability to work autonomously and proactively solve problems in a flat organizational structure.
• Flexible mindset, comfortable juggling multiple priorities and hands-on tasks.
• Exposure to BI/analytics and familiarity with data-driven decision-making is a plus.
• Background in maritime, logistics, or similar industries is advantageous but not essential.

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COMMERCIAL DATA ANALYST

£42,000 – £53,000

LONDON – 1-2X A WEEK

*Please note, this company is unable to sponsor, and you must be a UK resident to apply*

THE COMPANY

Join a dynamic global company that has evolved from a publishing icon into a leading multimedia and brand consultancy business. With a focus on storytelling, data, and creative brand engagement, the company partners with major international clients to deliver unique campaigns, media content, and immersive experiences. Now operating across five continents, it continues to grow through innovative services such as corporate events, digital content, media licensing, and consultancy, making it an exciting time to be part of its expanding, content-driven team.

THE ROLE

This client is looking for a commercially minded data analyst to join and help turn complex data into actionable business insights. In this role, you’ll partner with teams across the business to gather and connect data from systems like Salesforce, NetSuite, and Google Analytics. You’ll create clear, reliable dashboards and play a key part in strategic planning, delivering insights on pricing, product performance, market trends, and customer satisfaction. From building automated reports to supporting forecasting and marketing analysis, you’ll help drive smarter decisions across the organisation.

SKILLS + EXPERIENCE

• Strong SQL a requirement (Python too is a nice to have)
• Any data visualisation tool experience, ideal if DOMO
• Experience working in an individual contributor role, or smaller data team – a self-starter is a must!
• Background in digital, retail, tech or FMCG

HOW TO APPLY

If this sounds like the role for you, swiftly send over your CV to Izzi at Harnham by using the link below.

To Apply for this Job Click Here

To Apply for this Job Click Here

SENIOR ANALYST

UP TO £90,000

LONDON – 2X A WEEK

*Please note, this company is unable to sponsor, and you must be a UK resident to apply*

THE COMPANY

This is a leading business in the circular economy, focused on giving used books a new life. Through a combination of technology, sustainability, and global logistics, they collect, sort, and resell millions of pre-owned books each year via various online channels. Their mission is to make quality books accessible and affordable while reducing waste and promoting reuse. With a strong emphasis on data and innovation, they continuously optimise their operations to drive environmental impact and commercial success.

THE ROLE

This client is looking for a data-driven analyst to lead supply and operations analytics, with a focus on stock levels, supply chain performance, warehouse optimisation, and cost analysis, particularly around shipping. You’ll design and run A/B tests to improve fulfilment strategies, assess supplier behaviours, and help drive efficiency across the operation. Proficiency in SQL, Python, and data visualisation tools like Tableau is essential, as is the ability to guide and mentor at least one direct report through high-impact analytics projects. This role offers the opportunity to shape their growth and transformation strategy, with flexibility to specialise further in supply-side or demand-side analytics based on your interests and team priorities. They are a very customer-focused business being a trading business, and so you will always be thinking about the customer!

SKILLS + EXPERIENCE

• Strong supply chain, operations, or inventory analytics experience.
• Skilled in A/B testing and experimentation-ensuring tests are designed and analysed correctly.
• Technical proficiency: SQL, Python, Tableau (or similar BI tools).
• Previous mentoring or people management experience.
• Good communication skills – you need to be able to work with seniors and translate to non-technical team members
• Entrepreneurial mindset

HOW TO APPLY

If this sounds like the role for you, swiftly send over your CV to Izzi at Harnham by using the link below.

To Apply for this Job Click Here

To Apply for this Job Click Here

COMMERCIAL MANAGER

UP TO £60,000 + BONUS

LONDON – 3X A WEEK (EVERY OTHER WEEK)

*Please note, this company is unable to sponsor, and you must be a UK resident to apply*

THE COMPANY

This UK-based digital lender specialises in simplifying credit access through mobile-first credit cards.

THE ROLE

The client is looking for a commercially-minded lifecycle and growth lead to own and deliver a strategic roadmap across multiple payment products, including Buy Now Pay Later and instalment plans. In this end-to-end role, you’ll design and execute lifecycle campaigns, using customer data and performance insights to shape strategy and drive decisions. You’ll collaborate closely with analytics and tech teams to optimise pricing and profitability, identify commercial opportunities across customer touchpoints, and act as the commercial lead on cross-functional projects. A strong test-and-learn mindset is essential, as you’ll embed experimentation across all lifecycle initiatives to continuously improve outcomes.

SKILLS + EXPERIENCE

• Strong understanding of customer journeys, lifecycle campaigns, and optimisation strategies
• Someone analytical and numbers-driven – confident interrogating data and recommending improvements
• Experience working on installment plans or balance transfers
• Must be capable of influencing and potentially growing into a leadership role
• Able to work closely with product and tech teams, and drive forward multi-functional projects
• Commercial mindset with a passion for delivering both customer and business value
• Excellent communicator – confident presenting back to senior stakeholders

HOW TO APPLY

If this sounds like the role for you, swiftly send over your CV to Izzi at Harnham by using the link below.

To Apply for this Job Click Here