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Principal Machine Learning Engineer

New York, New York – 3 days/week hybrid

$250,000-275,000 base salary + bonus + equity

THE COMPANY

Harnham is partnering with an innovative health-tech startup building patient-focused agentic AI and LLM applications to advance capabilities in medical claims in hospitals. The AI engineering team builds scalable, data-driven solutions that personalize user experiences and equip care providers with actionable insights, all while working with large-scale infrastructure and diverse technologies.

THE ROLE

• You will be responsible for machine learning model building, development, deployment and scalability for the company’s agentic AI product across HUNDREDS of hospitals
• You will report directly to the founding team and work closely on technical direction
• Own AI infrastructure and quickly build into production, particularly focusing on novel AI and LLM applications
• You will implement and design code and build out to production using various machine learning and LLM techniques, owning machine learning workflow operations and distributed systems
• Own CI/CD pipelines for MLOps / LLMOps
• You will play an integral role of building out the AI team and scaling out its product
• Act as a thought leader role for AI across the business, mentoring junior team members

YOUR SKILLS AND EXPERIENCE

The successful Principal Machine Learning Engineer will likely have the following skills and experience:

• 10+ years of commercial experience preferred with a focus on end-to-end building and deploying machine learning and LLM models, ideally with voice, multi-modal or chatbot systems
• Experience working in a scaling startup is highly preferred
• Expertise in Python (TensorFlow, PyTorch) for production-grade work
• Commercial experience building novel AI platforms with large datasets
• History of working with and managing real-time AI applications in production settings
• Cloud experience in AWS, Azure or GCP
• DevOps experience with CI/CD pipelines required
• History of working on models from concept to production / end-to-end / 0-1
• Software engineering background preferred, MLOps experience with MLFlow, Kubeflow or similar
• Containerization experience with Docker or Kubernetes
• Experience in settings wearing multiple hats
• Domain experience in healthcare, health-tech, med-tech or similar a plus; EHR, EMR, claims, HEOR or other medical data exposure highly preferred
• History of partnering with non-technical stakeholders required
• Experience owning projects directly preferred
• BS or MS degree in Computer Science, Statistics, Applied Mathematics, Computer Engineering or similar

THE BENEFITS

A competitive base salary of $250,000-275,000 + benefits + equity

HOW TO APPLY

Please register your interest by sending your résumé to Tim Jonas via the Apply link on this page.

KEYWORDS

Machine Learning | AI | Artificial Intelligence | Technology | MLOps | LLMOps | Health-tech | Healthcare | Medical | Startup | Deployment | Production | LLMs | LLM | Large Language Models | GenAI | Gen AI | Generative AI | Voice Bots | Chatbots | Natural Language Processing | Infrastructure | Architecture | CI/CD | Continuous Integration | Continuous Deployment | EHR | Electronic Health | Electronic Medical | HEOR | Claims Data | Patient | Hospital | Docker | Kubernetes | Weights & Biases | MLFlow | PyTorch | TensorFlow | Publications | Patents

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Lead AI Engineer
London
£130,000 – £140,000 + Bonus

The Role:

A well-known brand in the UK is building an AI team in 2026, starting with 4x AI Engineers (1x mid-level, 2x Snr AI Engineers and 1x Lead AI Engineer).

The scope of the role is extremely broad, offering the chance to come in and deliver impact all business areas.

With strong investment from the board and CEO, this team will utilise the latest techniques and innovation in AI to deliver value at a business-wide level.

You will be the voice for AI within the company and be responsible for helping to an AI strategy, identifying key projects to deliver significant value and impact.

NB: This role does not involve direct people management to begin with, but there will be opportunities (if wanted) as the team grows.

You:

• Experience in leading the delivery of AI solutions within an organisation from beginning to end
• Strong technical experience across traditional data science and machine learning as well as AI
• Stakeholder management experience – utilising communication skills
• Technical leadership within the (growing) team – mentoring junior members of the team
• Innovation is a key part of this role

Salary:

In this role you can earn between £130,000 – £140,000 + benefits (including a 20% bonus OTE)

The Process:

1. Virtual Interview
2. Virtual (technical) interview
3. In-person interview

KEYWORDS

Data Scientist, Data Science, Machine Learning, Artificial Intelligence, AI, AI Engineer, LLM, RAG, Langchain.

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PRINCIPAL SOFTWARE ENGINEER

BAY AREA, CA (3 DAYS IN OFFICE)

$280,000 – $350,000+ (BASE + EQUITY)

An exciting opportunity for a hands-on Senior Software Engineer to join a lean, profitable platform connecting creators through video.

THE COMPANY

A profitable, early-stage tech company with a small Bay Area-based team. The product already reaches a significant audience and focuses on high-impact, user-generated video content.

THE ROLE

Hands-on engineering and AI work across the platform:

• Build agentic GenAI workflows using internal datasets
• Develop marketing and growth systems: email delivery, personalization, engagement tracking
• Create commercial AI models to understand user behavior and engagement
• Collaborate across product and engineering teams
• End-to-end coding, system design, and customer validation

YOUR SKILLS & EXPERIENCE

• Backend: Python, Django or Flask or FastAPI
• Frontend: React
• Cloud/Infrastructure: AWS
• Databases: PostgreSQL
• AI/ML: OpenAI; knowledge of agent systems helpful
• Experience with large-scale data and knowledge systems is a plus
• Comfortable working in a lean, high-ownership environment

HOW TO APPLY

Please register your interest by sending your resume to Calum Reid via the apply link on this page.

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Data Delivery Lead
Watford Junction | Hybrid 3 days per week
Up to £85,000 + bonus

We’re working with a well-known UK entertainment and gaming organisation undergoing a major digital and data transformation. With significant investment into modern platforms, analytics capability and CRM infrastructure, this business is shifting towards a far more customer-centric, insight-driven operating model.

The Role

This is a senior delivery and functional leadership position within the data organisation, reporting directly into the Head of BI.

You’ll act as the single point of accountability for analytics and BI delivery, owning initiatives from initial business requirement through to build, release and adoption.

While this is not a Project Manager role, it requires strong ownership of delivery, prioritisation and stakeholder management across multiple concurrent initiatives.

Key Responsibilities

• Own end-to-end delivery of BI, analytics and data products

• Act as the functional lead across Business Analysis, Data Engineering and Reporting

• Manage 3 direct reports, each owning a core vertical

• Provide indirect leadership across teams of 15-20 including permanent staff and suppliers

• Partner closely with Product Owners and senior stakeholders across Marketing, CRM, Finance and Operations

• Translate business problems into clear, deliverable analytics solutions

• Set priorities, manage dependencies and allocate resources effectively

• Balance short-term delivery with longer-term roadmap and platform planning

• Ensure teams understand upcoming work and are staffed appropriately

Team Structure

This role leads across three core functions:

• Lead Business Analyst overseeing a BA team

• Data Engineering Manager owning platform and pipelines

• Reporting Engineering Manager responsible for Power BI and reporting

You will work closely with Architecture, QA and Operations to ensure solutions are delivered in the right strategic direction.

What They’re Looking For

• Strong experience owning BI or analytics delivery in complex environments

• Proven stakeholder management and business partnering skills

• Background working with Power BI and modern reporting stacks

• Experience leading cross-functional delivery teams

• Comfortable operating at both strategic and hands-on levels

• Able to challenge, prioritise and drive outcomes rather than simply report progress

Experience in regulated industries or high-volume consumer environments is beneficial but not essential.

Why This Role

• Senior leadership position with genuine ownership of data delivery

• High visibility across the business with executive stakeholder exposure

• Opportunity to shape how BI and analytics are embedded into decision making

• Clear impact on revenue growth, cost reduction and operational efficiency

• Hands-on role that stays close to delivery without micromanaging teams

• Hybrid working model with long-term transformation underway

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Principal/Founding AI Engineer specializing in Agentic GenAI & Medical Data

Company Overview

Join a rapidly growing medical-tech startup, backed by $75M+ in funding, building a 3-sided marketplace transforming how healthcare connects, transacts, and personalizes patient experiences. We’re a product-led, remote-friendly team with engineering and commercial operations in the US and Croatia.

Role Overview

As a Senior Software Engineer, you’ll architect and develop agentic GenAI workflows leveraging Python, Django, and cutting-edge AI/ML tools. You will be responsible for designing internal platforms built on sensitive medical datasets, deploying market-facing solutions, and collaborating closely with commercial and AI teams to iterate rapidly.

Key Responsibilities

• Build agentic GenAI workflows using proprietary and medical datasets.
• Lead GenAI & workflow orchestration for healthcare data and knowledge management.
• Develop and optimize marketing technology: email delivery, user engagement, personalization solutions, and growth engineering initiatives.
• Prototype, productize, and validate commercial AI models-understand and model clinician behavior, prescription workflows, and intelligent decision systems.
• Write production code for backend (Python/Django), ensure robust system architecture, and lead technical implementation cycles.
• Partner with cross-functional teams across the US and Croatia to deliver rapid, validated product iterations.

Skills & Experience

• Proven backend expertise: Python and Django in production environments.
• Frontend experience: React (modern best practices).
• Cloud/infrastructure: AWS (deploying, scaling, monitoring).
• Databases: PostgreSQL; ability to optimize for large medical/structured datasets.
• AI/ML: Experience with OpenAI and agent knowledge systems strongly preferred. Track record training or managing AI agents a plus.
• Nice-to-have: Direct experience handling medical/healthcare data.
• Scalability: Experience architecting knowledge systems with large-volume data indexing, not high-throughput but focused on effective information retrieval.

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About the Role

Join a YC-backed seed-stage startup as an early ML hire, owning end-to-end model development for underwriting, risk scoring, and credit decisioning. You’ll work directly with founders to build production models that drive revenue and portfolio performance.

What You’ll Do

• Design, build, and deploy production ML models in Python for underwriting, risk scoring, and credit decisioning.
• Develop an elastic underwriting model that adapts to platform changes, cash flow dynamics, and evolving user behaviors.
• Implement feedback loops to analyze performance month-over-month, continuously refining risk thresholds and model features.
• Own the full ML lifecycle: data exploration, feature engineering, training, deployment, monitoring, and iteration.
• Integrate models with the TypeScript backend (Node.js/Express, Next.js, React Native) to power decisioning flows.
• Build high-quality datasets using financial data from Plaid, Stripe, and PostgreSQL (via Supabase).
• Contribute to ML infrastructure design on GCP, including model serving, orchestration, and observability.

Tech Stack

• Backend: Node.js/Express, Next.js, React Native (TypeScript)
• Data: PostgreSQL (Supabase), GCP
• Integrations: Plaid, Stripe
• ML: Python-based modeling and deployment

What We’re Looking For

• 2-4 years of professional experience deploying ML models to production.
• Strong Python skills with ML frameworks (scikit-learn, TensorFlow, PyTorch, XGBoost).
• Experience with risk scoring, credit decisioning, fraud detection, or similar applications.
• Familiarity with threshold optimization, calibration, and precision/recall tradeoffs in risk contexts.
• Comfortable working with PostgreSQL and cloud platforms (GCP preferred).
• Thrives in fast-paced, ambiguous environments with end-to-end ownership and quick iteration.
• Strong collaboration and communication skills across technical and non-technical teams.

Nice to Have

• Experience with Plaid, Stripe, or other financial data APIs.
• Background in fintech, lending, or credit underwriting.
• Experience building data/ML pipelines in early-stage startups.
• Experimentation experience (A/B testing, holdout validation).

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DATA ANALYST

GILLINGHAM – 3 DAYS A WEEK ONSITE

UP TO £60,000

THE COMPANY

This is a business on a real data journey. They’re scaling fast, investing heavily in analytics, and putting data at the centre of how they improve performance. If you want to join a company where analytics genuinely drives decisions, this is a great place to do it.

THE ROLE

As a Data Analyst, you’ll sit at the heart of how the organisation understands its operations. You’ll be digging into operational and service-centre data, mapping out full customer and process journeys, and turning numbers into clear, actionable insight for senior leadership. Reporting, dashboarding and performance analysis are a huge part of the role, and you’ll work closely with finance, ops and leadership to highlight what’s working – and where the opportunities are.

You’ll be responsible for:

• Exploring complex operational datasets to surface trends, issues and opportunities
• Mapping end-to-end processes and identifying areas for efficiency
• Building and owning Power BI dashboards used for real-time decision-making
• Presenting insight and recommendations to senior stakeholders
• Maintaining data quality and consistency across systems
• Highlighting data/process gaps and supporting business cases for change

YOUR SKILLS & EXPERIENCE

To be successful, you’ll need:

• Proven experience as a Data Analyst, ideally within retail, automotive or manufacturing
• Strong Power BI capability
• Solid SQL for pulling and interrogating large datasets
• Advanced Excel skills
• Experience creating dashboards and visualisations
• Strong communication skills, with the ability to translate data for non-technical teams
• Python experience is a nice-to-have, not a must

THE BENEFITS

• Salary up to £60,000
• Opportunity to shape the analytics function as it grows
• Direct exposure to senior decision-makers

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Head of Data Delivery

Watford Junction | Hybrid

Up to £90,000

A senior data leadership role responsible for owning the end-to-end delivery of data products, analytics and reporting across a large, regulated organisation. This isn’t a project management role. You’ll be accountable for what gets delivered, why it matters, and how teams are set up to deliver high-quality data products that drive real business value.

The role:

You’ll act as the single point of contact for data delivery, owning prioritisation from initial business requirement through to development completion. Working closely with Product Owners and senior stakeholders, you’ll balance strategic initiatives with high-impact smaller pieces of work, ensuring delivery is efficient, well planned and aligned to business goals. You’ll lead three core functions – Business Analysis, Data Engineering and Reporting.

What you’ll be doing:

• Owning the end-to-end delivery of data products, dashboards and data feeds
• Acting as the single point of contact for analytics and reporting delivery
• Partnering with Product Owners and senior stakeholders to shape priorities
• Translating business problems into clear, deliverable data solutions
• Leading planning and prioritisation across BA, engineering and BI teams
• Ensuring delivery quality, efficiency and consistency across the function
• Keeping teams focused on initiatives that drive commercial and regulatory impact
• Staying close enough to the detail to challenge, support and guide teams effectively

Your skills & experience:

• Extensive experience leading BI, analytics or data delivery functions
• Proven delivery of complex, large-scale data or analytics programmes
• Strong background in business partnering and stakeholder management
• Comfortable owning prioritisation, trade-offs and delivery outcomes
• Experience working across Business Analysts, Engineers and BI teams
• Hands-on understanding of reporting and analytics (Power BI preferred)
• Experience in regulated or complex environments is highly beneficial
• Able to quantify and communicate the value of data products to the business

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Data Delivery Lead

Location: Watford (Hybrid – 3 days per week in the office)
Type: Full-time
Function: Business Intelligence / Data

Overview

Our client is a large, regulated, consumer-facing organisation undergoing a major data and analytics transformation. They are investing heavily in modern BI capabilities and are seeking a senior Data Delivery Lead to partner with the business and drive high-impact analytics delivery.

This role combines strategic ownership of the BI roadmap with hands-on expertise and strong stakeholder leadership.

Key Responsibilities

• Own and deliver a domain-level BI and analytics roadmap aligned to business priorities
• Act as senior BI partner to key business functions (e.g. Finance, Marketing, Operations)
• Lead and mentor Business Analysts and BI specialists, setting best practices and standards
• Oversee end-to-end analytics delivery (requirements → build → UAT → release)
• Provide expert guidance on BI tools (Power BI or equivalent), including modelling and optimisation
• Ensure data quality, governance, and compliance in a regulated environment
• Drive adoption of self-service analytics and reduce ad-hoc reporting demand
• Champion innovation and continuous improvement across reporting and analytics

Skills & Experience

• Extensive experience in BI / analytics delivery
• Strong background in regulated or complex data environments
• Proven stakeholder management and business-partnering capability
• Hands-on Power BI (or equivalent) expertise
• Experience owning analytics roadmaps and prioritising competing demands
• Strong people leadership and mentoring experience
• Solid understanding of data governance, privacy, and compliance

Desirable

• Cloud data platform exposure (AWS preferred)
• Experience in large-scale transformation programmes

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FinOps Data Analyst Up to £47,000 | Leicester | Hybrid (4 days onsite)

About the Role We’re working with a major UK retail brand to hire a FinOps Data Analyst for their Finance Analytics team. You’ll provide analytical support and reporting solutions across multiple finance functions, working closely with SQL engineers and Finance stakeholders.

This hands-on role uses SQL and Python daily to explore data, identify trends, and deliver actionable insights that drive financial decision-making. The team is modernising their data platform with Databricks and Medallion Architecture.

Key Responsibilities Build analytical solutions across 4 finance areas: Accounts Payable, Cash Accounting, Commercial Services, and Operations. Perform SQL-based data exploration, validation, and transformation. Use Python (Pandas/Numpy) for analysis, automation, and data profiling. Build Power BI dashboards to visualise financial metrics. Support analysis by exploring trends and anomalies. Engage with stakeholders to gather requirements and deliver analytical outputs.

Current Projects Databricks Modernisation: Exposure to Databricks as the team builds Gold Standard Medallion Architecture. Self-Service Analytics: Reducing queries (currently 60-70% of workload). BAU Finance Support: Ongoing analytics across AP, Cash, Commercial Services, Operations. Analytical Automation: Using Python/SQL to streamline recurring analysis. Future ML/AI: The team will explore machine learning applications.

Requirements Essential: Strong SQL (querying, joins, CTEs, window functions). Python for data analysis (Pandas, Numpy). Power BI experience (dashboard creation). Strong analytical mindset and communication skills. Able to work onsite in Leicester 4 days/week (5 days first 3 months).

Desirable: Databricks or modern cloud data platforms. Finance team or financial data experience. Data warehousing knowledge.

What You’ll Get Salary up to £47,000. Modern data tech (Databricks, Medallion Architecture). ML/AI exposure as team evolves. Hybrid working (4 days onsite after training). Career development in major UK retailer.

Interview Process Stage 1: Informal discussion with Analytics Manager (45 mins, virtual). Stage 2: In-person assessment (3 hours total) – 2 hours analytical task using SQL/Python on provided dataset, 1 hour discussion reviewing your approach.

Working Arrangements First 3 months: 5 days/week onsite for training. After 3 months: 4 days/week onsite, 1 day remote.

To apply, submit your CV or contact us for more information.

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