---
title: 'Senior Fullstack Engineer at Hook'
canonical: 'https://feeny.ai/job/senior-fullstack-engineer-hook-london-kq5vrf860840'
type: 'job'
last_seen: '2026-09-11'
---

# Senior Fullstack Engineer at Hook

- **Company:** Hook
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Posted:** 2026-07-30
- **Last confirmed live:** 2026-09-11
- **Apply:** https://jobs.ashbyhq.com/hook/d32be795-e08a-4686-90b2-443baf89199f

## Job description

## About Hook

We’re building the future of customer growth. At Hook, we use AI and Machine Learning to help businesses predict revenue with accuracy, drive customer loyalty, and capture massive value from their existing customers. We’re a Series A company who ranked 33 out of 100 on the [Sifted](https://sifted.eu/leaderboards/sifted-100-uk-ireland-2025) fastest growing startups and we have raised $multi-million in funding from some of the top investors in Europe and the US (e.g. Balderton Capital and Lightspeed) and have an enviable list of customers that we’re working with including some of the fastest growing companies in the world. We’re looking for ambitious people that want to be part of our meaningful vision of changing how businesses engage with their customers, and of building one of the world’s leading workplaces for great people along the way.

## Responsibilities

As a Senior Software Engineer at Hook, you'll work across the stack (with a backend focus) to build products and platform capabilities that directly impact our customers. Your day-to-day will include:

- Working closely with engineers, product managers and designers to design and deliver customer-facing features
- Building clean, well-tested and maintainable software across our Python backend and React frontend
- Owning significant areas of our architecture and driving technical improvements
- Designing scalable APIs, services and data models
- Reviewing code and mentoring other engineers through thoughtful, constructive feedback
- Improving engineering practices, tooling and development workflows across the team
- Monitoring, maintaining and improving the performance and reliability of our production systems
- Integrating with third-party platforms and services to extend our product capabilities

As we continue to grow, you'll have the opportunity to take ownership of increasingly complex technical challenges and help shape both our product and engineering organisation.

## Requirements

We're looking for an ambitious, collaborative engineer who enjoys solving difficult problems and wants to make a meaningful impact in a fast-growing company. You'll ideally have:

- Experience building production software across both frontend and backend technologies (backend-focused)
- Strong experience with Python and frameworks such as FastAPI, Django or Flask
- Experience designing, building and operating software in production environments
- Experience working with APIs and integrating third-party services
- Strong communication skills and the ability to collaborate effectively across technical and non-technical teams
- A pragmatic approach to problem-solving and a passion for writing high-quality software

Desirable

- Experience with cloud platforms such as AWS
- Experience working with AI-powered products, machine learning systems or data-intensive applications
- Experience designing scalable distributed systems

Salary: £85,000-£105,000 (depending on experience)

## Benefits

🏖️ 27 days holiday (option to buy and sell holiday) + bank holidays 📈 Generous stock options 🏥 Private health insurance so you can get the best care you need 🧘 Flexible monthly wellness allowance that you can use monthly on things like gyms, yoga, mental health & healthy food 📚 Annual learning & development budget for every employee 🏢 Flexible working - we’ll all come together three days a week but otherwise you can work from home or come into our awesome office in Liverpool Street 💻 The best equipment for everyone to work with Our founder and team are incredibly passionate about creating a company culture that is diverse, inclusive, productive and enjoyable for all our colleagues. As part of a growing start-up team, we expect a lot from you and will work hard to make sure you have everything you need to be at your best.

## About Hook

## Core Business
- **Primary industry**: AI-powered Customer Success software
- **Target customers**: B2B, mid-market to enterprise SaaS companies with dedicated Customer Success teams
- **Mission**: “Build a new world for Customer Success, powered by AI” – maximise revenue without adding headcount [hook.co](https://hook.co/)

## Products & Services
- **Echo**: AI agent that monitors customer health, predicts churn up to 6 months in advance with 90%+ accuracy, and recommends next actions [hook.co](https://hook.co/).
- **Activator**: AI agent that creates personalised onboarding paths for each customer, adapting in real-time to drive activation [hook.co](https://hook.co/).
- **Hook Platform**: Connects product usage, revenue data, and customer interactions to provide a unified view; automates digital work and surfaces executive-ready insights with a chat interface [hook.co](https://hook.co/).

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total Funding $14.3M (Series A $8.7M in December 2023, Seed $2.8M in April 2021) [linkedin.com](https://uk.linkedin.com/company/hook-technology)
- **Notable Investors/Partners**: Backed by top early-stage European investors (specific names not listed in public sources); customers include GWI and hackajob [hook.co](https://hook.co/).
- **Growth Signals**: 24.6% YoY headcount growth (52 employees), 8 open positions, annual revenue range $1M–$5M, SOC 2 and ISO 27001 certified [linkedin.com](https://uk.linkedin.com/company/hook-technology) [hook.co](https://hook.co/).

## Competitive Advantages
- Predictive accuracy: 93% churn prediction accuracy and 85% accuracy predicting renewals 180 days out [hook.co](https://hook.co/).
- AI agents that not only surface insights but execute actions (e.g., automate email nudges, CRM triggers) – “100% of the digital work” can be automated [hook.co](https://hook.co/).
- Integrates with existing systems with minimal lift; no in-house data science required.
- Security certifications (SOC 2, ISO 27001) build trust with enterprise buyers [hook.co](https://hook.co/).

## Strategic Focus
- Scaling Customer Success teams through AI automation, reducing manual work by 50% and freeing up 25–35% more efficiency [hook.co](https://hook.co/).
- Expanding agent capabilities to cover the full customer lifecycle (onboarding, risk, renewal, expansion).
- Growing customer base among mid-market and enterprise SaaS companies, with a strong emphasis on data-driven outcomes.

## Why Work Here
- **Culture**: “Ambitious people who want to be part of a like-minded team” – the company is “incredibly passionate about building a diverse and inclusive workplace” [hook.co](https://hook.co/about-us/).
- **Work model**: In-office at the London headquarters (Great Winchester Street) with flexible working space; Built In lists “OnSite Workspace” for all roles [builtin.com](https://builtin.com/company/hook-hookco).
- **Perks**: Equity for all employees, private medical insurance, flexible wellness budget, annual learning & development allowance, twice-weekly team lunches, and regular socials [hook.co](https://hook.co/careers).
- **Employer rating**: 4.7/5.0 on LinkedIn (46 reviews), with culture rated 4.9, compensation 4.6, and career growth 4.7 [linkedin.com](https://uk.linkedin.com/company/hook-technology).
- **Open roles**: Backend/Fullstack Engineer, Front End Engineer, Enterprise Account Executive, Sales Development Representative, Account Manager, and more [hook.co](https://hook.co/careers) [jobs.ashbyhq.com](https://jobs.ashbyhq.com/hook).

## Sources
1. [hook.co](https://hook.co/)
2. [hook.co/careers](https://hook.co/careers)
3. [hook.co/about-us](https://hook.co/about-us/)
4. [builtin.com/company/hook-hookco](https://builtin.com/company/hook-hookco)
5. [linkedin.com/company/hook-technology](https://uk.linkedin.com/company/hook-technology)

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