Senior Fullstack Engineer
Confirmed on the employer's own hiring board on Sep 30, 2026. First seen by Alion on Jul 30, 2026.
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 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.