Senior Full Stack Developer, QuantSpark
+ EMI share options scheme & Bonus
2+ days a week in office (Southwark, London)
QuantSpark is revolutionising how data and AI serve society
Open for applications
QuantSpark is revolutionising how data and AI serve society
21-100 employees
Open for applications
+ EMI share options scheme & Bonus
2+ days a week in office (Southwark, London)
21-100 employees
Company mission
To pioneer the strategic application of data science and software development to improve commercial decision-making.
Role
Who you are
- You’re an experienced full-stack engineer (4+ years), with at least 1 year in a senior or lead role, regularly mentoring others.
- You have a track record in designing and delivering enterprise-grade web applications and APIs
- You’re deeply knowledgeable in Python backend frameworks and modern frontend frameworks (React/TypeScript), and comfortable across the full product lifecycle
- You enjoy solving complex technical problems, delivering elegant code, and driving architectural decisions
- You’re proactive, accountable, and collaborate well in fast-paced, cross-functional teams
- You’re excited by autonomy, and the chance to shape both team standards and technical direction
What the job involves
- Reporting to: Engineering Manager
- Here, you’ll compress 5–10 years of traditional career progression into 2–3 years. From day one, you’ll lead end-to-end projects, access leadership directly (including the CEO), and build cross-industry expertise that usually takes a decade to gain
- We don’t just develop—we build, own, and scale solutions that shape the organisations we work with and have meaningful societal impact
- As a Senior Developer, you’ll design, build, and scale robust, impactful web applications using both backend and frontend technologies
- Drive the architecture, design, and delivery of scalable, secure, and maintainable software solutions for commercial clients across multiple sectors
- Guide and mentor junior developers through hands-on leadership, code reviews, and knowledge-sharing
- Write, review, and own high-quality code primarily in Python (using frameworks like Flask, FastAPI, or Django) and JavaScript/TypeScript (preferably React)
- Develop and maintain RESTful APIs and modern user interfaces, ensuring an excellent user experience and technical excellence
- Work directly with clients providing technical expertise and guidance
- Work with cross-functional teams to gather requirements, design solutions, and deliver features that make a meaningful impact
- Contribute to system design and technical strategy, leveraging experience with cloud (e.g., AWS), containers (Docker/Kubernetes), and database systems (PostgreSQL, MySQL, or MongoDB)
- Collaborate closely with Data Engineers on data pipelines and large-scale data processing
- Champion best practices in software engineering, TDD/unit testing, and documentation
- A team of technical entrepreneurs who think differently and thrive on technical challenge
- Colleagues who share openly, challenge constructively, and grow together
- Clients who are ambitious enough to reimagine how data and technology transform their organisations
- In 3–5 Years I Want to Be:
- Leading end-to-end technical programmes where my architectural and product designs set benchmarks
- Trusted by senior stakeholders for both my technical depth and strategic perspective
- Driving innovation in a company that’s scaling fast—not waiting around for slow promotions
- We partner with forward-thinking organisations across sectors:
- Private Equity & Financial Services: Portfolio analytics, AI-powered value creation, and risk management tools for global investment and wealth firms
- Retail & Consumer: Pricing optimisation, inventory efficiency, and personalised engagement for major UK retailers and brands
- Asset Management: Advanced investment platforms and automated risk management for asset managers
- Public Sector: Trusted by multiple UK government departments for fraud analytics, predictive maintenance, and supply chain optimisation
- SaaS & Manufacturing: Sector-spanning technology transformation for SaaS innovators and manufacturers
Salary benchmarks
Our take
QuantSpark helps governments and businesses to strategically apply data science through the development of complex decision-making software. Primarily, its work involves analysing large datasets and systems in order to understand customer behaviour and help clients make informed decisions for strategic planning in sales and marketing.
In recent years, big data has become central to the operation of businesses large and small, and this has led to great demand for data scientists fluent in sophisticated modelling and analysis. QuantSpark seeks to go a step further, providing a service which combines data science with commercial insight- effectively providing both services through one transaction. By doing this, QuantSpark hopes to offer clients a more meaningful insight into their data than a standard consultancy could.
Already, the company has an impressive client list, including the UK Government, the Australian Government and Bain Capital. QuantSpark's tools and solutions are developed to become embedded in its clients' operations, ensuring a long-lasting relationship between them, and meaning that, as QuantSpark continues to expand its client base, its model should allow it to see continued success in the future.
Steph
Company Specialist at Welcome to the Jungle
Insights
32% female employees
30% employee growth in 12 months
Glassdoor (3.4)
Company
Company benefits
- Tech for good: We are passionate about giving our team the chance to have a real social impact and will have the opportunity to work on a wide variety of impactful projects
- Training budget: Everyone in QuantSpark has £6,000 training budget and 12 ring-fenced days a year to spend on their own professional development
- Work abroad for up to 1 month per year
- Generous EMI Share Options scheme
- Socials: We're a social bunch and love to get to know each other
- Hybrid working (2-3 days in office per week)
- Dog friendly office
- Cycle to work scheme. Onsite showers
- 25 days annual leave + bank holidays + buy/sell 5 days annual leave
- Pension matched up to 6%
- Vitality Private healthcare
Company values
- Diversity: Diversity of people and ideas is essential for wellbeing and effectiveness as teams. Our interdisciplinary approach means that we produce extraordinary outcomes for our clients and also provides significant opportunities for professional development
- Analytical Rigour: We use data to cut through cognitive biases and pursue the truth for our clients. We test and probe each other's ideas and findings to ensure we leave no stone unturned in the pursuit of being the best we can
- Teamwork: As we work together to scale up QuantSpark and support our clients in their own analytics transformation journey, we take pride in teaching, learning, developing, and sharing as a team
- Entrepreneurialism: Rolling our sleeves up. Grit. We focus on doing our best to get the best outcomes for our clients. We empower all our colleagues to think outside the box in order deliver innovation for our clients
Company HQ
London, UK
Leadership
Adam Hadley
(Co-Founder & CEO)With Master's degrees from Oxford and KCL, Adam divides their time between running QuantSpark and Tech Against Terrorism- the world's preeminent NGO helping to tackle terrorists' use of the internet.
People progressing
Anastasia is the Head of People and Operations. Anastasia joined the business as EA to Adam, the CEO, and quickly built out a department of her own which continues to expand.
Sophie joined the team in 2021 as a Senior Product Manager. They were quickly promoted to Product Lead and again to Head of Product.
Daniel joined as a Data Analyst in 2019 and now leads the Analytics Engineering Team and is an integral part of the business.
Diversity, Equity & Inclusion at QuantSpark
- QuantSpark is an equal opportunities employer committed to fair and equitable treatment for all potential employees, regardless of sex, gender, sexual orientation, marital status, race, nationality, ethnicity, religion, age, or disability.
- We utilise diversity and inclusion data to pinpoint areas of improvement to our hiring process.
- We have a flexible approach to our interview process, utilising video interviews and take-home assessments. We aim to increase the variety of our assessment styles, to offer fair opportunity to all types of candidates.
Share this job
View 5 more jobs at QuantSpark