Job Description

Title: Full Stack Developer
Reports to: Engineering Manager
Location: London (Hybrid, 2 days office based per week)
Type: Full-Time, Permanent
Salary: 40,000-54,000 + Benefits + EMI options
Candidates must be eligible for Security Clearance
Join Our Mission
At QuantSpark, we're transforming how data and AI serve society. Our team partners with forward-thinking organisations across multiple sectors to harness the power of analytics and artificial intelligence, creating meaningful impact that extends far beyond financial outcomes.
What you bring

• A commitment to constant learning and professional improvement.
• One to three years progressive full-stack engineering experience.
• At least one year of demonstrated experience programming with one or more Python frameworks (e.g., Flask, FastAPI, Django, etc).
• Excellent communication and interpersonal skills, with the ability to collaborate effectively with internal and external teams.
• Commercial experience with JavaScript or TypeScript (ideally React).
• Experience with RESTful APIs.
• Experience in code management tools as Git and package managers (e.g., pip, poetry, uv, npm, or yarn).
• Ability to write clean, efficient, and maintainable code, unit tests, and documentation, following best practices and coding standards.
• Strong problem-solving and analytical skills.
• You take accountability and can work both independently and as part of a team.
• Experience creating user interfaces for web applications.
• Familiarity with database systems such as PostgreSQL, MySQL, or MongoDB.
• At QuantSpark, we value growth and learning, and are looking for individuals to join our team who can work both autonomously and collaboratively with our internal team and clients.

Nice to have

• Experience with AWS services.
• Strong experience in unit testing and TDD.
• Experience with GenAI development tooling (e.g., Cursor, Kilo Code, Co-Pilot, etc).
• Experience with System Design. (e.g., system design components, CAP theorem/concept).
• A keen eye for good user interface design and user experience.
• Experience with Python packages used for data science (familiarity with Pandas, Numpy, Scikit, Tensorflow).
• Knowledge of containerisation technologies (Docker, Kubernetes).

What you'll do

• As a Full Stack Engineer, you will build and support well-designed, tested, and scalable web applications using your skills in both frontend and backend development.
• You will work both on the backend (e.g., Python/API endpoints) and frontend (e.g., TypeScript/React) features.
• You will have direct, commercial experience working on Python, TypeScript, and more within cross-functional teams.
• You will support the development of client-facing functionality, such as web applications, from detailing requirements, designing, and developing a solution, to testing and validating that the solution matches user expectations
• You will be part of the development of client-facing features for our B2B SaaS products, encompassing requirements gathering, solution design, iterative development, and thorough testing to ensure the final product meets user needs and business objectives.
• In this role, you will provide technical support and upkeep of existing infrastructure, identify and diagnose software issues, and assist in maintaining and upgrading applications as needed, while learning alongside senior engineers

Our impressive client portfolio:

• Private Equity & Financial Services: We work with top-tier investment firms, global financial institutions, and leading wealth management companies, providing portfolio performance analytics, AI-powered value creation, and risk identification tools.
• Retail & Consumer: Our solutions help major national retailers, high-street brands, and premium consumer goods companies optimise inventory, enhance price competitiveness, and deliver personalised customer experiences.
• Asset Management: We build AI-powered investment decision support systems, alternative data integration platforms, and automated risk management solutions for prestigious asset management firms.
• Public Sector: We're trusted by multiple UK government departments and public sector organisations to deliver predictive maintenance systems, supply chain optimisation, and process automation.
• SaaS, Manufacturing & More: From innovative SaaS providers to global manufacturing leaders, our cross-industry expertise ensures we bring diverse perspectives to complex challenges.

Why You'll Love QuantSpark

• Work That Matters: Lead high-impact analytics projects across diverse sectors--from building predictive models that help private equity firms identify value creation opportunities to creating inventory optimisation algorithms for household-name retailers. Tackle Exciting Challenges: Design and implement technically sophisticated solutions such as real-time analytics platforms for FTSE 100 companies, automated risk assessment systems for asset managers, and predictive maintenance pipelines for government departments.
• Shape Technical Standards: As a growing consultancy, you'll help define our analytics engineering practices, tooling choices, and data architecture patterns that will serve as the foundation for our continued growth.
• Work Alongside Brilliant Minds: Collaborate with exceptionally talented colleagues who bring diverse expertise from leading universities, top tech companies, and varied industry backgrounds--all united by intellectual curiosity and a drive to solve meaningful problems.
• Innovate with Purpose: Explore cutting-edge approaches to analytics engineering, from modern data stack implementations to GenAI tooling, ensuring QuantSpark stays at the forefront of the industry.

Benefits

• 6,000 annual training & conference budget to keep you at the cutting edge of analytics engineering.
• Up to 6% matched pension for your long-term security.
• Comprehensive private healthcare through Vitality.
• Work from anywhere in the world for up to one month per year.
• 25 days holiday plus flexibility to buy/sell up to 5 additional days.
• Sustainable commuting support through our cycle to work scheme.
• Engaging Central London office environment with quality refreshments, regular team socials, and a vibrant atmosphere.
• Exclusive discounts on retail, travel, technology, and fitness memberships.
• Access to cutting-edge analytics tools and platforms.
• Regular tech talks, knowledge sharing sessions, and innovation time.

Equal Opportunities
QuantSpark is an equal opportunities employer and as such makes every effort to ensure that all potential employees are treated fairly and equally, regardless of their sex, gender, sexual orientation, marital status, race, colour, nationality, ethnic or national origin, religion, age, or disability.