Senior Developer

Reporting to: Engineering ManagerOffice Environment: Hybrid (minimum two days per week)Type: Full time, permanentJoin Our Mission

Skip the queue. Shape the future. See real impact.At QuantSpark, we’re transforming how data and AI serve society. We combine the analytical discipline of strategy consulting with the pace and ownership of a scale-up. That means you’ll work directly on the problems that matter most—whether combating economic crime, modernising government services, or accelerating commercial growth for FTSE 100 companies.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.The Client Portfolio

We partner with forward-thinking organisations across sectors:Private Equity and Financial Services:

Portfolio analytics, AI-powered value creation, and risk management tools for global investment and wealth firms.Retail and 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 and Manufacturing:

Sector-spanning technology transformation for SaaS innovators and manufacturers.The Role

As a

Senior Developer , you’ll design, build, and scale robust, impactful web applications using both backend and frontend technologies. In this role, you’ll: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 guidanceWork 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.You Should Hit the Apply Button If…

Unfortunately, the instruction requires removal of non-allowed tags. This item remains as plain text for content flow.I Want to Work for a Company That…

Accelerates my growth by giving me tech ownership and autonomy from day oneLets me see my work and high-value impact within monthsProvides direct exposure to executives, not layers of hierarchyValues diversity of thought, background, and approachI’m Looking to Work With…

A team of technical entrepreneurs who think differently and thrive on technical challengeColleagues who share openly, challenge constructively, and grow togetherClients who are ambitious enough to reimagine how data and technology transform their organisationsIn 3–5 Years I Want to Be…

Leading end-to-end technical programmes where my architectural and product designs set benchmarksTrusted by senior stakeholders for both my technical depth and strategic perspectiveDriving innovation in a company that’s scaling fast—not waiting around for slow promotionsPerks and Benefits

£6,000 annual training and conference budget to stay at the cutting edgeUp to 6% matched pension for long-term financial securityComprehensive private healthcare via VitalityEMI share options scheme—own a piece of the growth you help createWork from anywhere in the world for up to 1 month/year25 days holiday + buy/sell up to 5 additional daysCycle-to-work scheme for sustainable commutingCentral London office stocked with refreshments, socials, and vibrant atmosphereExclusive discounts on retail, travel, tech and fitness membershipsAccess to cutting-edge tools, platforms, and regular tech talks and innovation timeEqual Opportunities

We are committed to building a diverse and inclusive team. Different perspectives, identities, and experiences make us stronger—both as people and as a business. All qualified applicants will be considered without regard to sex, sexual orientation, marital status, race, nationality, religion, disability, or age.

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