Top Tech Jobs & Startup Jobs in London

Build and scale high-performance iOS experiences using Swift and modern frameworks. Own features from concept through launch, contribute to app architecture, write maintainable code, improve performance and reliability, and collaborate with Product, Design, and Backend teams. Participate in code reviews and raise engineering standards while delivering polished user experiences for fintech products.

Design, develop, and maintain scalable backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work primarily with Java, PostgreSQL, and Spring Boot while applying clean code, TDD, DDD, and CI/CD practices. Collaborate with a high-performing team on greenfield development and improvements to systems used by millions of people.

Design, develop, and maintain scalable backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work primarily with Java, PostgreSQL, and Spring Boot while applying clean code, TDD, DDD, and CI/CD practices. Collaborate with a high-performing team on greenfield development and improvements to systems used by millions of people.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work on greenfield and existing systems using Java, Spring Boot, PostgreSQL, TDD, DDD, and CI/CD, while collaborating with a high-performing team to deliver maintainable software.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work primarily with Java, PostgreSQL, and Spring Boot while applying clean code, TDD, DDD, and CI/CD practices. Collaborate with a high-performing team to deliver greenfield and existing-system improvements.

The Growth Analytics Lead will analyze growth data, define KPIs, conduct complex analyses, and support strategic recommendations for business performance.

Work directly with founders to lead cross-functional, revenue-driving initiatives: launch monetization streams, design activation and cross-sell programs, execute local growth (community, affiliates, influencers), negotiate commercial terms, and track P&L impact of projects to improve revenue, margins, and operating costs.

Design, build, and deploy machine learning models to detect fraud, prevent losses, and monitor risk. Work with Product, Engineering, and Operations to turn large-scale data into production-ready pipelines and model-serving solutions, monitor performance, and continuously improve model accuracy and business impact.

The Talent Acquisition Specialist will lead hiring efforts, build a talent team, and implement scalable recruitment programs to drive growth at ARQ. Responsibilities include sourcing candidates, managing hiring KPIs, and ensuring an exceptional candidate experience.

Lead growth-focused data science initiatives, owning LTV prediction models across countries and channels. Translate business questions into models, analyze large customer and marketing datasets, evaluate acquisition quality, monitor and productionise models with engineering partners, and drive data-informed growth and retention decisions.