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Senior Software Engineer (Java)

ARQ - London, United Kingdom - Hybrid - posted 2026-10-05

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ARQ is a fast-growing fintech building infrastructure to move value seamlessly across borders. The company is focused on financial inclusion and transforming how people manage money globally. In this Senior Backend Engineer role, you will design, develop, and maintain scalable, secure, and high-performing backend systems powering ARQ's innovative products. You'll collaborate with a talented team on both greenfield development and improvements to existing systems. Key responsibilities include: - Building REST APIs and engineering microservices - Evolving critical business systems including card payments, treasury management, transactions booking, and crypto liquidity - Writing clean, maintainable code with emphasis on test-driven development (TDD) and domain-driven design (DDD) - Contributing to continuous integration and delivery practices - Working with a pragmatic, results-driven approach to product development The technology stack is predominantly Java 25 on the backend with Postgres databases and Spring Boot for rapid, quality delivery. Requirements: - Demonstrable experience in backend development with fluency in Java - Bachelor's degree or above in Computer Science, Mathematics, Physics, or related Engineering/Science discipline - Quick learner with ambitious, results-driven personality - Excellent communication skills (English fluency, verbal and written) - Track record of building complex products used by millions in hypergrowth startups Workplace: 3-4 days per week in-office in London.

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