Java Software Engineer (City Of London)

Role: Java Software Engineer / Java Developer Location: Central London (EC2M) – hybrid 2 days a week onsite Salary: £40,000-£80,000 Key Skills: Core Java/SE, XML, JSON, Junit, APIs, complex/high-traffic systemsA leading global B2B SaaS technology company is seeking Java Developers at all levels (junior, mid-senior) to join its London-based team. The company operates a large-scale SaaS platform that supports hundreds of millions of daily transactions, supplying content to major travel agencies, meta search engines, and ecommerce platforms.You will join a dynamic development team, working on mission-critical systems, backend API development, and integrations with supplier systems. This includes managing high-volume XML integrations, time-sensitive bug fixes, and contributing to innovative new features and products.Key Responsibilities:Develop and maintain robust backend systems in Java (Java 17).Work on complex system integrations with third-party suppliers and distributors.Handle XML feeds, web scraping, and high-frequency search processing.Deliver timely fixes for critical production issues.Collaborate on product design and contribute to new functionality.Work both independently and in agile teams with shifting priorities.Required Skills and Experience:Strong Java SDK / J2SE programming knowledge.Solid grasp of algorithms, data structures, and object-oriented design patterns.Proactive attitude and ability to take ownership of projects.Experience working on complex / high-traffic systems.Desirable Skills:Degree in Computer Science, Mathematics, or related STEM discipline.Database proficiency (SQL, schema design, JDBC).Understanding of network and web technologies (HTTP, HTML, XML).Familiarity with JavaScript and Node.js is advantageous.Ability to write clean, well-documented code and technical documentation.Benefits:Annual performance bonus and salary review.Flexible working hours (core hours 10:00–16:00).Hybrid work model with 2 office days (Tuesday & Thursday, lunch provided).25 days holiday (rising to 28) + public holidays + option of 25 unpaid days.Private healthcare (after 3 months) and life insurance.Pension scheme with rising employer contribution.Work from anywhere for 4 weeks per year (after one year of service).