{"id":3983686,"url":"https://alion.io/job/cognizant-java-senior-developer-core-services","title":"Java Senior Developer - Core Services","company":{"id":85,"name":"Cognizant","domain":"cognizant.com","url":"https://alion.io/company/cognizant","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Cognizant Careers","truth_index":{"grade":"A","score":87,"open_postings":178,"ghost_share":0,"stale_share":0.489,"repost_share":0.056,"time_to_fill_p50_days":23,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"AI Agents","optional":false},{"name":"Amazon SageMaker","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"Bash","optional":false},{"name":"Cassandra","optional":false},{"name":"CI/CD","optional":false},{"name":"Datadog","optional":false},{"name":"Docker","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Grafana","optional":false},{"name":"Java","optional":false},{"name":"Kubernetes","optional":false},{"name":"Linux","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Prometheus","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Framework","optional":false},{"name":"Unix","optional":false}],"status":"live","first_seen_at":"2026-11-09T12:30:04Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-09T20:50:30Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Java Senior Developer - Core Services\nLocation: London, UK\nEmployment Type: Full-time\nWork Model: Hybrid\nAbout the Role\nThe Senior Developer, Core Services role is focused on building and supporting highly scalable backend systems for live and Video on Demand streaming services. The developer will work primarily with Java and Spring, developing end-user applications and scalable APIs while contributing to technical direction, architecture/design decisions, production support, system reliability, and continuous improvement.\nThe role also requires ownership of functional and non-functional quality, particularly security, resiliency, and performance, along with strong collaboration across development, architecture, and other teams.\nIn this role, you will:\nDevelop and maintain components using Java and Spring, covering new features, fixes, enhancements, and existing functionality.\nBuild well-tested, robust and reliable code, including handling edge cases and usability considerations\nIdentify production/code issues and use appropriate debugging techniques and tools for resolution.\nSupport non-functional testing, including performance, resiliency, and security considerations.\nMaintain and support AWS infrastructure, Kubernetes deployments, AWS Keyspaces, Redis and Kafka.\nReview peer code and ensure adherence to coding standards and engineering best practices.\nPropose technical solutions and make design decisions for complex, scalable systems.\nCollaborate with developers, architects, and analysts to understand requirements and deliver solutions.\nParticipate in stand-ups and other Agile/team ceremonies and contribute to continuous improvement.\nWhat You Need to Have to Be Considered\nThe ideal candidate will have strong experience in backend software engineering and cloud-native application development, with expertise in the following areas:\nStrong hands-on experience in Java and Spring Framework development.\nProven experience building web applications and RESTful APIs.\nSolid understanding of event-driven architectures, including Kafka, asynchronous messaging, and distributed systems.\nExperience working with AWS and AWS-native cloud services.\nStrong knowledge of database and persistence technologies such as Cassandra/AWS Keyspaces, Redis, and PostgreSQL/DSQL.\nExperience with containerization and orchestration technologies, including Docker and Kubernetes.\nHands-on experience with CI/CD pipelines, particularly using GitHub Actions and modern software delivery practices.\nExperience with automated testing frameworks and a good understanding of non-functional requirements such as performance, scalability, security, and reliability.\nProficiency with Unix/Linux environments and Bash scripting.\nExperience designing and implementing scalable, resilient software solutions.\nStrong engineering fundamentals, including debugging, code reviews, system reliability, and software development best practices.\nAdditional eligibility requirements:\n· Candidates must currently reside in the UK.\n· Candidates must be available to start within 4 weeks of receiving an offer.\nThese Will Help You Stand Out\nObservability: Datadog, Prometheus and Grafana.\nAI/ML technologies: SageMaker, Azure and Gemini LLMs.\nConfidence with AI-assisted / agentic software development.\nBroader understanding of relevant technologies and modern software architecture.\nStrong cross-team collaboration and communication skills.\nSelf-driven attitude with an interest in continuously learning new technologies, frameworks and engineering practices.\nCreative thinking, analytical ability and attention to detail.","description_format":"text","description_chars":3607,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","IT Outsourcing & Dedicated Teams","Engineering Services","Cloud Consulting & 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