LocationSheffield, UK, United Kingdom# Full stack Developer at N Consulting LtdLocationSheffield, UK, United KingdomSalary£400 - £500 /dayJob TypeContractDate PostedFebruary 16th, 2026Apply NowJob Title: Senior API Engineer / Backend Architect – Payments Modernization Location: UK (Hybrid – 2–3 days onsite) Employment Type: Contract / Permanent Industry: Banking & Financial ServicesKey ResponsibilitiesDeliver engineering expertise to build best-in-class payment processing capabilitiesDesign and develop high-quality, resilient, and highly available microservicesProduce architectural artefacts including gap analysis, low-level designs, and data modelsLead by example in coding standards, quality gates, and automated testingSupport modernization of legacy payment systems into cloud-based architecturesResolve architectural and development blockersCollaborate with DevOps to enable CI/CD, DevSecOps, and automated infrastructure deliveryProvide architecture guidance aligned with global standards and compliance requirementsEnsure systems meet security, data privacy, and regulatory standardsRequired Skills & Experience8+ years of experience as an API/Backend EngineerStrong expertise in Java (8+ years), Spring Boot, and distributed microservices architectureExperience with Kafka, Docker, Kubernetes (k8s), and service mesh technologiesStrong understanding of distributed system design and event-driven architectureJVM tuning and performance optimization expertiseExperience with monitoring/observability tools: Splunk, Grafana, Prometheus, Jaeger, OpenTelemetryCloud & DevOps experience (AWS/Azure/GCP), including VPC, IAM, firewall configurationStrong SQL skills and database design experienceExperience working in financial services, ideally paymentsStrong leadership, mentoring, and stakeholder communication skillsNice to HaveExperience with Go or RustExperience in payment systems (ISO20022, SWIFT, clearing, settlement platforms)Experience with Kubernetes networking (CNI), load balancing, Linux infrastructure
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