76 to 100 of 156 Performance Optimisation Jobs in the City of London

have managed complex, Global products. Read on for more details Experience required: Technical proficiency:Familiarity with Azure services (e.g., Data Lake, Synapse, Fabric) and Databricks for data engineering, analytics, performance optimisation, and governance. Experience with implementing and optimising scalable cloud infrastructure is highly valued. Backlog management:Demonstrated expertise in maintaining and prioritizing product backlogs, writing detailed user stories More ❯

perfect user experiences across iOS and Android devices Collaborate closely with design and backend teams to bring new features to life Take ownership of the full development lifecycle — from performance optimisation to app store deployment What we’re looking for: Strong commercial experience with React Native Proven track record shipping cross-platform apps (iOS + Android) Solid grasp … of mobile lifecycles, performance tuning, and deployments A passion for creating slick user experiences that delight customers Dabbled in Swift/Objective-C (iOS) or Kotlin/Java (Android) Thrived in product-driven, fast-paced environments What’s on offer: 🌍 100% remote flexibility — work from anywhere 💸 Up to £105k salary 🚤 The chance to work on luxury tech with global More ❯

has a significant backlog of products to onboard , so they are looking for a developer who can deliver immediate impact — coding, configuring, and optimising Endur to ensure scalability and performance when upgrading them from version 18 to 25. As a C# Developer focusing on Endur, you’ll work closely with business users, analysts, and other technologists to deliver solutions … Experience Required: 7+ years of hands-on C# development, specifically in .Net Core. Exposure to working on OpenComponents or AVS is a bonus but not necessary. Strong experience with performance optimisation and good logic within C#. Previous experience in ETRM development , ideally across physical commodities , ideally gas and power. Experience working in hybrid BA/Dev teams delivering More ❯

will drive their front end solution and will have 5-8 years experience working as Front End Engineer. This will be developing UI components in Typescript, working on web performance optimisation, ensuring code quality through unit testing. Experience integrating frontend components with Headless CMS. The role is hybrid with 2-3 working days in their central London office. More ❯

will drive their front end solution and will have 5-8 years experience working as Front End Engineer. This will be developing UI components in Typescript, working on web performance optimisation, ensuring code quality through unit testing. Experience integrating frontend components with Headless CMS. The role is hybrid with 2-3 working days in their central London office. More ❯

in-memory data management, data structures, and optimization techniques Understanding of NUMA architecture and NUMA-aware programming Proven track record developing client/server applications Skilled in troubleshooting and performance optimization Working knowledge of financial instruments including Fixed Income, Money Markets, and Derivatives Experience with kernel bypass network drivers (e.g., Solarflare) Technology Stack Linux Red Hat gcc and SunPro More ❯

in-memory data management, data structures, and optimization techniques Understanding of NUMA architecture and NUMA-aware programming Proven track record developing client/server applications Skilled in troubleshooting and performance optimization Working knowledge of financial instruments including Fixed Income, Money Markets, and Derivatives Experience with kernel bypass network drivers (e.g., Solarflare) Technology Stack Linux Red Hat gcc and SunPro More ❯

experience) London Our Client An established UK communications infrastructure provider is looking for a Design Engineer specialising in IP networking, Ethernet, and Wi-Fi systems. Known for delivering high-performance solutions in complex, large-scale environments, the company works across sectors to design, install, and commission advanced connectivity systems. Their approach combines technical precision, robust engineering practices, and a … focus on long-term reliability, enabling them to deliver projects that meet demanding performance and security standards. The Role The Design Engineer will be responsible for developing detailed technical designs, specifications, schedules, CAD drawings, and documentation for IP networking and wireless communication systems. The role covers the full lifecycle from site survey to commissioning, ensuring network infrastructure meets capacity … availability, and security requirements. Key responsibilities include network modelling, capacity planning, performance optimisation, and overseeing commissioning activities. The successful candidate will work closely with internal teams and external partners to deliver innovative, fit-for-purpose networking solutions for high-profile projects. The ideal candidate will have a strong track record in IP network design and delivery, with experience More ❯

12+ years of experience. - Lead the development, testing, and maintenance of low-latency Java applications. - Collaborate with cross-functional teams to gather requirements and design system architecture. - Optimize application performance and troubleshoot latency issues. - Mentor junior developers and ensure adherence to best coding practices. - Participate in code reviews and provide constructive feedback. - Stay updated with the latest industry trends … Bachelor's degree in Computer Science, Engineering, or a related field. - Proven experience in Java development, with a focus on low-latency systems. - Strong understanding of multithreading, concurrency, and performance optimization. - Experience with frameworks and libraries such as Spring, Hibernate, and Netty. - Familiarity with distributed systems and network protocols. - Excellent problem-solving skills and attention to detail. - Effective communication More ❯

12+ years of experience. - Lead the development, testing, and maintenance of low-latency Java applications. - Collaborate with cross-functional teams to gather requirements and design system architecture. - Optimize application performance and troubleshoot latency issues. - Mentor junior developers and ensure adherence to best coding practices. - Participate in code reviews and provide constructive feedback. - Stay updated with the latest industry trends … Bachelor's degree in Computer Science, Engineering, or a related field. - Proven experience in Java development, with a focus on low-latency systems. - Strong understanding of multithreading, concurrency, and performance optimization. - Experience with frameworks and libraries such as Spring, Hibernate, and Netty. - Familiarity with distributed systems and network protocols. - Excellent problem-solving skills and attention to detail. - Effective communication More ❯

z/OS Systems Programmer (Mainframe) - Fully Remote We are looking for an experienced z/OS Systems Programmer to join our team, supporting the migration, installation, maintenance, and performance optimisation of IBM z/OS environments. This role is critical to ensuring reliability, security, and efficiency across our Mainframe infrastructure, while contributing to modernisation and compliance initiatives. … Responsibilities Install, configure, and maintain z/OS, JES2, SMP/E, and RACF Manage system patches, upgrades, and performance tuning Troubleshoot and resolve complex Mainframe systems issues Support integrations, migrations, and deployments across the platform Ensure adherence to security policies and regulatory compliance Collaborate with technical teams to deliver efficient and secure solutions Key Skills & Experience Strong experience More ❯

z/OS Systems Programmer (Mainframe) - Fully Remote We are looking for an experienced z/OS Systems Programmer to join our team, supporting the migration, installation, maintenance, and performance optimisation of IBM z/OS environments. This role is critical to ensuring reliability, security, and efficiency across our Mainframe infrastructure, while contributing to modernisation and compliance initiatives. … Responsibilities Install, configure, and maintain z/OS, JES2, SMP/E, and RACF Manage system patches, upgrades, and performance tuning Troubleshoot and resolve complex Mainframe systems issues Support integrations, migrations, and deployments across the platform Ensure adherence to security policies and regulatory compliance Collaborate with technical teams to deliver efficient and secure solutions Key Skills & Experience Strong experience More ❯

on role in a dynamic, fast-paced environment, ideal for someone who enjoys solving complex problems and working collaboratively with engineering and product teams. Key Responsibilities Build scalable, high-performance features for a modern SaaS platform Optimize existing systems for speed, usability, and reliability Lead technical decisions and mentor junior engineers Collaborate closely with cross-functional teams to deliver … CD Requirements 4–7+ years’ experience in full-stack web development Proven track record delivering high-quality SaaS products at scale Strong understanding of UI/UX principles and performance optimization Excellent communication, problem-solving, and leadership skills Passion for writing clean, maintainable, and scalable code Bonus: Experience in financial technology or asset management software. Salary £85k - £95k + More ❯

on role in a dynamic, fast-paced environment, ideal for someone who enjoys solving complex problems and working collaboratively with engineering and product teams. Key Responsibilities Build scalable, high-performance features for a modern SaaS platform Optimize existing systems for speed, usability, and reliability Lead technical decisions and mentor junior engineers Collaborate closely with cross-functional teams to deliver … CD Requirements 4–7+ years’ experience in full-stack web development Proven track record delivering high-quality SaaS products at scale Strong understanding of UI/UX principles and performance optimization Excellent communication, problem-solving, and leadership skills Passion for writing clean, maintainable, and scalable code Bonus: Experience in financial technology or asset management software. Salary £85k - £95k + More ❯

Engineer with Apigee knowledge to bridge the gap between development and operations, focusing on automating workflows, optimizing CI/CD pipelines, and ensuring reliable software deployment. Manage infrastructure, monitor performance, and collaborate across teams to maintain scalable, secure, and resilient systems. Key role and responsibilities Build, deploy, and monitor solutions using AWS services (Lambda, API Gateway, CloudWatch, ECS, ECR … generate custom analytics reports for API consumption and errors Implementation of API security and access control (OAuth, API keys, JWT, etc.) Familiarity with API design patterns, best practices, and performance optimization Excellent collaboration and communication skills Randstad Technologies Ltd is a leading specialist recruitment business for the IT & Engineering industries. Please note that due to a high level of More ❯

availability systems. Raise engineering quality: Champion best practices for testing, observability, and security. Review critical PRs and guide technical decisions across the team. Operate and improve production systems: Monitor performance, reliability, and cost efficiency. Lead incident response and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. … experience designing and delivering production systems using Python on AWS . Strong understanding of distributed systems, API design, and event-driven architectures. Deep knowledge of system observability, logging, and performance optimisation. Familiarity with modern security and data-privacy best practices. Excellent communicator who can document and articulate technical trade-offs clearly. Behaviours & Attributes Ownership: Takes full responsibility for systems More ❯

availability systems. Raise engineering quality: Champion best practices for testing, observability, and security. Review critical PRs and guide technical decisions across the team. Operate and improve production systems: Monitor performance, reliability, and cost efficiency. Lead incident response and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. … experience designing and delivering production systems using Python on AWS . Strong understanding of distributed systems, API design, and event-driven architectures. Deep knowledge of system observability, logging, and performance optimisation. Familiarity with modern security and data-privacy best practices. Excellent communicator who can document and articulate technical trade-offs clearly. Behaviours & Attributes Ownership: Takes full responsibility for systems More ❯

availability systems. Raise engineering quality: Champion best practices for testing, observability, and security. Review critical PRs and guide technical decisions across the team. Operate and improve production systems: Monitor performance, reliability, and cost efficiency. Lead incident response and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. … experience designing and delivering production systems using Python on AWS . Strong understanding of distributed systems, API design, and event-driven architectures. Deep knowledge of system observability, logging, and performance optimisation. Familiarity with modern security and data-privacy best practices. Excellent communicator who can document and articulate technical trade-offs clearly. Behaviours & Attributes Ownership: Takes full responsibility for systems More ❯

availability systems. Raise engineering quality: Champion best practices for testing, observability, and security. Review critical PRs and guide technical decisions across the team. Operate and improve production systems: Monitor performance, reliability, and cost efficiency. Lead incident response and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. … experience designing and delivering production systems using Python on AWS . Strong understanding of distributed systems, API design, and event-driven architectures. Deep knowledge of system observability, logging, and performance optimisation. Familiarity with modern security and data-privacy best practices. Excellent communicator who can document and articulate technical trade-offs clearly. Behaviours & Attributes Ownership: Takes full responsibility for systems More ❯

maintain highly available, scalable, and secure infrastructure on Google Cloud Platform (GCP) using Anthos, Terraform, Kubernetes, ISTIO, and ArgoCD. Architect and manage Kubernetes multi-region deployments to ensure optimal performance and reliability across geographical regions. Implement event-driven autoscaling using KEDA and Knative for efficient resource utilization and cost optimization. Streamline build and deployment processes using Maven, Gradle, Jenkins … to achieve continuous integration and continuous delivery (CI/CD). Set up robust tracing and observability tools, such as Stackdriver, Prometheus, Grafana, and Jaeger, to monitor system health, performance, and reliability. Collaborate closely with cross-functional teams including development, QA, and operations to troubleshoot issues, optimize workflows, and improve system reliability. Stay current with industry trends and best … role with a strong background in system administration. In-depth knowledge of Kubernetes, with specific experience in managing Anthos environments. Extensive experience with Linux OS, including administration, troubleshooting, and performance optimization. Proficiency in at least one cloud platform (GCP preferred, with AWS or Azure also acceptable). Familiarity with infrastructure-as-code tools (e.g., Terraform, Ansible) and CI/ More ❯

maintain highly available, scalable, and secure infrastructure on Google Cloud Platform (GCP) using Anthos, Terraform, Kubernetes, ISTIO, and ArgoCD. Architect and manage Kubernetes multi-region deployments to ensure optimal performance and reliability across geographical regions. Implement event-driven autoscaling using KEDA and Knative for efficient resource utilization and cost optimization. Streamline build and deployment processes using Maven, Gradle, Jenkins … to achieve continuous integration and continuous delivery (CI/CD). Set up robust tracing and observability tools, such as Stackdriver, Prometheus, Grafana, and Jaeger, to monitor system health, performance, and reliability. Collaborate closely with cross-functional teams including development, QA, and operations to troubleshoot issues, optimize workflows, and improve system reliability. Stay current with industry trends and best … role with a strong background in system administration. In-depth knowledge of Kubernetes, with specific experience in managing Anthos environments. Extensive experience with Linux OS, including administration, troubleshooting, and performance optimization. Proficiency in at least one cloud platform (GCP preferred, with AWS or Azure also acceptable). Familiarity with infrastructure-as-code tools (e.g., Terraform, Ansible) and CI/ More ❯

using Apigee Edge and X-API strategy. Perform API strategy execution, provide technical support, and generate insights through analytical reports. Manage infrastructure automation, monitoring, and optimization to ensure high performance and reliability. Collaborate with cross-functional teams to improve system efficiency, scalability, and deployment automation. Troubleshoot and resolve system and integration issues promptly. Maintain clear documentation for builds, deployments … custom analytical reports for API consumption and error tracking. Familiarity with API security and access control mechanisms (OAuth, API keys, JWT, etc.). Proficient in API design best practices, performance optimization, and monitoring techniques. More ❯

using Apigee Edge and X-API strategy. Perform API strategy execution, provide technical support, and generate insights through analytical reports. Manage infrastructure automation, monitoring, and optimization to ensure high performance and reliability. Collaborate with cross-functional teams to improve system efficiency, scalability, and deployment automation. Troubleshoot and resolve system and integration issues promptly. Maintain clear documentation for builds, deployments … custom analytical reports for API consumption and error tracking. Familiarity with API security and access control mechanisms (OAuth, API keys, JWT, etc.). Proficient in API design best practices, performance optimization, and monitoring techniques. More ❯

and maintain data visualization solutions that transform raw data into actionable insights. Your work enables business stakeholders to make informed decisions through intuitive dashboards and reports that reflect key performance metrics. Key Responsibilities: Requirement Gathering: Collaborate with business and data teams to understand reporting needs and translate them into technical specifications. Data Integration & Modeling: Design efficient data models and … perform ETL from various sources to ensure data accuracy and performance. Dashboard Development: Build interactive, user-friendly dashboards and reports using Qlik Sense scripting and visualization tools. Performance Optimization: Enhance application performance through script optimization and efficient data modeling. Testing & QA: Conduct rigorous testing and support user acceptance to ensure data accuracy and functional alignment. Documentation & Training: Document … Qlik’s scripting language for custom data loading, transformation, and calculations. •Data Analysis and Visualization: Skills in visualizing data, selecting appropriate chart types, and creating user-friendly, interactive dashboards. •Performance Optimization: Understanding of Qlik performance tuning, data model optimization, and dashboard load balancing. •Problem-Solving and Critical Thinking: Ability to analyze and troubleshoot data issues, application errors, and More ❯

and maintain data visualization solutions that transform raw data into actionable insights. Your work enables business stakeholders to make informed decisions through intuitive dashboards and reports that reflect key performance metrics. Key Responsibilities: Requirement Gathering: Collaborate with business and data teams to understand reporting needs and translate them into technical specifications. Data Integration & Modeling: Design efficient data models and … perform ETL from various sources to ensure data accuracy and performance. Dashboard Development: Build interactive, user-friendly dashboards and reports using Qlik Sense scripting and visualization tools. Performance Optimization: Enhance application performance through script optimization and efficient data modeling. Testing & QA: Conduct rigorous testing and support user acceptance to ensure data accuracy and functional alignment. Documentation & Training: Document … Qlik’s scripting language for custom data loading, transformation, and calculations. •Data Analysis and Visualization: Skills in visualizing data, selecting appropriate chart types, and creating user-friendly, interactive dashboards. •Performance Optimization: Understanding of Qlik performance tuning, data model optimization, and dashboard load balancing. •Problem-Solving and Critical Thinking: Ability to analyze and troubleshoot data issues, application errors, and More ❯