126 to 150 of 156 Performance Tuning Jobs in the City of London

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 ❯

review, implementation and optimisation for Cloud solutions. As an extension of our client’s IT team, you will be a valued member of the accounts team, ensuring the operation performance and suitability of the solutions we provide. This role is an internal authority in these areas, and as a voice of the customer, looked upon to provide technical leadership … an ability to command and influence from engineering to C-Level engagements. Ideally you will have extensive experience working on Virtualization VMWare and Cloud , Azure platform – configuration, build and performance tuning as well as experience of architecting and managing production environments across Physical, Virtualized and Cloud technologies, What Makes Us Great Six Degrees has been honoured as an More ❯

review, implementation and optimisation for Cloud solutions. As an extension of our client’s IT team, you will be a valued member of the accounts team, ensuring the operation performance and suitability of the solutions we provide. This role is an internal authority in these areas, and as a voice of the customer, looked upon to provide technical leadership … an ability to command and influence from engineering to C-Level engagements. Ideally you will have extensive experience working on Virtualization VMWare and Cloud , Azure platform – configuration, build and performance tuning as well as experience of architecting and managing production environments across Physical, Virtualized and Cloud technologies, What Makes Us Great Six Degrees has been honoured as an 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 ❯

FPGA ENGINEER – ULTRA-LOW LATENCY SYSTEMS Location: London (Hybrid: 4 days onsite) Sector: Quant Trading/High-Performance Computing Industry leading compensation Quant Capital is partnering with a global trading firm building a greenfield FPGA team focused on low-latency, high-throughput hardware systems. This small, senior group will deliver high-speed compute infrastructure integrated directly into trading, research … We’re Looking For Strong RTL skills with experience building complex, optimised designs Programming skills, C, C++ or similar Solid grasp of timing closure, datapath design, and hardware-level performance tuning Familiar with toolchains (Vivado, Quartus) and debugging workflows Comfortable working close to hardware and owning the full development cycle Interest in improving hardware workflows or applying high More ❯

FPGA ENGINEER – ULTRA-LOW LATENCY SYSTEMS Location: London (Hybrid: 4 days onsite) Sector: Quant Trading/High-Performance Computing Industry leading compensation Quant Capital is partnering with a global trading firm building a greenfield FPGA team focused on low-latency, high-throughput hardware systems. This small, senior group will deliver high-speed compute infrastructure integrated directly into trading, research … We’re Looking For Strong RTL skills with experience building complex, optimised designs Programming skills, C, C++ or similar Solid grasp of timing closure, datapath design, and hardware-level performance tuning Familiar with toolchains (Vivado, Quartus) and debugging workflows Comfortable working close to hardware and owning the full development cycle Interest in improving hardware workflows or applying high More ❯

platform app, built with a clean, scalable architecture and a product that’s already live and growing fast. You’ll be hands-on with everything from UI polish to performance tuning, and you’ll have a strong voice in architectural decisions, tooling, and release strategy. The team is small, sharp, and fully remote. Everyone here codes, cares, and More ❯

The stack includes Riverpod for state management, GraphQL for API communication, and Firebase for auth, analytics, and push. You’ll be hands-on with everything from UI polish to performance tuning, and you’ll have a strong voice in architectural decisions, tooling, and release strategy. The team is small, sharp, and fully remote. Everyone here codes, cares, and More ❯

The 3rd Line Engineer will ensure IT systems are robust and free from security threats and vulnerabilities. The 3rd Line Engineer will foster a culture of first-class system performance tuning and optimisation. The 3rd Line Engineer will be comfortable with networking concepts and protocols. The 3rd Line Engineer will be up-to-date with the latest developments More ❯

The 3rd Line Engineer will ensure IT systems are robust and free from security threats and vulnerabilities. The 3rd Line Engineer will foster a culture of first-class system performance tuning and optimisation. The 3rd Line Engineer will be comfortable with networking concepts and protocols. The 3rd Line Engineer will be up-to-date with the latest developments More ❯

candidate will have a strong background in data architecture, cloud platforms, and modern data integration patterns, with a proven ability to translate business requirements into scalable, secure, and high-performance data solutions. Responsibilities Design and implement end-to-end Snowflake data architecture and data models to support analytical and operational reporting needs. Define best practices for Snowflake usage, data … ingestion, transformation, and performance tuning. Develop and optimize ETL/ELT pipelines using tools such as Snowpipe, dbt, Airflow, Informatica, or Talend . Collaborate with data engineers, BI developers, and data scientists to ensure consistent and efficient data access. Implement data governance, security, and compliance standards (RBAC, masking, encryption, etc.). Work with cloud platforms (AWS, Azure, or GCP … to integrate Snowflake with cloud-native services. Oversee data migration from legacy systems to Snowflake. Conduct performance monitoring and capacity planning for Snowflake workloads. Provide technical leadership and mentor junior engineers on Snowflake best practices. Skillset Design end-to-end Snowflake data architecture, including schema design, data modeling (3NF, star/snowflake, data vault), and ELT frameworks. Define data More ❯

shape and scale the firm’s data platform over the next few years. The ideal candidate will bring strong technical ability, curiosity, and a drive to build robust, high-performance systems. Key Responsibilities Partner with quantitative researchers, developers, and portfolio teams to turn business needs into practical, scalable data solutions. Extend and optimise the data warehouse by integrating new … data sources and improving system performance, scalability, and reliability. Help define best practices for data quality, governance, and platform architecture. Evaluate and implement modern tools and frameworks for managing, querying, and streaming large datasets. Build and maintain automated processes for data validation, anomaly detection, and system monitoring. Support the production environment and ensure smooth data operations. Manage relationships with … ll Need Strong programming skills in Python and solid experience working in Unix/Linux environments. Advanced SQL skills and good knowledge of NoSQL systems (e.g. Postgres, MongoDB), including performance tuning. Understanding of data modelling concepts, including both normalised and denormalised structures. Experience with cloud technologies such as AWS or GCP. Familiarity with version control (Git) and collaborative development More ❯

lake. Data Transformation with Python: Write, optimize, and maintain production-grade Python scripts to clean, transform, aggregate, and process large volumes of data. Database Interaction (SQL): Develop complex, high-performance SQL queries (DDL/DML) for data extraction, manipulation, and validation within relational and data warehousing environments. Quality Assurance: Implement data quality checks and monitoring across pipelines, identifying discrepancies … scripting. Familiarity with standard Python data libraries (e.g., Pandas, NumPy ). Database Expert-level proficiency in SQL (Structured Query Language). Experience writing complex joins, stored procedures, and performing performance tuning. Big Data Concepts Foundational understanding of Big Data architecture (Data Lakes, Data Warehouses) and distributed processing concepts (e.g., MapReduce). ETL/ELT Basic knowledge of ETL principles More ❯

lake. Data Transformation with Python: Write, optimize, and maintain production-grade Python scripts to clean, transform, aggregate, and process large volumes of data. Database Interaction (SQL): Develop complex, high-performance SQL queries (DDL/DML) for data extraction, manipulation, and validation within relational and data warehousing environments. Quality Assurance: Implement data quality checks and monitoring across pipelines, identifying discrepancies … scripting. Familiarity with standard Python data libraries (e.g., Pandas, NumPy ). Database Expert-level proficiency in SQL (Structured Query Language). Experience writing complex joins, stored procedures, and performing performance tuning. Big Data Concepts Foundational understanding of Big Data architecture (Data Lakes, Data Warehouses) and distributed processing concepts (e.g., MapReduce). ETL/ELT Basic knowledge of ETL principles More ❯

the end-to-end delivery of technical projects, from initial design and development through to implementation and documentation, ensuring seamless broadcast transmission. Act as the technical authority for system performance, proactively monitoring, tuning, and troubleshooting complex hardware and software issues to ensure optimal uptime and data integrity. Collaborate effectively across the business, working with engineers, managers, and vendors … e.g., Ansible, Puppet). Solid knowledge of core networking technologies, including the TCP/IP stack, switching, routing, and multicast. Demonstrable experience in system hardening, security best practices, and performance tuning. Exceptional problem-solving abilities and clear communication skills, with a focus on detail and the ability to perform under pressure. Salary : Up to £80,000 Per Annum More ❯

the end-to-end delivery of technical projects, from initial design and development through to implementation and documentation, ensuring seamless broadcast transmission. Act as the technical authority for system performance, proactively monitoring, tuning, and troubleshooting complex hardware and software issues to ensure optimal uptime and data integrity. Collaborate effectively across the business, working with engineers, managers, and vendors … e.g., Ansible, Puppet). Solid knowledge of core networking technologies, including the TCP/IP stack, switching, routing, and multicast. Demonstrable experience in system hardening, security best practices, and performance tuning. Exceptional problem-solving abilities and clear communication skills, with a focus on detail and the ability to perform under pressure. Salary : Up to £80,000 Per Annum More ❯

operates at the intersection of blockchain, algorithmic and automated trading, and distributed systems, and is seeking a Lead Systems Engineer to architect and scale the infrastructure behind their high-performance Crypto operations. Role Overview As Lead Systems Engineer, you’ll take ownership of the systems that power real-time, on-chain trading strategies. You’ll work across bare metal … for blockchain-integrated services. Build and maintain infrastructure for running blockchain nodes, RPC endpoints, and trading bots. Automate deployment and monitoring using Python and Golang. Ensure high availability and performance of systems interacting with DeFi protocols. Collaborate with smart contract developers, quant researchers, and trading engineers. Skills 8+ years' experience as a System Engineer/Platform Engineer 5+ years … experience in Linux system administration and performance tuning. Strong experience with configuration management tools (e.g., Terraform, Ansible). Proven track record in CI/CD pipeline design, especially for distributed systems. Experience with cloud platforms (AWS, GCP, or Azure). Proficiency in Python and Golang for automation and tooling. Familiarity with blockchain infrastructure, including Ethereum, Solana, or Layer More ❯

operates at the intersection of blockchain, algorithmic and automated trading, and distributed systems, and is seeking a Lead Systems Engineer to architect and scale the infrastructure behind their high-performance Crypto operations. Role Overview As Lead Systems Engineer, you’ll take ownership of the systems that power real-time, on-chain trading strategies. You’ll work across bare metal … for blockchain-integrated services. Build and maintain infrastructure for running blockchain nodes, RPC endpoints, and trading bots. Automate deployment and monitoring using Python and Golang. Ensure high availability and performance of systems interacting with DeFi protocols. Collaborate with smart contract developers, quant researchers, and trading engineers. Skills 8+ years' experience as a System Engineer/Platform Engineer 5+ years … experience in Linux system administration and performance tuning. Strong experience with configuration management tools (e.g., Terraform, Ansible). Proven track record in CI/CD pipeline design, especially for distributed systems. Experience with cloud platforms (AWS, GCP, or Azure). Proficiency in Python and Golang for automation and tooling. Familiarity with blockchain infrastructure, including Ethereum, Solana, or Layer More ❯

firm in their search for an experienced KDB+ Engineer to join their growing data and analytics engineering team. This is a hands-on development role focused on building high-performance data systems and real-time analytics that power decision-making across trading and management teams. Key Responsibilities Design, enhance, and maintain analytics platforms that deliver transparency and actionable insights … frameworks supporting real-time dashboards, execution analytics, and market microstructure research. Design complex event processing systems to detect data anomalies and generate real-time trading signals. Continuously improve system performance, robustness, and scalability while managing cost and operational efficiency. Collaborate closely with quants, traders, and technology teams to deliver reliable, low-latency data solutions. Required Skills & Experience Expert proficiency … with experience in large-scale data and analytics systems. Strong programming background in Python and/or Java. Solid understanding of Linux systems engineering, including networking and kernel-level performance tuning. Experience working with market data. Familiarity with low-latency and high-frequency trading environments would be a plus. Exposure to AWS and cloud-based KDB+ deployments, with practical More ❯

firm in their search for an experienced KDB+ Engineer to join their growing data and analytics engineering team. This is a hands-on development role focused on building high-performance data systems and real-time analytics that power decision-making across trading and management teams. Key Responsibilities Design, enhance, and maintain analytics platforms that deliver transparency and actionable insights … frameworks supporting real-time dashboards, execution analytics, and market microstructure research. Design complex event processing systems to detect data anomalies and generate real-time trading signals. Continuously improve system performance, robustness, and scalability while managing cost and operational efficiency. Collaborate closely with quants, traders, and technology teams to deliver reliable, low-latency data solutions. Required Skills & Experience Expert proficiency … with experience in large-scale data and analytics systems. Strong programming background in Python and/or Java. Solid understanding of Linux systems engineering, including networking and kernel-level performance tuning. Experience working with market data. Familiarity with low-latency and high-frequency trading environments would be a plus. Exposure to AWS and cloud-based KDB+ deployments, with practical More ❯

you sweat details and outcomes. AI-native builder : Cursor, v0 , Claude Code (and friends) are daily drivers for rapid prototyping and refactors. React + TypeScript mastery: component design, hooks, performance, testing (Vitest/Jest, Playwright). FastAPI expertise: async patterns, Pydantic schemas, pagination, auth (OAuth2/OIDC), rate-limits, background jobs. Elasticsearch fluency: mappings/analyzers (ngrams, synonyms), aggregations … filters, sorting, performance tuning. Cloud & DevOps : solid experience on AWS and/or GCP , Docker, Terraform, GitHub Actions, monitoring/alerts. Datastores : Postgres (SQL, migrations), Redis (caching/queues). Quality & security : code reviews, type safety, lint/format, secrets mgmt, least-privilege IAM, basic SOC2 hygiene. Communicates clearly with product sense; ships value weekly. About Clarity Anecdote is More ❯

in Azure and C#/.NET is required by a global, prestigious luxury brand. This is a hands-on leadership role where you will translate architectural vision into high-performance, enterprise-grade solutions. Working closely with the Global Head of Engineering and a talented global team of developers and architects, you will plan, design, and deliver scalable, secure, and … cloud platforms within Microsoft Azure. The organisation has beautiful offices in the West End, with a requirement to attend approximately once a fortnight. Key Responsibilities: Design and deliver high-performance, public-facing REST APIs and system integrations within a modern Azure environment. Produce API documentation that adheres to OpenAPI 3.x standards. Lead and mentor a small, focused development team … Auth0, and WebSockets. Proven ability to design APIs from the ground up that follow REST principles and OpenAPI 3.x standards. Hands-on experience with Azure DevOps pipelines, automation, and performance tuning. A mindset focused on continuous improvement, security-first design, and delivery excellence. Degree in Computer Science or equivalent experience. Azure certifications are advantageous. Why Apply? This is an More ❯

HK A leading buy-side firm is seeking a C++ Low Latency Developer to join its fast-paced trading environment. The ideal candidate will have strong experience developing high-performance systems within financial markets and a passion for optimization and low-level engineering. Key Responsibilities Design, develop, and optimize low-latency C++ systems for trading applications. Collaborate with quantitative … and infrastructure teams to improve performance and stability. Contribute to system architecture and scalability across global trading platforms. Maintain high coding standards, ensuring reliability and speed in production systems. Requirements 3+ years of professional experience in C++ development. Proven background in low-latency systems within financial services. Deep understanding of data structures, algorithms, and performance tuning. Experience in More ❯

HK A leading buy-side firm is seeking a C++ Low Latency Developer to join its fast-paced trading environment. The ideal candidate will have strong experience developing high-performance systems within financial markets and a passion for optimization and low-level engineering. Key Responsibilities Design, develop, and optimize low-latency C++ systems for trading applications. Collaborate with quantitative … and infrastructure teams to improve performance and stability. Contribute to system architecture and scalability across global trading platforms. Maintain high coding standards, ensuring reliability and speed in production systems. Requirements 3+ years of professional experience in C++ development. Proven background in low-latency systems within financial services. Deep understanding of data structures, algorithms, and performance tuning. Experience in More ❯

and operations teams, taking full responsibility for the organisation’s core technology services—including infrastructure, digital workplace, and IT security. You will ensure the secure design, management, maintenance, and performance of key systems such as networks, datacentres, cloud platforms, servers, and end-user devices. Working closely with business and IT leadership, you will define and deliver the strategic roadmap … What are the day-to-day tasks? Strategies and Operational control : Develops strategies for managing the cloud infrastructure, Digital Workplace and Security Operations, providing technical leadership to optimise the performance and cost base of the services Monitoring and reporting : Ensures that operational issues are identified, recorded, monitored and resolved. Provides appropriate status and other reports to specialists, users and … and processes (including automation) for the management of systems and services. Problem Management: Conducts investigations of significant operational outage and provides recommendations for problem mitigation. Initiates reviews of infrastructure performance to surface & resolve problems and build infrastructure resilience. Service levels: Ensures that the Cloud infrastructure, Digital Workplace and Security operations team meet Service or Operational Level Agreements. Reports and More ❯