18 of 18 High Availability Jobs in the City of London

C#.Net Developer

Hiring Organisation
Boston Hale
Location
City of London, London, England, United Kingdom
Employment Type
Contractor
Contract Rate
£450 - £550 per day
days onsite/2 days remote) I'm partnering with a leading multinational investment management firm seeking a strong C# Developer to join a high-performing engineering team delivering business-critical platforms. This role requires someone confident with strong communication skills to engage directly with stakeholders, shaping requirements … working on: Real-time asset tracking platforms integrating external data sources (e.g. Bloomberg, Refinitiv, Morningstar, market data feeds, pricing & risk engines) High-availability, high-quality distributed applications Enhancing systems that model financial positions, transactions and flows Driving projects from inception through design, build, testing and release Core ...

Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK)

Hiring Organisation
Transreport
Location
City of London, Greater London, UK
deployment practices, monitoring, and long-term maintainability. Operational Accountability: Act as the technical owner of production systems that directly impact live rail operations, ensuring high availability and rapid incident resolution. Requirements Must Haves 4+ years of professional experience with Ruby on Rails. Strong understanding of object-oriented programming … your family Culture & Operating Principles We value : Ownership over hierarchy Clarity over bureaucracy Impact over job titles We operate with high autonomy and high accountability. People are expected to raise risks early, communicate clearly, and take responsibility for outcomes. Interview Roadmap Screening Call (30 mins) – Recruiter alignment Technical ...

Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK)

Hiring Organisation
Transreport
Location
City of London, London, United Kingdom
deployment practices, monitoring, and long-term maintainability. Operational Accountability: Act as the technical owner of production systems that directly impact live rail operations, ensuring high availability and rapid incident resolution. Requirements Must Haves 4+ years of professional experience with Ruby on Rails. Strong understanding of object-oriented programming … your family Culture & Operating Principles We value : Ownership over hierarchy Clarity over bureaucracy Impact over job titles We operate with high autonomy and high accountability. People are expected to raise risks early, communicate clearly, and take responsibility for outcomes. Interview Roadmap Screening Call (30 mins) – Recruiter alignment Technical ...

Back End Developer

Hiring Organisation
TRIA
Location
City of London, Greater London, UK
pipelines, and integrating with a customer engagement platform used in retail environments. You'll need to show where you've worked on highly available, high-traffic systems, collaborating closely with frontend engineers who are integrating booking and appointment functionality. Key Requirements: Strong commercial experience with Java and Spring Boot … Experience integrating backend services with third-party platforms and APIs Demonstrable experience working on high-availability, high-traffic applications ...

Engineer - Endpoint

Hiring Organisation
Algo Capital Group
Location
City of London, London, United Kingdom
ownership mentality, an engineering mindset, and a sense of urgency are critical. Troubleshoot and resolve complex endpoint, application, and user experience issues, particularly in high-speed, high-availability trading environments. Support endpoint platforms and services across Windows and macOS, with a focus on reliability, standardisation, security, performance ...

Engineer - Endpoint

Hiring Organisation
Algo Capital Group
Location
City of London, Greater London, UK
ownership mentality, an engineering mindset, and a sense of urgency are critical. Troubleshoot and resolve complex endpoint, application, and user experience issues, particularly in high-speed, high-availability trading environments. Support endpoint platforms and services across Windows and macOS, with a focus on reliability, standardisation, security, performance ...

AWS Solution Architect (Senior Manager)

Hiring Organisation
Anson Mccade
Location
City of London, London, United Kingdom
Employment Type
Permanent
point of application. The Opportunity A leading global professional services organisation is seeking an experienced AWS Solution Architect (Senior Manager) to join its high-performing cloud practice. This is an opportunity to work at the forefront of cloud transformation, partnering with tier-one clients across industries to design … compliance frameworks Implementing secure-by-design cloud environments Integration API design and event-driven architectures Hybrid and multi-cloud connectivity Non-Functional Design High availability, resilience, and scalability Disaster recovery and observability Governance & Compliance Cloud governance frameworks and cost control Auditing and compliance enforcement Desirable Skills AWS Specialty ...

Principal Network Solution Architect

Hiring Organisation
CACI Ltd
Location
City of London, London, United Kingdom
prospective customers (new logos). Engage with stakeholders from C-level executives to technical engineering teams , translating complex technical and business requirements into high‐level and detailed technical architectures. Provide expert consultancy on network strategy, transformation roadmaps, best practices, and emerging technologies. Build strong, long-term relationships that support … security technologies. Ensure all designs are scalable, resilient, secure, and aligned to customer requirements, technical strategy, and industry best practices Lead creation of high-quality architectural documentation, including HLA, HLD, LLD, standards, and design patterns. Ensure designs align with industry best practices, compliance requirements, and customer governance processes. ...

Principal Network Solution Architect

Hiring Organisation
CACI Ltd
Location
City of London, Greater London, UK
prospective customers (new logos). Engage with stakeholders from C-level executives to technical engineering teams , translating complex technical and business requirements into high‐level and detailed technical architectures. Provide expert consultancy on network strategy, transformation roadmaps, best practices, and emerging technologies. Build strong, long-term relationships that support … security technologies. Ensure all designs are scalable, resilient, secure, and aligned to customer requirements, technical strategy, and industry best practices Lead creation of high-quality architectural documentation, including HLA, HLD, LLD, standards, and design patterns. Ensure designs align with industry best practices, compliance requirements, and customer governance processes. ...

Python Technical Lead FinTech

Hiring Organisation
Run-Time Group Ltd
Location
City of London, London, United Kingdom
Employment Type
Permanent
Technical Lead Salary: £90-120K work model: Hybrid Were looking for a Python Technical Lead to drive the architecture, development, and delivery of high-performance financial systems. Youll lead a team of engineers building scalable platforms that power real-time transactions, risk analytics, and next-generation digital financial … build robust, secure, and scalable microservices using Python (FastAPI, Django, Flask). System Architecture Lead the design of distributed systems, event-driven architectures, and high-availability platforms. Team Mentorship Coach engineers, conduct code reviews, and foster a culture of continuous improvement. FinTech Platform Development Build systems for payments ...

GCP DevOps Engineer

Hiring Organisation
Tata Consultancy Services
Location
City of London, Greater London, UK
pipelines and cloud infrastructure on Google Cloud Platform (GC P).Collaborate with development and operations teams to automate deployments, monitor system performance, and ensure high availability and scalability of applicatio ns.Build secure, reliable, and cost-optimized cloud environmen ts.Troubleshoot issues across environments and maintain compliance with security best … seeker, beware of fraudulent recruitment activity and protect your interests! You can write to UKI.recruitme nt@tcs.com to report any fraudulent activity.Due to the high volume of applications, we will be unable to contact each applicant individually on the status of their application. If you have not received ...

Azure Cloud Engineer

Hiring Organisation
CDW UK
Location
City of London, Greater London, UK
performance, and scalability. Core responsibilities ·Design and support Azure and hybrid cloud infrastructure Manage server provisioning, configuration, and lifecycle Deliver platform optimisation (cost, performance, availability) Support networking fundamentals (DNS, routing, firewalls, connectivity) Build and maintain high availability and load-balanced environments Manage identity integration (Entra ID/ ...

Senior DevOps Engineer

Hiring Organisation
VIQU IT Recruitment
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£750 - 850 per day + Inside IR35
production support (to include OOH release support) * On-prem Kubernetes/OpenShift deployments * DevOps tooling updates - issue resolution, roadmap improvements * Linux system administration (high availability production environments) * Observability functions, designing and operating end-to-end logging, metrics, tracing, dashboards, and alerting systems using ELK, Splunk, Prometheus, Grafana. * Security ...

React.js UI Developer

Hiring Organisation
HCLTech
Location
City of London, Greater London, UK
Developer (React, TypeScript and Low-Latency) Role Overview- We are seeking a highly skilled UI Developer with strong expertise in building time-critical, high-availability, and high-performance applications. The ideal candidate will have hands-on experience across the full UI development lifecycle, including design, development, testing ...

Senior Software Engineer

Hiring Organisation
Circadia Health
Location
City of London, London, United Kingdom
Development (TDD): Write unit tests and integration tests using PyTest to ensure code quality and reliability. Conduct code reviews and implement best practices for high coding standards. Data Management: Manage patient data efficiently using databases (MySQL, PostgreSQL, MongoDB). Optimize database queries for performance and scalability while ensuring data … histories, and onboarding guides. What “Great” Looks Like (Example Profile) Designed backend systems supporting 50K–500K+ users or devices Built scalable ingestion pipelines for high-frequency time-series data Led EHR or healthcare integrations (HL7/FHIR) in production Reduced infrastructure costs while improving system reliability Designed multi-region ...

Application Support Engineer

Hiring Organisation
Tata Consultancy Services
Location
City of London, Greater London, UK
updates, and application patches under controlled processes. · Work closely with development teams to support bug fixes, enhancements, and releases. · Monitor application health, performance, and availability using monitoring and alerting tools. · Execute database queries and data corrections to support application functionality. · Support deployments, version upgrades, and environment changes for .NET … supporting C# applications. · Familiarity with scripting or automation for support activities. · Understanding of application security, authentication, and authorization concepts. · Experience supporting customer-facing or high-availability applications. Rewards & Benefits TCS is consistently voted a Top Employer in the TCS is consistently voted a Top Employer ...

Application Support Engineer

Hiring Organisation
Tata Consultancy Services
Location
City of London, London, United Kingdom
updates, and application patches under controlled processes. · Work closely with development teams to support bug fixes, enhancements, and releases. · Monitor application health, performance, and availability using monitoring and alerting tools. · Execute database queries and data corrections to support application functionality. · Support deployments, version upgrades, and environment changes for .NET … supporting C# applications. · Familiarity with scripting or automation for support activities. · Understanding of application security, authentication, and authorization concepts. · Experience supporting customer-facing or high-availability applications. Rewards & Benefits TCS is consistently voted a Top Employer in the TCS is consistently voted a Top Employer ...

Senior Platform Engineer - Boutique Hedge Fund - New York

Hiring Organisation
Mondrian Alpha
Location
City of London, Greater London, UK
developers and quant teams. You will work closely with cross-functional teams to deliver a fully automated, self-service platform, ensuring seamless deployment and high availability across critical systems. You should have strong experience managing cloud infrastructure, with a deep understanding of Kubernetes, Infrastructure as Code, and modern … increase on any base salary and is known for offering highly competitive bonuses. In addition, they provide an excellent benefits package and a collaborative, high-performance environment where engineers are empowered to make an impact. Apply now by following the link below or send your resume directly to harvey.gilbert ...

Technical Lead

Hiring Organisation
SR2 | Socially Responsible Recruitment | Certified B Corporation™
Location
City of London, Greater London, UK
architecture, engineering standards, system design, delivery quality, and modern development practice. The company builds enterprise-grade, real-time SaaS products used by complex, high-value customers. The engineering environment is collaborative, product-focused, and cloud-native, with autonomous squads working closely with Product and Platform Engineering. A major part … cross-functional engineering squad. Owning architecture and design discussions. Taking complex technical ideas from concept through documentation, delivery, and production. Ensuring security, scalability, availability, performance, and cost are considered throughout the development lifecycle. Providing hands-on technical ownership of critical engineering work. Mentoring engineers through pairing, code review, technical ...

Technical Lead

Hiring Organisation
SR2 | Socially Responsible Recruitment | Certified B Corporation™
Location
City of London, London, United Kingdom
architecture, engineering standards, system design, delivery quality, and modern development practice. The company builds enterprise-grade, real-time SaaS products used by complex, high-value customers. The engineering environment is collaborative, product-focused, and cloud-native, with autonomous squads working closely with Product and Platform Engineering. A major part … cross-functional engineering squad. Owning architecture and design discussions. Taking complex technical ideas from concept through documentation, delivery, and production. Ensuring security, scalability, availability, performance, and cost are considered throughout the development lifecycle. Providing hands-on technical ownership of critical engineering work. Mentoring engineers through pairing, code review, technical ...

Site Reliability Engineer

Hiring Organisation
Autonomai Recruitment
Location
City of London, Greater London, UK
500k split between base and bonus The company is seeking an experienced Site Reliability Engineer with strong Python and Linux skills to join a high-performance technology environment. The role is suited to someone who enjoys solving operational challenges, improving platform resilience, and supporting systems where uptime, speed … automation and tooling. Deep hands-on Linux experience in operational environments. Strong understanding of ops, incident management, and service reliability. Experience supporting low-latency, high-availability, or mission-critical systems. A calm, structured approach to troubleshooting and problem-solving. Good communication skills and the ability to work closely ...

VDI Platform Engineer (VMWare)

Hiring Organisation
VIQU IT Recruitment
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - 800 per day + Inside IR35
skills: App Volumes or application layering tools Dynamic Environment Manager (DEM) or equivalent NSX or network segmentation in VDI environments Experience in regulated or high-availability environments ...

Senior Backend Developer

Hiring Organisation
HCLTech
Location
City of London, Greater London, UK
Kotlin engineers to support and extend a cloud‐hosted platform used for bookbuilding issuances across Investment Banking Capital Markets. These roles will join a high‐caliber London front‐office engineering team building a new issuance platform to replace a legacy bookbuilder. This is a hands‐on engineering role with … first development, and continuous refactoring. Engineers are expected to contribute across development, integration, and production support, working closely as a team to maintain a high standard of code quality and system reliability. Location: London Required Skills • Strong commercial experience building backend services in Kotlin • Deep experience with XP practices ...

Real-Time Architect

Hiring Organisation
Digisourced
Location
City of London, Greater London, UK
Sect or: Financial Servic es What You'll Be Working On • Architecting large-scale, business-critical real-time platf orms• Designing high-performance distributed systems and streaming architect ures• Driving scalability, resilience, fault tolerance and latency optimisa tion• Defining architecture standards and supporting engineering teams across deli very … Proce ssing✔ Kubernetes & Cloud-Native Plat forms✔ Redis, Hazelcast or I gnite✔ Performance Engineering & Latency Optimis ation Ideal Back ground• Experience designing low-latency, high-availability pla tforms• Strong understanding of messaging protocols and distributed archite ctures• Proven track record delivering scalable real-time systems in complex enviro ...

Real-Time Architect

Hiring Organisation
Digisourced
Location
City of London, London, United Kingdom
Sect or: Financial Servic es What You'll Be Working On • Architecting large-scale, business-critical real-time platf orms• Designing high-performance distributed systems and streaming architect ures• Driving scalability, resilience, fault tolerance and latency optimisa tion• Defining architecture standards and supporting engineering teams across deli very … Proce ssing✔ Kubernetes & Cloud-Native Plat forms✔ Redis, Hazelcast or I gnite✔ Performance Engineering & Latency Optimis ation Ideal Back ground• Experience designing low-latency, high-availability pla tforms• Strong understanding of messaging protocols and distributed archite ctures• Proven track record delivering scalable real-time systems in complex enviro ...