Ncounter

C++ Software Engineer London Hybrid (2-3 days per week) Competitive salary + bonus Ncounter is partnering with a leading trading technology group to hire an exceptional C++ Software Engineer to build and evolve high-performance order gateway systems used in fast-moving fixed income markets. This is a hands-on role developing ultra-low-latency services that handle order validation, routing and exchange connectivity - the backbone of real-time trading. You'll join a collaborative team of developers, quants and platform engineers, working across a high-availability C++ codebase to deliver fast, resilient and observable services. You'll be empowered to design, implement and test software that directly impacts trading performance, scalability and reliability. Key Responsibilities: • Design and develop high-throughput order gateway components in modern C++ • Implement robust connectivity, order validation and routing logic for fixed income markets • Profile and optimise multi-threaded code paths, eliminating performance bottlenecks • Apply concurrency, lock-free and memory-efficient techniques to maximise throughput • Collaborate with quantitative researchers, traders and SRE teams to deliver reliable releases • Contribute to automated testing, verification and CI/CD pipelines • Provide 2nd/3rd line application support, analysing production telemetry and driving improvements Core Skills & Experience: • Strong proficiency in modern C++ (C+ or later) and STL • Deep understanding of multi-threading, low-latency optimisation and Linux systems • Experience working on high-frequency or real-time systems (financial or otherwise) • Familiarity with network programming, serialization and distributed architectures • Strong analytical and debugging skills, using profiling tools to measure performance • Exposure to Python, Bash, or similar for automation and testing is advantageous • Knowledge of fixed income products (corporate bonds, treasuries, IRS, CDS) is helpful This is an opportunity to work at the heart of a global trading platform, building technology that traders and researchers rely on every day. If you're a passionate C++ engineer who thrives on writing elegant, high-performance code, we'd love to hear from you. Apply now through Ncounter for a confidential discussion and to learn more about this role.

Networking Specialist Location: London (Hybrid Working Available) Industry: Global Financial Services / Institutional Asset Management Clearance: Right to work in the UK required A globally recognised financial institution is hiring a Core Networking Specialist to join its high-performance infrastructure team. This firm plays a critical role in global markets, offering integrated investment services to institutional clients and managing trillions in assets. Known for its pioneering work in ETFs and commitment to data-driven innovation, it operates across 28+ countries and places strong emphasis on operational excellence and collaboration. You'll design and optimise network infrastructure supporting real-time trading, analytics, and global operations. This role covers enterprise networking across data centres, campuses, and cloud environments - balancing performance, scale, and resilience in demanding financial settings. Key Responsibilities Design and implement scalable, high-availability network solutions (LAN, WAN, Campus, Cloud). Translate requirements into robust, well-documented architectures. Lead network delivery projects; coordinate with vendors and internal teams. Provide L3 escalation and proactively improve network performance. Drive automation and evaluate emerging technologies for impact and efficiency. What We're Looking For 7+ years' network engineering experience in enterprise or financial environments. Deep understanding of BGP, OSPF, EVPN, VLAN/VxLAN, MLAG, STP. Hands-on with Arista/Cisco; strong troubleshooting tools (Wireshark, netcat, etc.). Familiar with network security, automation (Python, Ansible), and observability stacks (Prometheus, Grafana). Excellent communicator with experience delivering in high-stakes, collaborative settings. STEM degree and CCNP/CCIE preferred. Why Join? Join a trusted global institution where networking is core to performance. You'll work on critical infrastructure supporting real-time financial systems and collaborate with expert teams across the globe. Expect meaningful projects, technical autonomy, and long-term career investment.

Full-Stack Developer (C# / React) London Hybrid (3 days per week) £80,000 to £90,000 base + bonus Ncounter are supporting a high-performing technology team as they expand their web engineering capability and continue to modernise the platforms that power real-time digital marketplaces. We're looking for experienced Full-Stack Developers who enjoy variety, technical challenge, and building well-structured software that others can depend on. You'll work within a cross-functional engineering group that takes real pride in collaboration and code quality. The role involves building high-performance, event-driven applications, with a focus on reliability, modularity, and scalability across both front-end and back-end services. In the role you will: • Build and enhance web applications using C# (.NET 8) and React with TypeScript • Design reusable components and frameworks to accelerate product delivery • Collaborate closely with other engineers to define solutions and solve complex technical challenges • Contribute to peer reviews, documentation, and mentoring within the team • Take ownership of quality, testing, and continuous delivery improvements We're looking for: • Strong hands-on experience across modern web technologies and frameworks • Proficiency in C# or an equivalent object-oriented language, plus React or similar JavaScript frameworks • A genuine interest in clean code, developer experience, and team-wide collaboration • Someone curious, pragmatic, and motivated to deliver maintainable, high-quality systems This is a rare opportunity to join a team that balances engineering rigour with creative freedom. Expect an environment that encourages experimentation, technical growth, and knowledge sharing-alongside regular hackathons, socials, and a positive, open culture. If you're an engineer who values both autonomy and teamwork, and want your code to make a visible impact, we'd love to speak with you. Apply today or get in touch for a confidential chat.

Product-Focused Backend Engineer - Functional Programming & Distributed Systems London (Hybrid) £120,000-£160,000 + Equity At Ncounter, we're partnering with a cutting-edge AI company on a mission to redefine how professionals in highly regulated industries interact with complex, multi-modal data. Their platform empowers users to deploy custom no-code AI agents that produce verifiable outputs with full transparency - ensuring trust, compliance, and control remain central to every decision. As a Backend Engineer, you'll join a growing team working at the forefront of AI infrastructure. This isn't just about clean code or strong delivery - it's about ownership, product intuition, and building for scale. You'll be part of a lean, high-calibre engineering function where every member contributes to planning, testing, analysis, and execution. What You'll Be Doing: Building and evolving APIs that serve as the backbone for internal systems and customer-facing applications Scaling the platform to support heavy, multi-tenant usage patterns and high-throughput AI workloads Applying foundation models (GPT-4.1, Claude 4, Gemini 1.5 and successors) to real-world, multi-modal data challenges Shipping to production daily in collaboration with Product and Design to solve real user problems Playing an active role in shaping team goals, defining technical metrics, and prioritising outcomes over ticket-chasing Your Background: Hands-on experience with functional programming (Elixir is a plus, but other languages like Scala, Haskell, Clojure, Go, Node.js, or F# are welcome) Proven track record of building and scaling distributed backend systems Solid understanding of infrastructure-as-code and cloud orchestration (AWS, Terraform, Docker) Familiarity with queue management, observability tooling, and shipping in fast-paced environments Awareness of GenAI and prompt engineering, or a keen interest to develop expertise in this area A self-starter attitude, with a strong sense of product ownership and a passion for solving end-user challenges This is a unique opportunity to work on real-world applications of cutting-edge AI, contributing to a platform where engineering excellence and product thinking go hand-in-hand. If you're looking for a role with tangible impact and huge technical scope, we'd love to hear from you. Reach out today to start the conversation.

Cloud Architect - Defence Corsham, 4 days per week on-site Permanent £80-90k + benefits DV Clearance (active or lapsed within 12 months) Join a major defence cloud transformation programme, designing and securing mission-critical systems. As a Cloud Architect , you'll shape secure architectures, embed controls, and ensure compliance across one of the UK's most sensitive programmes. What You'll Do Design & implement secure cloud architectures (IAM, encryption, VPC). Lead risk assessments, gap analyses & threat modelling. Advise on compliance (GDPR, NCSC Principles, ISO 27001). Configure cloud-native security tools & integrate with SIEM (Splunk, Chronicle). Embed security in CI/CD pipelines with DevOps teams. Support incident response & recovery for cloud-native environments. What You Bring Strong cloud architecture background. Knowledge of UK regulatory frameworks. IaC experience (Terraform/Deployment Manager). Understanding of monitoring, logging & network security. Consulting mindset with clear communication. Bonus: Cloud security certs, defence/public sector experience, Kubernetes/container security, Python/Bash scripting. Why Apply? This is your chance to apply DV-cleared cloud expertise where it matters most - defence, security, and national resilience. Competitive salary, strong benefits, and the chance to work on cutting-edge secure cloud projects. If you hold DV clearance and cloud security skills, we want to hear from you. Apply today and be part of the UK's frontline cloud security.

Lead Desktop Support Engineer £150,000-160,000 + Bonus & package London Hybrid Ncounter are supporting a world-leading financial services firm to hire a Lead Desktop Support Engineer. This is an opportunity to take ownership of a high-performing support function in a fast-paced trading environment, providing guidance to a global team and ensuring first-class service delivery across business-critical systems. The Role You will lead a small but impactful support team, ensuring operational stability across a large-scale international user base. With direct responsibility for mentoring engineers, refining processes, and driving service improvements, you'll play a pivotal role in how the business delivers technology to front, middle, and back-office teams. You will act as the key escalation point for complex issues, working closely with development, infrastructure, and trading support groups to resolve problems quickly and effectively. Proactive monitoring, incident management, and continuous improvement will sit at the heart of your role. Key Responsibilities Manage and mentor a team of Desktop Support Analysts, driving best practice and professional development Own the global incident, request, and escalation processes across desktop and end-user support Act as senior escalation for Windows, Office 365, Azure, and endpoint infrastructure challenges Collaborate with engineering teams on automation, scripting, and tooling improvements Oversee vendor relationships and guide technology strategy to align with business needs Drive root cause analysis, proactive monitoring, and resilience planning to minimise disruption What You'll Bring Proven experience in leading or mentoring technical support teams in high-pressure environments Expert knowledge of Windows, Active Directory, Group Policy, and Office 365 in enterprise environments Strong PowerShell scripting ability, with bonus points for Python or Bash Hands-on expertise with endpoint hardware and desktop troubleshooting Familiarity with networking and Linux fundamentals a plus A customer-first approach with the confidence to engage stakeholders at all levels Why Apply? This is a rare chance to step into a leadership role within a global trading environment, where technology is critical to performance. You'll be empowered to shape the future of end-user support, while collaborating with some of the brightest minds in financial services technology. If you're a technical leader who thrives under pressure and wants to make a lasting impact, we'd love to hear from you. Apply today to discuss further.

Software Developer in Test (C# or TypeScript) London Hybrid 3 days per week £65,000 to £75,000 base plus discretionary bonus Ncounter is partnered with a high-performing technology team who are looking for an SDET to help deliver complex, user-facing products. This is a role for someone who thinks like a developer but specialises in quality, working side by side with engineers to ship reliable, well-tested features at pace. Personality is just as important as technical expertise; they want someone collaborative and personable who will strengthen the team culture. You'll be joining the Web Engineering group, which works across React and C#, and the role sits within a developer-in-test model that blends QAs and developers. The team is made up of juniors through to a team lead, with a strong culture of collaboration, reviews and shared learning. Hybrid working is three days per week in a new central London office. Key responsibilities Design, extend and maintain modern automation frameworks Develop reliable UI and integration tests with Playwright or Selenium Collaborate with engineers to improve testability and overall code quality Contribute to CI/CD pipeline improvements Support delivery of key projects across the web portfolio Must-have skills Strong coding skills in C# or TypeScript Experience with at least one framework: Playwright or Selenium Ability to read and work with full-stack code (React / C#) Understanding of automation within a developer-in-test environment Clear, collaborative communication style Nice to have Knowledge of DevOps practices and CI/CD pipelines Broader test automation experience across multiple tools Exposure to cloud environments The interview process is structured and efficient: an initial 30-minute call with engineers, a focused take-home task in C# or TypeScript, then an onsite session with senior engineers and stakeholders. If you are motivated by building frameworks, improving automation reliability, and embedding quality at the heart of engineering, we'd like to hear from you. Please send your CV to Ncounter with a short note on your recent automation work and the impact it delivered.

Principal Python Engineer London Permanent Hybrid Ncounter is supporting a global investment firm in hiring a Software Developer to help design and evolve internal compute frameworks that underpin their trading and research platforms. This is a high-impact role, working at the intersection of software engineering and distributed systems, with the opportunity to build scalable tools and frameworks used across the business. What you'll do: Design, develop, and maintain performant, reliable frameworks and services in Python Build productivity tools and platforms that streamline workflows across investment and technology teams Contribute to code reviews and best practices, improving overall development quality Work across distributed systems, containers, and automation pipelines to deliver scalable solutions What we're looking for: 6+ years' professional software development experience Strong proficiency in high-performance Python (deep ecosystem knowledge and best practices) Experience with at least one JVM language (Java, Kotlin, Scala) is an advantage Background in distributed systems and large-scale compute frameworks Familiarity with Docker, Kubernetes, Linux environments, and CI/CD automation This role offers the chance to work on complex technical challenges at scale, with direct impact on high-performance computing platforms. If you're a skilled Python engineer with distributed systems expertise and want to join a world-class engineering environment, apply today for a confidential conversation.