26 to 49 of 49 FIX Protocol Jobs in the City of London

looking for: Commercial experience with financial instruments and markets (equities, futures, options, forex) and understanding of historical data usage in algorithmic trading Familiarity with market data formats (MDP, ITCH, FIX, SWIFT, proprietary exchange APIs) and market data providers Strong programming skills in Python (Go/Rust is a nice to have) Experience with ETL processes and data pipeline architecture More ❯

book dynamics and pricing techniques Proven track record in Java programming, specifically in building fast, low-latency trading systems Strong familiarity with market data and order execution protocols (e.g. FIX, binary, or custom APIs) Hands-on experience with JVM tuning, garbage collection, and deep performance analysis Knowledge of fast messaging and data serialization technologies for high-speed environments Proficiency More ❯

high-performance Java applications for FX pricing, trading, and risk. Optimise and maintain multithreaded systems to support low-latency execution. Work with large-scale, high-throughput messaging systems (e.g., FIX, Kafka). Collaborate with cross-functional teams to deliver robust, scalable software solutions. Continuously improve performance, reliability, and observability of trading systems. Required Skills & Experience: Strong proficiency in Core … multithreading and concurrency . Solid understanding of low-latency design patterns and performance optimisation. Experience building and supporting real-time or high-throughput systems. Familiarity with messaging protocols (e.g., FIX, MQ, Kafka). Good grasp of data structures, memory management, and JVM tuning. Strong problem-solving and debugging skills in a time-sensitive environment. Desirable: Previous experience in an More ❯

trading platforms. Strong documentation and requirements gathering skills, with a pragmatic approach to technical detail. Comfortable liaising across business, technical, and client-facing teams to drive delivery. Knowledge of FIX protocol, microservices, or cloud-native architectures is advantageous. This is an exciting opportunity to shape cutting-edge trading software used by top-tier financial institutions, while working at More ❯

background in Python development and automation testing. Expertise in server and database layer testing, and familiarity with tools such as Pytest, is highly desirable. Experience with trading systems or FIX Protocol would be considered a significant advantage. The successful candidate will have excellent communication skills, a proactive mindset, and a proven track record of building scalable and effective More ❯

in dynamic, fast-paced environments Bonus but not essential: Financial markets knowledge—strong technical chops matter most Stand outs if you have worked with but not essential: SBE Aeron Fix Protocol and Equities What’s On Offer: Base salary: £150k - £200k GBP Meaningful equity stake + cash bonus Comprehensive benefits (healthcare, pension, wellness allowance) Hybrid work model, generous More ❯

as Senior Developer around digital applications, software engineering, microservices and cloud. This could include Core Java, Spring Boot, Hibernate/JPA and UI using React, Ember, JavaScript or HTML. FIX Experience Cloud experience with containerization (Docker, Kubernetes), Database (Relational and NoSQL), Messaging (RabbitMQ), Repository (BitBucket), or Helm Charts would be highly regarded (not all necessary). Good knowledge of More ❯

Qualifications: 3+ years of expert-level C++ on Linux in trading, HFT, or real-time systems Proven track record of shipping mission-critical, latency-sensitive software Deep experience with FIX, binary protocols, and market data ingestion Obsession with performance, minimalism, and elegant code More ❯

expanding our electronic trading infrastructure and client connectivity. Key Responsibilities: Client Onboarding: Design and implement onboarding processes for new electronic trading clients, ensuring seamless integration and optimal experience. API & FIX Documentation: Maintain, update, and improve technical documentation for REST, WebSocket, and FIX APIs. Integration Support: Develop and maintain sample code and technical guides to showcase integration workflows with … Generate and analyze execution performance metrics and PnL reports to support internal teams and clients. Required Qualifications: Experience: Minimum of 5 years of hands-on experience with Java and FIX protocol. API Integration: Strong experience integrating with REST and WebSocket APIs . Database Skills: Proficient in SQL , with a focus on PostgreSQL . Industry Knowledge: Deep understanding of order More ❯

Job title: Production Support Engineer - Python Client: Elite FinTech Salary: £80,000-£160,000 + Bonus Location: London/Hybrid Skills: Linux, Python, SQL, Front Office, FIX, Finance The role: My client are seeking an Engineer with a broad skillset to support a range of technology within their stack. The position has a heavy focus on the support of … have: Experience of working in Linux environments Strong understanding of Application architecture Scripting skills utilising Python An understanding of relational databases and querying (SQL, Postgres etc.) SQL troubleshooting skills FIX skills highly desirable A personality! The organisation is one of the most elite FinTech firms globally and you can expect to find: Stunning offices Generous benefits and bonus package More ❯

opportunity to build high-speed, data-intensive applications that scale elastically meet tough performance requirements. You will work within a pod of 5 on core trading services, order routing, FIX connectivity, real-time price services, database designs, cloud-based micro-services, big data solutions and more. Good general Core Java, algorithms etc is required and the role will be More ❯

high-throughput trading components Work closely with quant and trading teams to optimise execution performance Build and maintain messaging infrastructure using technologies such as Aeron, SBE, Disruptor, Chronicle, and FIX Tune the JVM for microsecond-level performance (0GC, CPU affinity, memory management) Contribute to architecture and design decisions for latency-sensitive services Ensure code quality through rigorous testing, benchmarking More ❯

JavaScript (ES6+) Proven experience delivering front-end applications in electronic trading environments Strong understanding of performance optimisation and low-latency UI design Experience with real-time data technologies (WebSockets, FIX, etc.) Familiarity with containerized front-end platforms such as OpenFin is a plus Prior exposure to Fixed Income products (Rates, Credit, Bonds) or other capital markets Experience in data More ❯

Role: Contract Business Analyst (Exchange Trading) Domain: Energy & Commodities Trading Project: Trading Exchanges (Third Party Networks, OMS/EMS, FIX messaging) Location: London (hybrid) Rate: £800/d (inside IR35) Contract: 6 months (multi-year scope) X4 Technology are partnered with a global energy trading offering a contract Business Analyst (Exchange Trading) role on a high-profile, multi-year … aims to streamline the lifecycle of derivatives trading by automating execution, enhancing price transparency and improving customer experience. This specific project focuses on exchange connectivity, OEMS integration (Trading Technologies), FIX protocol implementation and market data integration to deliver a scalable, compliant trading infrastructure. Responsibilities of the Business Analyst (Exchange Trading) Leverage expertise in global future exchanges to gather … and clarify business requirements Serve as SME for trading exchange, OEMS, FIX protocol and market data integration Translate requirements into technical solutions across the project lifecycle Analyse and map RFQ, order and trade lifecycles to design solutions that enhance trading system quality and efficiency Liaise between business, development, QA, infrastructure and production support to ensure smooth delivery Troubleshoot More ❯

Computer Science with 5+ years experience using Python within Financial Services/Back Office environments Demonstrable experience processing large datasets (PostgreSQL and data frame) Exposure to trade booking/FIX protocol Ability to create scalable, geographically distributed and high availability architectures Background creating reporting and reconciliation applications Undertsanding of OTC products with CDS, Interest Rate Swaps, Variance Swaps … hugely beneficial The key skillset is Python, but your expertise should extend to managing large datasets with PostgreSQL, and you should be well-versed in trade booking using the FIX protocol. A deep understanding of trading, booking, and position keeping is essential, along with experience in scalable and high-availability architectures will be advantageous. You will be capable of More ❯

Support team at another financial services firm within Fixed Income (ideally Rates). Previous experience supporting vendor platforms (ION, Murex, Bloomberg) Previous experience in the following technologies: Unix, SQL, FIX Experience of technical support across a demanding user base in Fixed Income. The company are operating a hybrid way of working. You will be expected to work in the More ❯

determinism, and reliability are paramount. Key Responsibilities: Design and implement high-performance C++17/20 components for ETF quoting, hedging, and execution systems. Build and maintain market connectivity layers (FIX, binary protocols, multicast) for ETF venues and exchanges. Develop real-time pricing engines for ETF baskets, including NAV tracking, fair value modeling, and arbitrage logic. Engineer deterministic, lock-free … free, wait-free), and template metaprogramming. Proven experience in low-latency trading systems, preferably in ETFs, equities, or delta-one products. Strong knowledge of networking protocols (TCP/UDP, FIX, multicast), kernel bypass, and hardware timestamping. Experience with real-time market data processing, order book construction, and tick-to-trade pipelines. Experience with exchange simulators, backtesting frameworks, and latency More ❯

logs, etc.) Experience building systems with sub-millisecond latency targets . Strong exposure to low-latency messaging technologies (e.g. Aeron , Chronicle Queue, SBE, UDP multicast). Market connectivity (e.g. FIX, exchange/broker APIs) experience. More ❯

Python, Rust, or Bash. Excellent problem-solving skills with a proactive and ownership mindset. Strong verbal and written communication skills. Nice to have: Knowledge of trade flow protocols like FIX, BOE, OUCH/ITCH, PILLAR, SBE, OMEX. Experience with FPGA-based applications and L1 network design. Familiarity with various network switch architectures and vendors. If you’re ready to More ❯

software, DevOps, and cybersecurity. Architect for determinism: tight latency budgets, real-time observability, and synchronized timekeeping (e.g., PTP). Oversee development of client connectivity layers including native protocols and FIX gateways optimized for sub-microsecond response. Ensure robust pre-trade and post-trade risk controls are embedded without compromising latency or throughput. Drive integration with third-party clearing services More ❯

trading tech divisions, working with supporting traders and engineers get the most out of the apps and the platform, and work on improving and automating current applications. Stack: Python, FIX, SQL The company is a tech firm before a hedge fund, and thus they hire the most talented engineers, offering them London leading compensation and a hybrid work model. More ❯

Job title: Production Support & Platform Engineer/Application SRE – Integration & Project Management Client: FinTech Salary: £90,000-£170,000 Location: London/Hybrid Skills: Linux, SQL, Python, FIX, SRE, Infrastructure, Project Management, Coordination, Trading The role: My client are looking for a talented individual with a broad skillset to perform a unique role, bridging the gap between Production and More ❯

Job title: Production Support & Platform Engineer/Application SRE – Integration & Project Management Client: FinTech Salary: £90,000-£170,000 Location: London/Hybrid Skills: Linux, SQL, Python, FIX, SRE, Infrastructure, Project Management, Coordination, Trading The role: My client are looking for a talented individual with a broad skillset to perform a unique role, bridging the gap between Production and More ❯

Customer Success Manager (EMEA) London – hybrid working model Salary – up to £80,000 (DOE) We are seeking a dedicated Customer Success Manager . In this client-centric, fast-paced, and results-oriented role, you’ll be the primary point of More ❯