FIX Connectivity Engineer | Experienced Hire

OverviewSusquehanna International Group is seeking a FIX Connectivity Engineer to support, enhance, and expand electronic trading connectivity for our global client facing brokerage trading business. This role will focus on onboarding and maintaining FIX-based client, broker, venue, OMS/EMS, and market connectivity across equities, options, FX, or other asset classes.The ideal candidate has strong hands-on experience with the FIX protocol, trading workflows, order management systems, certification testing, and production support in a brokerage / electronic trading environment. This person will work closely with trading desks, clients, exchanges, vendors, product teams, infrastructure, compliance, and application development teams to deliver reliable and well-controlled connectivity solutions.In this role, you will:Implement, configure, test, and support FIX connectivity for clients, counterparties, exchanges, ATSs, ECNs, brokers, OMS/EMS platforms, and trading vendors.Manage full connectivity onboarding lifecycle, including requirements gathering, session setup, message specification review, certification, production rollout, and post-go-live support.Analyze FIX messages across order entry, cancel/replace, execution reports, drop copy, allocations, and administrative workflows.Troubleshoot production issues involving order flow, rejects, sequence gaps, session disconnects, latency, routing behavior, and trade reporting discrepancies.Maintain and enhance FIX session configurations, routing rules, symbol handling, account mappings, entitlement controls, and message transformations.Partner with developers and infrastructure teams to improve connectivity platforms, monitoring, alerting, resiliency, and operational tooling.Work with business stakeholders to understand trading workflows and translate requirements into technical connectivity specifications.Participate in exchange, broker, and vendor certification testing.Support incident response, root-cause analysis, and remediation for connectivity-related issues.Provide occasional off-hours support for production releases, venue testing, market events, or critical incidents.What we’re looking forRequired Qualifications:3+ years of experience supporting or implementing FIX connectivity in a brokerage, trading firm, exchange, fintech, OMS/EMS vendor, or financial technology environment.Strong understanding of the FIX protocol, including session-level and application-level messages.Familiarity with electronic trading concepts, order lifecycle, routing, executions, allocations, and trade capture.Hands-on experience troubleshooting FIX sessions using logs, message viewers, network tools, or trading support platforms.Experience working in production support environments with change management, incident management, and release controls.Strong analytical, communication, and documentation skills.Ability to work directly with clients, vendors, traders, developers, and operations teams.Preferred Qualifications:Experience with SQL, scripting, or reporting tools.Familiarity with OMS/EMS platforms such as Bloomberg EMSX, Fidessa, FlexTrade, Charles River, Eze, Portware, or similar systems.Knowledge of exchange or market center connectivity, including order routing and drop copy.Experience participating in client-facing technical onboarding or production readiness reviews.Experience dealing with order routing in a global, multi-system environment.Experience working in a Linux environment.Ideal Candidate Will Have:Strong problem-solving under time-sensitive market conditions.Detail-oriented approach to protocol specifications, message flows, and production controls.Clear communication with both technical and non-technical stakeholders.Ownership mindset for production stability and client experience.Ability to manage multiple onboarding, certification, and support priorities simultaneously, where priorities may shift dynamically due to business needVisa sponsorship for work authorization is not available for this position now or in the future.About Susquehanna:Susquehanna is a global quantitative trading firm powered by scientific rigor, curiosity, and innovation. Our culture is intellectually driven and highly collaborative, bringing together researchers, engineers, and traders to design and deploy impactful strategies in our systematic trading environment. To meet the unique challenges of global markets, Susquehanna applies machine learning and advanced quantitative research to vast datasets in order to uncover actionable insights and build effective strategies. By uniting deep market expertise with cutting-edge technology, we excel in solving complex problems and pushing boundaries together.‌‌What we do:We are experts in trading essentially all listed financial products and asset classes, with a focus on derivatives trading. Through market making and market taking, we handle millions of trading transactions around the world every day, providing liquidity and ensuring competitive prices for buyers and sellers. While our presence in the market is broad, our trading desks are highly specialized, allowing for a deep understanding of unique drivers of each asset class.If you're a recruiting agency and want to partner with us, please reach out to View email address on click.appcast.io. Any resume or referral submitted in the absence of a signed agreement will not be eligible for an agency fee.#LI-ES1Job SummaryExperience Level: Experienced ProfessionalsJob Categories: Technology - Infrastructure, Support + Engineering