Reactive Markets is the 2026 OTC Trading Platform of the Year ( Risk.net ). Our network handles over $75 billion in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 60+ of the world's leading liquidity providers.

We build trading systems that operate at the edge of what's technically possible — where nanoseconds matter and a dropped message costs real money. Our engineering team is small, senior, and deeply invested in the craft of building cutting edge, reliable, high-performance systems.

As an Operations Engineer, you will ensure the stability, performance, and availability of the Reactive trading platform. This is a hands-on, technical operations role — focused on production systems, infrastructure, and trading workflows rather than client relationship management.

You'll work closely with Engineering, Product, and internal stakeholders as the first line of defence for live trading systems. TechOps owns Level 1 and Level 2 support — monitoring response and alert triage through to the deeper technical investigation, configuration delivery, and post-release verification that sits beneath it — escalating to Level 3 (Engineering and Infrastructure) only when an issue genuinely requires code changes or deep infrastructure intervention. While the role involves supporting client onboarding and integrations, the emphasis is on technical delivery, system correctness, and incident response — not sales or account management.

Reactive runs a globally distributed, follow-the-sun operations team, and we are hiring across our UK, US, and Singapore hubs. You'll provide operational coverage across your regional trading session — the eyes on the platform when your region is live — and hand over cleanly to the next hub as the day moves. In each region you own the full TechOps remit: monitoring and incident response through the session, plus the configuration delivery, onboarding execution, and change work that keeps the platform growing. The UK and US roles are remote; the Singapore role is office-based.

We are a small team that has turned operations into a genuine engineering discipline, and we are investing heavily in AI-assisted tooling and knowledge engineering to keep it that way. This role suits someone with experience in trading or FinTech operations who enjoys working close to production systems, solving complex problems, writing things down properly, and taking ownership in a fast-moving environment.

What You'll Work On

• Monitor live trading systems across multiple regions, venues, and asset classes — you are the eyes on the platform during the trading session
• Own Level 1 and Level 2 response: triage alerts, run standard runbook actions (restart, rollback, failover, feature flag), investigate deeply, declare severity, and coordinate incidents — escalating to Level 3 (Engineering / Infrastructure) only when code or deep infrastructure intervention is genuinely required
• Participate in failover and disaster-recovery readiness — rehearsed, playbook-driven, and time-bound
• Drive root-cause analysis and blameless post-incident reviews, turning every incident into a runbook or a tooling improvement

• Deliver the production-change pipeline that brings new clients, liquidity providers, venues, and capabilities live — the largest share of the work
• Configure and maintain FIX sessions by function — streaming, RFQ, algo, and post-trade — alongside cross-rates, indications of interest, subscriptions, certificate rotations, and pool registrations
• Execute changes safely against the platform's deployment configuration, with schema updates, ACL coordination, and post-release verification
• Support migrations, decommissioning, and the follow-on work that keeps the production estate coherent as it grows

• Own the technical execution of client and LP onboarding: credentials, IPs, conformance and UAT testing, cross-connects, day-1 readiness, and post-go-live verification
• Act as the technical point of contact during onboarding, giving Client Services the information they need to manage the relationship
• Monitor and validate FIX message flows, identifying issues related to execution, routing, or market-data
• Maintain clear, accurate documentation for configurations, onboarding steps, and troubleshooting

• Contribute to capacity and infrastructure planning — session load balancing, gateway placement, and utilisation monitoring — jointly with Performance Engineering and Infrastructure
• Coordinate with external vendors and counterparties: network and colocation providers, post-trade vendors, and liquidity providers and their infrastructure teams
• Identify recurring issues and contribute to long-term fixes and preventative improvements
• Help build operational tooling, automation, runbooks, and the knowledge corpus — including AI-assisted investigation and documentation — that reduce toil and make the platform less dependent on individual memory

What We Need

• 2+ years' experience in operations or production support within trading or FinTech
• Working knowledge of the FIX protocol , ideally in FX or electronic trading environments
• Understanding of trading infrastructure, networking, and low-latency connectivity
• Experience with monitoring and alerting tools in live production environments
• Linux fundamentals — our platform runs on Linux throughout
• Comfortable with configuration-as-code — Git , structured config (YAML), and making changes that are reviewed, version-controlled, and verified before they reach production
• Scripting and automation (e.g. Bash , Python ) — used daily to investigate, automate, and reduce toil; you don't need to be a software engineer, but you should be able to read and write working scripts

• You own it. When a production issue lands, you take responsibility — you investigate, you escalate when needed, you close the loop. You don't wait to be told
• You stay calm under pressure. Trading systems don't pause for debugging. You can think clearly, prioritise effectively, and communicate status when things go wrong
• You write things down. Runbooks, configuration notes, post-incident reviews — documentation is how we scale knowledge across a distributed team. If it's not written down, it doesn't exist
• You communicate. Clear, proactive communication with engineers and non-technical stakeholders alike. When something breaks, people need to know what's happening and what you're doing about it
• You improve things. You spot recurring problems and fix them properly — automation, better tooling, clearer processes. You don't just fight the same fires repeatedly
• You embrace AI tooling. We use AI tools to amplify our operational capability — from incident investigation to documentation. You should be curious and willing to learn, and comfortable helping build the corpus that makes those tools better

What You Get

• Real systems — a market-leading trading platform with genuine scale and technical depth
• Breadth — exposure to multiple asset classes, LP integrations, and global trading infrastructure
• A genuinely technical Ops role — this is engineering-led operations with ownership and impact, not ticket-shuffling
• An excellent team — experienced engineers who care about craft, collaborate openly, and hold each other to high standards
• Ownership — small teams, clear accountability, direct impact on the platform and our clients
• Competitive package — competitive compensation and benefits aligned to your local market
• Flexible working — remote-friendly in the UK and US; office-based and collaborative in Singapore. We trust our people to deliver
• Growth — as the platform scales, so does the opportunity. Operations engineers who understand the full system are invaluable

We believe in transparency, honest feedback, and writing things down. We celebrate delivery, not activity. We frame AI as empowering people — removing toil, amplifying capability, enabling higher-value work.

We aim to build systems that don't depend on the heroics of individuals to maintain and support — systems and processes that are resilient, documented, and sustainable.

Our Hiring Process

We keep our process focused and respectful of your time. Our process follows three stages.

Stage 1: Initial Conversation with Talent Acquisition

Format: Video call, ~30-45 minutes

Stage 2: Hiring Manager Conversation with the relevant team lead or hiring manager

Format: Video call, ~60 minutes

Stage 3: Technical Interview with two members of the relevant engineering team

Format: Video call, interactive session, ~60 minutes

What to expect in each stage will be explained by Talent Acquisition if you're invited to interview. Throughout the process, we aim to keep momentum with no unnecessary delays between stages, and feedback typically comes within a few business days.

*Please note that depending on availability, Stage 2 and 3 may swap around.

How to Apply

Please apply directly via this job posting — all applications, including those submitted via LinkedIn, are managed through our applicant tracking system, so you'll always land in the same place regardless of where you found this role.

Right to Work: Candidates must have the existing right to work in the country associated with the location advertised for this role (UK, US, or Singapore, as applicable). We are not currently able to offer visa sponsorship for this role in any location.

Equal Opportunities: Reactive Markets is an equal opportunities employer. We welcome applications from all qualified candidates regardless of age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.

Reasonable Adjustments: If you need any adjustments or support during the application or interview process, please let us know — we're happy to accommodate.

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