Application Support Engineer

Come join oneZero Financial Systems! An exciting, fast‑growing company with Headquarters in Somerville, MA. oneZero empowers banks, brokerages and hedge funds with cutting edge trade routing and execution technology. Our platform, deployed with 200+ entities globally, features a low‑latency trading environment, integrations to the world’s leading execution venues, and reliable IT infrastructure and technical support—all designed to be customized and scaled to serve any business model and any size of market participant.

We take pride in our great work atmosphere and highly motivated team of engineers. We are currently looking for a motivated and talented Application Support Engineer to join our Somerville office.

The Operations Engineer position helps keep our production platforms stable, fast, secure, and well‑documented by monitoring live systems, executing defined operational procedures, and assisting with straightforward improvements that reduce recurring issues. This position is also responsible for planning, deploying, and supporting client implementations of oneZero's products, including bridging, aggregation, and reporting systems—coordinating readiness checks, basic configuration validation, and initial data flow verification.

• Monitor production systems and analyze alerts to determine severity, business impact, and appropriate response strategy using technical expertise and operational experience.
• Investigate system anomalies by correlating logs, metrics, and traces to identify root causes and determine remediation approaches.
• Determine and execute appropriate corrective actions based on assessment of technical risk, business impact, and available remediation options (e.g., service restarts, failovers, configuration adjustments, rollbacks).
• Exercise independent judgment to balance response speed against technical risk when selecting among multiple remediation options in consultation with industry best practices.
• Evaluate incident severity and business impact to determine when immediate action is warranted versus when to coordinate with engineering teams for complex or systemic issues.
• Evaluate and enhance runbooks, operational procedures, and monitoring strategies based on operational experience and evolving system requirements.
• Plan and coordinate deployments by assessing risk, determining validation strategies, monitoring key performance indicators, and making go/no‑go decisions during rollout phases.
• Plan and execute client implementations by evaluating readiness criteria, identifying technical dependencies, determining deployment sequencing, and designing validation strategies for bridging, aggregation, and reporting components.
• Assess client connectivity requirements and infrastructure readiness, making informed recommendations about configuration approaches and integration patterns to ensure successful production transitions.
• Partner with client‑facing teams to assess operational risks, define technical requirements, and determine handover readiness for steady‑state support.
• Identify recurring operational patterns and design automation solutions (scripts, tooling, monitoring enhancements) that improve efficiency and system reliability while maintaining appropriate safety controls.
• Analyze operational outcomes and document decisions, rationale, and results for auditability and continuous improvement.
• Lead post‑incident analysis by evaluating contributing factors and recommending process improvements, monitoring enhancements, or architectural changes.
• Analyze trade execution issues, pricing anomalies, and connectivity problems by evaluating FIX/API message flows to determine whether issues require operational intervention or engineering escalation.
• Assess and validate client onboarding prerequisites (API credentials, connectivity parameters, spread and routing configurations), making informed judgments about deployment readiness and identifying gaps requiring resolution.
• Evaluate liquidity provider and platform connectivity issues, determining whether problems stem from configuration, network, or systemic factors.
• Respond to client inquiries by analyzing technical issues,…