Senior Software Engineer - Market Making

The Position

Our roster has an opening with your name on it. We’re growing our Market Making Engineering team that works on some of the coolest software in the industry - the systems that quote, price, and manage risk in real time for high-volume, high-velocity sports markets. This work spans the full RFQ/quote lifecycle (request → quote → accept → outcome) in low-latency, event-driven services.

The team you will join works with quantitative analysts and trading/risk stakeholders to implement and run market making strategies, while proactively identifying opportunities for technical innovation within the Risk and Trading organization. Our stakeholders are the people who establish prices and manage risk for the #1 sports book in America!

As a Senior Software Engineer within Fan Duel’s Market Making Technology team, you will be an essential part of a cross‑functional agile team that directly impacts our business. You will work collaboratively with a team to implement creative, high‑quality solutions, scope effort and timelines, and balance priorities of our stakeholders and engineering needs. This team will work closely to deliver exceptionally high‑quality software, while taking pride and ownership in testing, deploying, monitoring, and maintaining that software.

Our engineers own every part of the software delivery lifecycle
.

You will work directly with quantitative analysts at Fan Duel to improve our market making capabilities. You will be a domain expert on strategy implementation (quoting/decision logic) and how that fits into the larger Risk and Trading landscape — including real‑time risk controls, execution outcomes, and performance measurement. You will help ensure robust guardrails (limits, throttles, kill switch) and high‑fidelity decision logging so strategies can be debugged, replayed, and improved (e.g., quote ratio, win rate, expected vs realized margin).

You will go beyond the software developer role, and will be called upon to identify opportunities yourself in the quantitative space to innovate through technology.

• Experience in both quantitative modeling practices and coding. You will be assisting in the creation of models/strategies and working with other engineers on your team to productionalize this software You work in project ideas with stakeholders, and peers.
• You own parts of product and technology & become subject matter experts.
• You write simple and extendable code following standards and best practices. You test your code thoroughly.
• You help balance customer requirements with the team requirements.
• You help your team evolve by actively participating in the code review process, design discussions, team planning, and ticket/metric/COE reviews.
• You classify, store, and handle data in accordance with Fan Duel policies.
• You track security risks and mitigate and/or
  ** escalate
  * * them in a timely manner.
• You focus on operational excellence, constructively identifying problems and proposing solutions.
• You take on projects and make software enhancements that improve the team software and processes.
• You work to resolve the root cause of complex problems, leaving software better and easier to maintain than when you found it.
• You are able to train new team‑mates on how your team's software is constructed, how it operates, how secure it is, and how it fits into the bigger picture.
• You foster a constructive dialogue and seek resolutions in a professional way.
• You help recruit and interview for your team.
• You estimate stories/tasks accurately and deliver them in time.
• You mentor and help to develop others.
• On‑call rotation where required. You provide excellent customer support.
• You keep yourself up to date with market standards, open‑source frameworks.
• You build and evolve components that support real‑time quoting and decisioning with careful attention to latency, throughput, and correctness.
• You implement and maintain risk controls and guardrails (e.g., exposure checks, limits, throttling/filters, kill switch patterns).
• You ensure high‑quality decision logging so strategies can be debugged, replayed, and improved using real quote/fill outcomes.
• You partner with quants and…