WebSocket jobs in Greenwich, CT

QA Engineer - Performance & Load Testing

New York, New York

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Today

Job Title: QA Engineer - Performance & Load Testing Location: New York, NY (Hybrid - 2-3 days onsite) Type: Long-Term Contract (1+ years, potential to extend or convert) The Opportunity We are helping a global financial services giant scale their premium dining division through a massive platform merger. If you want to build highly scalable, real-time infrastructure that powers millions of daily transactions, this is your chance. We need a 100% hands-on Performance & Load Testing expert to drive

Easy Apply

Contract

$50 - $80

Senior QA Engineer / Performance & Load Testing / NYC

New York, New York

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Today

Job Description A leading global financial services organization supporting millions of consumer transactions daily is seeking a QA Engineer specializing in Performance and Load Testing to support a major platform integration within its premium global dining division. As the organization brings together two major reservation platforms, this team is focused on ensuring the scalability, reliability, and performance of high-volume, real-time systems. As a Performance & Load Testing QA Engineer, you

Easy Apply

Contract

$60 - $90

Prediction Markets Trader

New York, New York

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18d ago

DRW is a major Chicago-based proprietary trading firm founded in 1992 by Don Wilson, specializing in diversified, technology-driven market-making and quantitative trading across asset classes including fixed income, options, derivatives, commodities, energy, equities, FX, and cryptocurrency. DRW is building out a dedicated prediction markets desk focused on platforms such as Polymarket and Kalshi. As a Prediction Markets Trader , you will develop, execute, and optimize high-conviction trading

Full-time

USD 175,000.00 - 200,000.00 per year

Senior Software Engineer (Core) - NYC- Leading Digital Asset Investment Technology

New York, New York

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16d ago

Summary Operating at the intersection of crypto and capital markets, my client builds high-performance trading technology for the rapidly evolving digital asset industry, supporting the entire trading lifecycle. They're looking for detail-oriented engineers with a track record of owning large-scale distributed systems to build the platform infrastructure that underpins their entire trading ecosystem. This role offers the opportunity to dig deep into high-performance, distributed systems engineer

Full-time

Staff Engineer, Full Stack

New York, New York

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Today

Staff Full Stack Engineer Company Description At Butterfly Network, we're leading a digital revolution in medical imaging, transforming an industry that has long relied on bulky, analog systems. With our proprietary Ultrasound-on-Chip technology, we're democratizing healthcare by shifting ultrasound from the expensive, stationary systems of the past to the connected, mobile, and software-enabled platforms of today. In 2018, we launched the world's first handheld, whole-body ultrasound, Butterf

Full-time

USD 200,000.00 per year

Engineering Manager, Trading Platform

New York, New York

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3d ago

Summary Topstep is looking for an Engineering Manager to lead a team within Trading Platform , the organization that builds and runs TopstepX. The platform spans order flow and execution, market data, and the services and integrations behind them - real-time systems thousands of funded traders rely on every day, where availability, performance, and correctness matter. This is a people-leadership role: you'll be accountable for your team's reliability, quality, and delivery, and for the health a

Full-time

USD 190,000.00 - 230,000.00 per year

Lead Software Engineer, Applied AI (Frontend Leading)

Remote or New York, New York

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Today

Our Business Technology organization builds secure and intelligent internal platforms that power our global workforce. As a Lead Software Engineer, Applied AI (Frontend Leading) , you will build intuitive, performant user interfaces and frontend integration libraries that make Generative AI (GenAI) and intelligent automation accessible and useful across IT, HR, Finance, Sales, Marketing, and Customer Support. In this role, you will bridge the gap between complex LLM orchestration and enterprise

Full-time

Senior Manager, Technology

New York, New York

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Today

Job Description The New York Stock Exchange, a subsidiary of Intercontinental Exchange, Inc. (ICE), presents a unique opportunity for a full-time hands-on Senior Manager of Engineering to lead a core engineering team responsible for maintenance and modernization of web-based test management platform for exchange testing. This role carries significant ownership - the test platform underpins quality assurance for all trading systems at NYSE. Responsibilities Own the technical roadmap for consolid

Full-time

USD 190,000.00 - 215,000.00 per year

Principal Full Stack Software Engineer

New York, New York

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Today

Principal Full Stack Engineer Company Description Butterfly Network, Inc. (NYSE: BFLY) is driving a digital revolution in ultrasound imaging and sensing with its proprietary Ultrasound-on-Chip semiconductor technology and software solutions. Butterfly first proved its technology in the point-of-care ultrasound market - commercializing the world's first single-probe, whole-body portable ultrasound device, which is now on its best-selling, third-generation: Butterfly iQ3 . The Company combines i

Full-time

USD 200,000.00 - 230,000.00 per year

Senior Mobile Engineer

New York, New York

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26d ago

Summary Are you a mobile engineer who thrives on building exceptional user experiences, bringing a new product to life, and raising the technical bar for the team around you? As a Senior Mobile Engineer at Topstep, you'll play a foundational role in building our mobile trading platform with React Native and TypeScript. Mobile is new for Topstep, and the product is at an early MVP stage-an opportunity to shape both the trader experience and the engineering foundations behind it. You'll help buil

Full-time

USD 155,000.00 - 200,000.00 per year

Software Engineer, US Life (2027 Permanent)

New York, New York

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Today

Applicants must be authorized to work in the United States on a permanent basis without requiring employer sponsorship now or in the future. At this time, we are unable to consider candidates who require current or future sponsorship, including Optional Practical Training (OPT) or Curricular Practical Training (CPT). Software Engineer, US Life (2027 Permanent) Munich Re sees the use of medical data as instrumental in enhancing the customer experience and expanding insurability for life insuran

Full-time

USD 125,000.00 - 145,000.00 per year

Lead Software Engineer

New York, New York

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Today

Job Description Job Description Join a team where your technical expertise shapes the future of financial technology at one of the world's most influential firms. At JPMorganChase, you'll have the opportunity to work on complex, high-impact challenges that drive real business outcomes within a culture that values innovation, inclusion, and continuous growth. As a Lead Software Engineer at JPMorgan Chase within Consumer Community Banking, you are an integral part of an agile team that works to en

Full-time

Senior Java Engineer

New York, New York

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Today

About the Company Interactive Brokers Group, Inc. (NASDAQ: IBKR), a member of the S&P 500, is a global financial services company headquartered in Greenwich, Connecticut, with offices in over 15 countries. Through its affiliates, Interactive Brokers provides automated trade execution and custody of securities, commodities, foreign exchange, and prediction markets on over 170 markets in numerous countries and currencies. For more than four decades, Interactive Brokers has focused on technology,

Full-time

Back-End Developer (Python/API)

New York, New York

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Today

Software Guidance & Assistance, Inc. (SGA) is searching for a mid-level Back-End Developer (Python/API). Flexible hiring structure, open to direct-hire assignment OR contract-to-perm assignment with one of our premier AI and Financial Technology clients. Must be local to NYC or Miami The successful candidate will join a small, highly collaborative engineering team responsible for designing and building a cloud-native Portfolio Management System for a hedge fund from the ground up. This is a dedi

Full-time

USD 120,000.00 - 140,000.00 per year

Lead Software Engineer

New York, New York

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Today

Full-time

Director, Full Stack Engineering

New York, New York

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Today

Director, Full Stack Engineering Company Description Butterfly Network, Inc. (NYSE: BFLY) is driving a digital revolution in ultrasound imaging and sensing with its proprietary Ultrasound-on-Chip semiconductor technology and software solutions. Butterfly first proved its technology in the point-of-care ultrasound market - commercializing the world's first single-probe, whole-body portable ultrasound device, which is now on its best-selling, third-generation: Butterfly iQ3 . The Company combine

Full-time

USD 250,000.00 per year

Python Development Operations Engineer Vice President

New York, New York

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Today

Overview of Citi: Citi is a world-leading global bank. We have approximately 200 million customer accounts and a presence in more than 100 countries and jurisdictions worldwide. We provide consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management. We enable clients to achieve their strategic financial object

Full-time

USD 142,320.00 - 213,480.00 per year

Senior Full-Stack Engineer

Remote

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Today

We are embarking on an exciting initiative to redefine how our enterprise visualizes, understands, and discovers its internal platform capabilities. We are evolving our existing platform from a static, generated catalog into a live, AI-enriched capability map. This dynamic ecosystem will power interactive chatbot experiences, provide strategic roadmap insights, perform automated gap analyses, and generate graph-oriented knowledge outputs. As a Software Engineer on this team, you will work at the

Full-time

Lead Software Engineer, Applied AI (Frontend Leading)

Remote

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Today

Full-time

Sr. Mobile Engineer II

Remote or Chicago, Illinois

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Today

Disclaimer: Please be advised that the most accurate and up-to-date information about our open roles-including job descriptions, compensation, and benefits-can only be guaranteed on our official job board. For the latest listings and details, please visit: ;br> JOIN US ON OUR MISSION TO BECOME THE #1 RETAIL TRADING PLATFORM IN THE WORLD Welcome to the dynamic world of NinjaTrader! As an industry-leading trading platform and futures broker, we're empowering traders to take control of their finan

Full-time

USD 140,000.00 - 190,000.00 per year

WebSocket jobs in Greenwich, CT, USA