Software Engineer | API

The Firm   XTX Markets is a leading algorithmic trading firm which uses state-of-the-art machine learning technology to produce price forecasts for over 50,000 financial instruments across equities, fixed income, currencies, commodities and crypto. It uses those forecasts to trade on exchanges and alternative trading venues, and to offer differentiated liquidity directly to clients worldwide. The firm trades over $250bn a day across 35 countries and has over 250 employees based in London, Singapore, New York, Paris, Bristol, Mumbai, Yerevan and Kajaani. We leverage the talent of the people who work here, modern computational techniques and state-of-the-art research infrastructure to analyse large data sets across markets quickly and efficiently, to maximize the effectiveness of our proprietary trading algorithms. We are actively seeking new methods and ideas. The models that drive our trading strategies have evolved considerably over the last 10 years, from econometric methods that gave our company its name, to trees, to neural networks, to modern deep learning architectures. XTX Markets has an unrivalled level of computational resources in the trading industry, with a growing research cluster currently containing over 25,000 GPUs with 650 petabytes of usable storage. Teams across the firm include world-class researchers with backgrounds in pure math, programming, physics, computer science and machine learning. The firm is also constructing a large-scale data centre in Finland to future-proof its significant computational capabilities. At XTX Markets technology is our business and we are a diverse organization which attracts outstanding talent from across all industry backgrounds. We are focused on teamwork, and our people collaborate on all aspects of the business, working openly and with respect for each other, our clients and the market. Our culture is non-hierarchical and one where everyone is valued. We strive for excellence in everything we do.   The Role The OTC Trading Development team is currently looking to hire an experienced developer focused on trading system development.   The Team: * Architects, implements and maintains a diverse set of trading systems: whilst ETFs will be the immediate focus for this position, the team works to build a wide range of systems which span prop trading on venue and OTC liquidity provision platforms across other asset classes (primarily Equities, FX and Crypto). * Receives reference implementations of models from quants, hard control requirements from Risk and Compliance, and system ergonomics requests from Trading Analysts, often working closely with those teams to find the best direction. * Is highly autonomous in how we work, maximising safety and velocity. We build and maintain multiple trading systems with a fraction of the headcount of our competitors, so it's critical we can eliminate bureaucracy. * This will be the team’s first hire in New York. This role will involve working on our ETF trading system. The role will require close platform with stakeholders to the system in NYC e.g. Business Development, as well as with OTC’s developers in London. * There are no out-of-hours support responsibilities involved in this role. * There may be an occasional requirement for travel to our London offices. The Technology:   * Consists of high-performance trading venue integrations, fair value generation, trading algorithms, risk controls and real time UIs implemented from business requirements. * Is predominantly implemented in Kotlin, with limited amounts of C++. Older parts of the codebase may use Python or Java; this is a decreasing minority. * Is tailored to a wide range of latency and throughput requirements. Where necessary we use a thread-per-core architecture, implement large parts of the network stack and integrate with network card APIs directly. Attributes Someone that would be an excellent fit: * Is an experienced coder, with a solid understanding of Computer Science fundamentals. * Has several years of experience working in Kotlin or other object-oriented languages like Java, C++, or C#. * Knows how to build technology quickly and safely using a variety of testing methods. * Unblocks the team with code reviews that prioritise correctness over style preferences. * Has experience in systems with requirements of microseconds per request or gigabits per second per thread. * A well-founded understanding of ETFs is desirable, though we are open to candidates with any domain knowledge, experience or evidence of interest within finance. Benefits * Extensive medical and wellness benefits including gym membership. * Breakfast and lunch provided daily. * Beautiful Hudson Yards office. * 25 days paid holiday per year + statutory holiday and paid sick days. * Generous 401k contributions. * We work 4 days per week in the office, 1 from home unless stated otherwise. The base salary range for this role is between $200,000 to $300,000 depending on relevant job-related skills and experience. You will be eligible for participation in a discretionary annual performance bonus scheme and will enjoy a comprehensive package of benefits. All bonuses, benefits, and any sign-on payments are in addition to the base salary range stated.

OUR MISSION At Omnea, we’re reinventing how enterprise businesses operate, starting with the most painful parts: procurement – where a single purchase can drag on for months, trigger 50+ emails, and pull in Finance, Legal, Security, and IT just to get something approved. We’ve raised $75M from Khosla Ventures, Insight Partners, and Accel to change that. Our AI-native platform connects every person, step, and system so buying is fast, safe, and efficient – one place to request, automated approvals and renewals, real-time supplier risk, and complete spend visibility. The opportunity is massive. Every enterprise on the planet has this problem and nobody has solved it. We’ve 10x’d ARR to double-digit millions in 18 months and are trusted by global enterprises like Spotify, MongoDB, Monzo, and Albertsons. We’re now the 4th fastest growing startup in Europe & the Sunday Times' #1 Best Medium Sized Tech Company To Work for. Our team previously scaled Tessian (cybersecurity tech, backed by Sequoia, Balderton, Accel, acquired post-Series C), and our team includes ex-founders operators who’ve grown unicorns, shipped world-class products, and executed at the highest levels. You’ll work alongside leaders like Ben, Abs, Sabrina, and Rebe. FIND OUT MORE ABOUT THE TEAM AND LIFE AT OMNEA HERE. THE ROLE We're looking for a Senior Customer Engineer to be the first senior technical customer hire in our New York office. This is a foundational role. You’ll own Omnea’s most complex customer-side technical work in the US, act as a senior technical authority across the business, and help establish how we support and scale enterprise customers from our New York hub. You’ll operate at the intersection of Customers, Product, and Engineering — remaining deeply hands-on while also shaping standards, processes, and expectations for customer engineering as we grow our US presence. You’ll work directly with some of the world’s leading tech companies (Spotify, TeamViewer, McAfee, Pleo, and more), partnering with senior stakeholders to solve complex problems and deliver exceptional outcomes. You’ll be joining us at a pivotal moment. We’ve just raised $50M in Series B funding from Khosla Ventures, Insight Partners, Accel, Point Nine, and First Round Capital. In the past year we’ve grown revenue 5x, tripled our customer base, and maintained >99% retention with enterprises like Spotify, Wise, Albertsons, Adecco, and McAfee. As our first senior customer engineering hire in New York, you’ll play a key role in establishing Omnea’s technical credibility and customer experience in the US. WHAT YOU CAN EXPECT BE PART OF THE “SWAT TEAM” FOR COMPLEX SOLUTIONS AT OMNEA You’ll own and lead the resolution of Omnea’s most complex and high-impact customer challenges — from intricate configurations and integrations to cross-system issues that require deep technical investigation. As the senior presence in New York, you’ll set the bar for technical quality, decision-making, and customer engagement, while partnering closely with teams in Europe to ensure consistency as we scale globally. You’ll also support the Customer and Commercial teams on the most sophisticated US enterprise use cases, helping design technically robust solutions when required. SERVE AS OUR FIRST LINE OF DEFENSE FOR HIGH-IMPACT CUSTOMER ISSUES You’ll act as the escalation point for critical customer issues in the US, owning them end-to-end and driving them to resolution with urgency and clarity. You’ll help define how we triage, prioritise, and communicate around complex customer issues — ensuring we deliver an exceptional experience for enterprise customers as we grow our US footprint. BE THE VITAL LINK BETWEEN OUR CUSTOMERS AND THE PRODUCT ROADMAP You’ll identify patterns across US customer issues and translate them into clear, actionable input for Product and Engineering. You’ll work closely with Product Managers and Engineering Leads to prioritise and scope work that reduces friction, improves reliability, and accelerates adoption for enterprise customers. You’ll help define engineering requirements, review solutions, and ensure outcomes meet real customer needs. BECOME THE GO-TO EXPERT ON OMNEA’S PRODUCT AND ARCHITECTURE IN THE US You’ll maintain a deep, end-to-end understanding of Omnea’s architecture, configuration patterns, and integrations. You’ll be the first point of reference in the US for complex technical questions, helping customers and teammates alike understand how to get the most out of the platform. You’ll document learnings and best practices so knowledge scales beyond any single individual. CREATE THE “SOURCE CODE” FOR DOING THINGS EXCELLENTLY AS WE SCALE IN THE US You’ll help establish the foundations of customer engineering in New York — from tooling and documentation to ways of working with Product, Engineering, and Customer teams globally. You’ll contribute to building Omnea’s Knowledge Repository, Product Accreditation, and Customer Training materials, ensuring they meet the needs of US enterprise customers and scale as the team grows. ABOUT YOU You’re a senior, high-performing technical professional who thrives in ownership-heavy environments and enjoys being an early, foundational hire. You’re comfortable operating with ambiguity, making sound technical judgments, and representing the company with senior customer stakeholders. You have 6–10+ years of experience in a high-performance environment, with a strong track record in customer-facing engineering, technical support engineering, or similar roles working with complex SaaS products. You’ve consistently operated at a senior level — owning critical customer issues, leading complex initiatives, mentoring others, and acting as a trusted technical authority. YOU HAVE A STRONG TECHNICAL FOUNDATION You have strong systems intuition and experience working with complex software platforms, integrations, workflows, or APIs. You’re comfortable diving deep into unfamiliar systems, reasoning about architecture, and guiding others through technical problem-solving. Some hands-on coding or scripting experience is expected, though you don’t need to be a full-time software engineer. EXCELLENT COMMUNICATION You communicate clearly and confidently with both technical and non-technical audiences. You’re comfortable working with senior customer stakeholders and internal leaders, and you can influence outcomes through clear thinking, strong written communication, and sound judgment. LEADERSHIP MINDSET You naturally take ownership beyond your immediate remit. You enjoy mentoring others, raising standards, and building scalable ways of working — even before there’s a formal team around you. AN ENTREPRENEURIAL SPIRIT You want to be part of building Omnea’s US presence from the ground up. You’re motivated by impact, responsibility, and the opportunity to shape how a category-defining company operates in a new market. You’re comfortable rolling up your sleeves and doing what’s needed to make something great. At Omnea, we embrace diversity. To build a product that's loved by everyone, we're best served by a team with all sorts of backgrounds, experiences, and perspectives. We encourage you to apply even if your experience doesn't quite match the full job spec! And regardless of your race, religion, colour, gender, or anything else! If you think you could be a good fit for Omnea, please reach out. A FEW THINGS TO NOTE: * We offer competitive geo-localised benefits, and you can check out our UK Benefits Package here and our US Benefits Package here. * We work Tuesdays, Wednesdays & Thursdays in-person at our offices. At this early stage of our company life-cycle it's important to us that we get this together-time, and you can read more about why we believe this is a winning move here * We're commercial, ambitious and we don't pretend otherwise! We're actively seeking folks looking to make the most of a career-defining opportunity, with the hunger to be part of building something really impressive. You can see our values here and our Omnea Future Founder's fund here! * We sometimes use AI note-takers to help us transcribe interview notes, so we can be more present in your interview. If you'd like to opt out of us using automatic transcribers, please note this in the free text field in your application, otherwise we'll take your application as confirmation that you're happy for us to use notetakers (whether added to video calls or in the background). We are proud to be recognised for both our culture and product, and we are just getting started. Join us as we grow! LEGAL NOTE: IF YOU ARE VIEWING THIS POSTING OUTSIDE OF THE OMNEA CAREERS' PAGE, THIS MAY BE AN AUTO-GENERATED ADVERTISEMENT AND MAY LACK THE FULL RANGE OF ADVERTISED INFORMATION - PLEASE CLICK THROUGH TO THE POSTING AT HTTPS://JOBS.ASHBYHQ.COM/OMNEA TO VIEW ADDITIONAL ADVERTISED INFORMATION ON THIS POSTING. ADDITIONALLY, WHERE ROLES HAVE HARD-SPECIFIED REQUIREMENTS (E.G. [X] DAYS IN OFFICE, UNABLE TO PROVIDE VISAS, ETC), IF IN YOUR APPLICATION YOU PROVIDE DETERMINISTIC CHECK-BOX CONFIRMATION THAT YOU DO NOT MEET THE HARD-SPECIFIED REQUIREMENTS, DETERMINISTIC (NOT AI OR SUBJECTIVE) AUTOMATIC REJECTION CRITERIA ARE IN PLACE.