Senior Software Engineer, Core

Senior Software Engineer – CoreTalos is seeking a Senior Software Engineer to join the Core team, focused on building and maintaining the foundational platform infrastructure that powers the entire Talos trading ecosystem.This role centers on high-performance, distributed systems engineering: designing low-latency messaging infrastructure using Aeron, building and evolving the API layers (FIX, WebSocket, REST) consumed by product teams across the firm, and maintaining the sequencer and market data distribution pipelines that sit at the heart of Talos' architecture. You will work on deeply technical problems at the intersection of distributed systems, financial protocols, and infrastructure reliability.This is an opportunity to go deep on platform craft — shaping the infrastructure that every team at Talos builds on, and solving problems where the margin for error is low and the design space is wide open.ResponsibilitiesDesign, develop, and maintain high-performance platform services including API gateways (FIX, WebSocket, REST), and the core libraries that product teams across Talos build on.Build and evolve Aeron-based messaging infrastructure for reliable, low-latency communication.Tackle hard distributed systems problems end-to-end: ordering and determinism guarantees, zero-downtime deployments, active-active architectures spanning cloud regions, and crash-consistent recovery.Work cross-functionally to ensure platform primitives meet the throughput and latency requirements of real-time trading workflows, including market data distribution at scale.Provide product teams with reusable service infrastructure to build scalable, reliable, and cost-efficient services.Qualifications7+ years of backend engineering experience with deep proficiency in Go, C++, Java, Rust or similar systems languages.Demonstrated ownership of large-scale distributed systems, from initial design through deployment, scaling, and long-term operations.Strong systems-level fundamentals: concurrency primitives, memory layout, I/O models, database design, network protocols, and the performance implications of each.Experience designing systems with stringent correctness guarantees — ordering, consistency, durability — not just ones that work under normal conditions.Own projects end-to-end: take work from problem definition through design, implementation, and rollout, and see it through to completion without needing to be chased.Track record of leading technical decisions: navigating ambiguity, defining architecture, making meaningful trade-offs, and bringing a team along on the reasoning.Comfortable operating at multiple levels of abstraction, from API contract design down to diagnosing latency spikes at the socket or disk layer.PreferredExperience with Aeron or comparable low-latency messaging frameworks (e.g., Chronicle, LMAX Disruptor, ZeroMQ).Hands-on experience building geo-distributed or multi-site systems with active-active replication and regional failover.Familiarity with FIX protocol (4.x/5.x) or other structured financial messaging formats.Background in trading infrastructure, market data systems, or other latency-sensitive financial platforms.Experience with sequencer design, write-ahead logging, or custom persistence engines.BenefitsYou will also enjoy a comprehensive array of competitive benefits, regardless of your location, within our warm, welcoming, and ambitious company culture. Some of our benefits include:Retirement plan contributionsUnlimited Vacation + a PTO bonus: Employees that take 15 days of vacation, with 5 days being consecutive, receive a $2000 USD bonus.Bonus and stock ownershipMedical, dental, and vision insurancePaid parental leave for 20 weeks, after 1 year of serviceGlobal offsites and team outingsA one-time stipend towards at-home office set-up for all employeesA wellness credit of $50 accrued monthly, to go towards things like gym memberships, ski-passes, and work out classes.A lunch credit of $25 USD towards lunches for days in-officeDonation matching up to $100 USD annuallyOther in-office perks: Catered lunches on Tuesdays, snacks, and drinksTalos is proud to be an Equal Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. Talos is committed to providing reasonable accommodations for candidates with disabilities in our recruiting process. If you need any assistance or accommodations due to a disability, please let us know at View email address on click.appcast.io Trading, LLC and its affiliates ("Talos") strongly discourage submission of unsolicited resumes from any source other than directly from a candidate.Talos will NOT pay fees, commissions or compensation of any kind ("Fees") for any placement or hire resulting from the receipt of an unsolicited resume. Talos will consider any candidate for whom an Agency has submitted an unsolicited resume to have been referred by the Agency free of any charges or fees and Talos reserves the right to contact, interview, and hire the candidate directly.Agencies, search firms, recruitment firms and similar organizations ("Agencies") must obtain advance written approval from Talos's internal recruiting team to submit resumes, AND must sign a valid fully executed placement agreement with Talos in order to be eligible to receive any Fees from Talos. Talos will not pay a Fee to any Agency that does not have such agreement in place. By submitting a resume without a signed agreement, you acknowledge and accept these terms.© Talos Trading, View email address on click.appcast.io By submitting your application and pursuing job candidacy, you consent to the processing of your personal information in connection with our Applicant & Employee Privacy Notice.