{"id":1602904,"url":"https://alion.io/job/susquehanna-international-group-trading-systems-c-developer","title":"Trading Systems C# Developer","company":{"id":4917,"name":"Susquehanna International Group","domain":"sig.com","url":"https://alion.io/company/sig","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"iCIMS","truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Sydney, Australia"],"countries":["AU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":62000,"max_usd":162000,"period":"year","method":"role_country_seniority_unknown","sample_n":29},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C#","optional":false},{"name":"Azure","optional":true},{"name":"Docker","optional":true},{"name":"Envoy","optional":true},{"name":"gRPC","optional":true},{"name":"JavaScript","optional":true},{"name":"Kong","optional":true},{"name":"Kubernetes","optional":true},{"name":"Machine Learning","optional":true},{"name":"Octopus Deploy","optional":true},{"name":"React.js","optional":true}],"status":"live","first_seen_at":"2026-10-01T19:35:46Z","employer_posted_date":"2026-10-01","last_verified_at":"2026-10-18T23:56:42Z","board_verified":true,"closed_at":null,"days_open":17,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":17},"description":"Overview\nSusquehanna is looking for a Trading Systems Developer to join our Options Technology team. In this role, you will analyze, design, and develop business-critical trading systems, taking projects through the full software development lifecycle - from requirements gathering to production release. Day to day, you'll collaborate with technologists, traders, and quantitative analysts to deliver optimal outcomes.\nWhat we’re looking for\nA bachelor's degree (or higher) in a technical or related discipline.\nA track record, working knowledge, or strong interest in options, trading, risk, or quantitative systems development.\nExceptional C# development skills, with deep knowledge of design, profiling, object-oriented programming, multi-threading, and performance - particularly in back-end development.\nPrevious experience or working knowledge of options, risk, pricing, and Greeks will be highly regarded\nNice to have\nExperience with microservices and cloud technologies (e.g., Azure Service Fabric, Envoy Proxy, gRPC, Protobuf, React JS, Docker, Kubernetes, Octopus Deploy, and the ELK Stack).\nWhat's in it for you\nOur flat hierarchy lets you drive meaningful impact by leveraging your expertise and taking ownership.\nGreenfield opportunity: a newly created role as we scale across APAC.\nPrivate healthcare and wellness initiatives.\nDaily office lunch allowance.\nEmployee Assistance and Education Assistance Programs.\nMatched donations and corporate discounts.\nThis role can be based in either Hong Kong or Sydney.\nAbout Susquehanna\nSusquehanna is a global quantitative trading firm powered by scientific rigor, curiosity, and innovation. Our culture is intellectually driven and highly collaborative, bringing together researchers, engineers, and traders to design and deploy impactful strategies in our systematic trading environment. To meet the unique challenges of global markets, Susquehanna applies machine learning and advanced quantitative research to vast datasets in order to uncover actionable insights and build effective strategies. By uniting deep market expertise with cutting-edge technology, we excel in solving complex problems and pushing boundaries together.\nWhat we do\nSusquehanna’s deep integration of trading, technology and quant research makes us experts in trading essentially all listed financial products and asset classes, with a focus on derivatives. We handle millions of trading transactions around the world every day as both a market maker and market taker. Our efforts provide liquidity and ensure competitive prices for buyers and sellers. While our presence in the market is broad, our trading desks are highly specialized to allow for a deep understanding of the unique drivers of each asset class.\nEqual Opportunity statement We’re committed to building a diverse and inclusive workplace. We encourage candidates from all backgrounds to apply and are happy to provide reasonable accommodations during the hiring process.\nIf you're a recruiting agency and want to partner with us, please reach out to . Any resume or referral submitted in the absence of a signed agreement will not be eligible for an agency fee.\n#LI-AK1","description_format":"text","description_chars":3186,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Education assistance"],"hiring_locations":[{"name":"Hong Kong","iso":"HK","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Hedge Funds & Alternative Investments"],"lifecycle":[{"event":"open","at":"2026-10-01T19:35:46Z"}],"visa":[],"liveness":{"score":10,"band":"cold","label":"Long shot","p_open":1,"p_active":0.276,"p_room":0.35,"age_days":15,"expected_fill_days":6,"reasons":["conf:0","velocity","win:tail","comp:brand"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/susquehanna-international-group-trading-systems-c-developer","json_url":"https://alion.io/job/susquehanna-international-group-trading-systems-c-developer.json","meta":{"generated_at":"2026-10-19T00:45:07Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":254,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-20T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4917},"rest":"https://alion.io/mcp/rest/get_company?id=4917"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsusquehanna-international-group-trading-systems-c-developer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fsusquehanna-international-group-trading-systems-c-developer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fsusquehanna-international-group-trading-systems-c-developer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/susquehanna-international-group-trading-systems-c-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsusquehanna-international-group-trading-systems-c-developer"}]}