{"id":155330,"url":"https://alion.io/job/flow-traders-senior-software-engineer-c-4","title":"Senior Software Engineer, C++ , Core Platform","company":{"id":54503,"name":"Flow Traders","domain":"flowtraders.com","url":"https://alion.io/company/flow-traders","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":93,"open_postings":40,"ghost_share":0,"stale_share":0.25,"repost_share":0.025,"time_to_fill_p50_days":59,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":114000,"max_usd":218000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":125},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Python","optional":false},{"name":"Rust","optional":false},{"name":"TypeScript","optional":false},{"name":"WebSockets","optional":false}],"status":"live","first_seen_at":"2026-06-25T07:38:56Z","employer_posted_date":"2026-09-25","last_verified_at":"2026-10-16T07:58:16Z","board_verified":true,"closed_at":null,"days_open":113,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":112},"description":"Flow Traders is looking for Senior C++ Software Engineers to join our growing team in Amsterdam. Software Engineers at Flow Traders provide us with our competitive edge, equipping Researchers and Traders with the information and capabilities that they need to make sound business decisions. C++ plays a critical role in our event-driven trading systems, which are designed to reliably handle vast amounts of data at ultra-low latencies.\nAs a C++ Engineer, you will build systems used to analyze and trade tens of thousands of products across hundreds of global trading venues every day. Working closely with Technologists, Quantitative Researchers, and Traders, you’ll guide the development of our in-house trading technology and optimize it to achieve market-leading performance and reliability. Our proprietary trading platform includes everything from venue connectivity (feed handlers and ordering gateways) to trading engines to shared platforms that enable us to work quickly and efficiently - we are proud of our open and collaborative culture, so you’ll have plenty of opportunity to find what fits you best.\nTeamwork is one of our most important firm values, and end users are never more than a short walk away, guaranteeing short feedback loops and immediate insight into the value that your code provides. To foster collaboration and innovation, we maintain shared libraries, encourage code re-use, and continuously evolve our views on application architecture.\nWhat you will do:\nMain technical activities include:\nFor all C++ openings:\nLead the development and global rollout of our Core platform used in multiple business/focus groups (Market data, Quantitative research, Pricing, Strategies)\nBe involved in the development process, which will be a fast-paced iterative process where you deploy your deliverables and validate them yourself and/or together with traders or quants\nDevelop tools/frameworks to deliver capabilities for tuning/develop data-driven systematic pricing and trading strategies\nWork together with focus group engineers, Quants and Technical traders to refine requirements, collect feedback, and iterate on design and implementation of platform requirements\nExchange Connectivity:\nWrite software that communicates with exchanges through their APIs, receiving market data and sending orders over the network in different protocols, such as FIX, Websocket or HTTP requests\nEnsure quality of software based on a set of testing suites, which you are expected to use, maintain and extend\nOptimize exchange communication through kernel bypass, optimizing TLS or the connection handling to an exchange\nResearch exchange behavior in detail to align our behavior to that of an exchange\nImplement these solutions using the provided exchange SDKs in different languages such as C++, Rust, Python, Typescript\nTrading Strategies:\nImplement trading algorithms based on requirements provided by traders and quants\nAcquire and develop the necessary trading knowledge to successfully translate the requirements into actual software implementation\nContinuously improve the stability, reliability, and performance of the trading engine\nEnhance monitoring and observability in collaboration with the Trading Operations team\nInvestigate and resolve production issues such as crashes, unexpected business logic behavior, and performance bottlenecks\nPrepare for releases and deployments of new trading engine versions\nWhat you need to succeed\nBSc, MSc, or PhD in Computer Science, Mathematics or equivalent\n5+ years post-graduation professional C++ software development experience (proprietary trading industry preferred)\n Ability to write clean, reliable, and highly scalable code\nGood knowledge of algorithms and data structures\nExperience in parallel, asynchronous, and multithreaded programming\n Interest in achieving maximum performance from available hardware and software\n Ability to communicate with technical and non-technical business colleagues\nWhat we offer\nAt Flow Traders, we create the conditions for hard-working, high-performing people to do their best work. From a thorough onboarding and ongoing access to Flow Academy, to latest technology and a collaborative, non-hierarchical culture, we give you the tools, ownership, and support to move fast and drive outcomes. We keep a close-knit, small-company feel while offering competitive salary, annual discretionary profit share, and comprehensive benefits, so talent can grow here, and stay here. See our benefits below:\nFlow Academy and opportunities to attend domain-related conferences\nDaily catered lunch, great coffee, and a fully stocked kitchen and snack bar\nIn-house Bar and Lounge with arcade, table tennis, billiards, and game consoles\nCompany boat\nIn-house gym and sessions with our nutritionist or personal trainer\nBi-weekly massages\nAnnual company trip and a variety of events throughout the year, such as the New Years Event\nGlobal rotations across our offices worldwide\nand more\nFlow Traders does not accept unsolicited resumes from any professional staffing or search firms. All resumes, and any other information identifying potential candidates, submitted to any employee at Flow Traders via email, the Internet or directly without a valid and signed search agreement will be deemed free to contact by Flow Traders without any restrictions and no placement fee of any kind will be paid in the event the candidate is hired by Flow Traders","description_format":"text","description_chars":5435,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-06-25T07:38:56Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-10-16T06:21:30+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":25,"band":"fade","label":"Fading","p_open":1,"p_active":0.693,"p_room":0.36,"age_days":112,"expected_fill_days":59,"reasons":["conf:2","velocity","win:tail","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/flow-traders-senior-software-engineer-c-4","json_url":"https://alion.io/job/flow-traders-senior-software-engineer-c-4.json","meta":{"generated_at":"2026-10-16T08:49:36Z","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":6837,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-17T00:00:00Z"}},"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":54503},"rest":"https://alion.io/mcp/rest/get_company?id=54503"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fflow-traders-senior-software-engineer-c-4"},{"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%2Fflow-traders-senior-software-engineer-c-4"},{"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%2Fflow-traders-senior-software-engineer-c-4"},{"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/flow-traders-senior-software-engineer-c-4\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fflow-traders-senior-software-engineer-c-4"}]}