{"id":2444683,"url":"https://alion.io/job/reactive-markets-senior-infrastructure-engineer","title":"Senior Infrastructure Engineer","company":{"id":7325,"name":"Reactive Markets","domain":"reactivemarkets.com","url":"https://alion.io/company/reactive-markets","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"DevOps","role_family":"DevOps","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":74000,"max_usd":142000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":8},"experience_years_min":null,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"AWS","optional":false},{"name":"BGP","optional":false},{"name":"Git","optional":false},{"name":"Linux","optional":false},{"name":"Python","optional":false},{"name":"TCP/IP","optional":false},{"name":"Terraform","optional":false}],"status":"live","first_seen_at":"2026-10-13T09:51:55Z","employer_posted_date":"2026-10-13","last_verified_at":"2026-10-14T13:48:22Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Senior Infrastructure Engineer\nRemote (UK-based), with occasional on-site work at our data centres | Full-Time\nAbout Us\nReactive Markets is the 2026 OTC Trading Platform of the Year (Risk.net). Our network handles over $75 billion in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 50+ of the world’s leading liquidity providers.\nWe build trading systems that operate at the edge of what’s technically possible - where nanoseconds matter and a dropped message costs real money. Our engineering team is small, senior, and deeply invested in the craft of building cutting edge, reliable, high-performance systems.\nThe Role\nWe’re looking for a Senior Infrastructure Engineer to help run and grow the network and cloud estate behind our trading platform. Networking in our colocation data centres is the core of the role. The estate spans London, New York and Singapore, and from Q1 2027 a new Tokyo data centre.\nThis is a hands-on role in a small, expert infrastructure team. You’ll work closely with our Head of Infrastructure, following problems from the cross-connect through hosts, containers and AWS. You’ll also help keep infrastructure delivery on track, from timelines and reporting to working closely with our TechOps team.\nWhat You’ll Work On\nLow-latency networking across our colocation sites: switching and routing, cross-connects, BGP peering with liquidity providers and clients, and the fabric that carries our trading traffic\n\nBringing new sites to application-ready, starting with Tokyo\n\nOur hybrid connectivity into multi-region AWS, including Direct Connect, routing and failover\n\nLinux hosts and containers on the critical path, with every change made through code (Ansible, Git, Terraform), never by hand\n\nMonitoring and alerting that catches problems before clients do, plus runbooks and post-incident reviews that someone else can follow\n\nPlanning and capacity: forecasting growth, setting timelines and reporting progress to TechOps and engineering\n\nWhat We Need\n4+ years running production infrastructure in a latency-sensitive environment, such as HFT, an exchange, market data or bank trading infrastructure\n\nStrong networking: hands-on routing and switching (MLAG, LACP, VLANs), BGP in production, and a solid grasp of low-latency behaviour such as buffers, microbursts and congestion handling\n\nColocation experience: cabinets, cross-connects, remote hands and vendor management\n\nSolid Linux (RHEL) and TCP/IP, and the ability to trace a problem from the wire to the application\n\nInfrastructure as code and containers as your default way of working\n\nWorking knowledge of AWS networking, and the confidence to pick up the rest of our stack. Networking depth matters more to us than any particular cloud or platform tooling\n\nMethodical, evidence-led troubleshooting and clear documentation\n\nA strong plus:\nProject management experience: owning timelines, reporting progress, and working with ops teams to hit deadlines\n\nKernel bypass (Onload/ef_vi), PTP and time synchronisation\n\nExperience bringing up a new colo site\n\nFIX protocol or OTC FX market knowledge\n\nPython for tooling\n\nWorking pattern: Infrastructure changes are often scheduled outside trading hours, including weekends, and the team shares an on-call rota. We’re a team with flexible hours, so time worked out of hours is taken back during the week. Day-to-day work is remote, with occasional visits to our data centres, most often in London (Slough).\nWhat You Get\nReal ownership of a live global trading network, hands-on, with few layers of process\n\nA build-out year, with a new Tokyo data centre in Q1 and more growth ahead\n\nA senior seat in a small, expert team where your changes ship and are measured\n\nCompetitive package - up to 38 days leave (inc. bank holidays), private health insurance, pension, life insurance, dental/optical cashback, cycle to work, socials and offsites\n\nRemote-friendly working with flexibility around out-of-hours work\n\nGrowth as the estate scales\n\nWe believe in transparency, honest feedback and writing things down, and we aim to build systems that don’t depend on the heroics of individuals.\nOur Hiring Process\nWe keep our process focused and respectful of your time. Our process follows three stages:\nStage 1: Initial Conversation with Talent Acquisition\nFormat: Video call, ~30-45 minutes\nStage 2: Technical Deep Dive with our Head of Infrastructure\nFormat: Video call, interactive session, ~90 minutes\nStage 3: Leadership Conversation with our CDO\nFormat: Video call, ~45 minutes\nWhat to expect in each stage will be explained by Talent Acquisition if you’re invited to interview. Throughout the process, we aim to keep momentum with no unnecessary delays between stages, and feedback typically comes within a few business days.\nHow to Apply\nPlease apply directly via this job posting - all applications, including those submitted via LinkedIn, are managed through our applicant tracking system, so you’ll always land in the same place regardless of where you found this role.\nRight to Work: Candidates must have the existing right to work in the UK. We are not currently able to offer visa sponsorship for this role.\nEqual Opportunities: Reactive Markets is an equal opportunities employer. We welcome applications from all qualified candidates regardless of age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.\nReasonable Adjustments: If you need any adjustments or support during the application or interview process, please let us know - we’re happy to accommodate.\nData Protection: By applying, you consent to Reactive Markets processing your personal data for recruitment purposes, in line with our privacy policy.\n#Hiring #Infrastructure #Networking #LowLatency #TradingTechnology #FinTech #Remote #Colocation","description_format":"text","description_chars":5861,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Health insurance","Life insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Financial Software & Embedded Finance","Stock Exchanges & Market Infrastructure"],"lifecycle":[{"event":"open","at":"2026-10-13T13:12:58Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":61,"reasons":["conf:1","win:early"],"computed_at":"2026-10-14T06:34:16Z"},"pay":null,"html_url":"https://alion.io/job/reactive-markets-senior-infrastructure-engineer","json_url":"https://alion.io/job/reactive-markets-senior-infrastructure-engineer.json","meta":{"generated_at":"2026-10-14T17:23:48Z","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":22290,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-15T00:00:00Z"}},"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":7325},"rest":"https://alion.io/mcp/rest/get_company?id=7325"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Freactive-markets-senior-infrastructure-engineer"},{"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%2Freactive-markets-senior-infrastructure-engineer"},{"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%2Freactive-markets-senior-infrastructure-engineer"},{"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/reactive-markets-senior-infrastructure-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Freactive-markets-senior-infrastructure-engineer"}]}