{"id":2177160,"url":"https://alion.io/job/optiver-senior-information-security-engineer","title":"Senior Information Security Engineer","company":{"id":54501,"name":"Optiver","domain":"optiver.com","url":"https://alion.io/company/optiver","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":86,"open_postings":141,"ghost_share":0.241,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":56,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Security","role_family":"Security","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":["Sydney, Australia"],"countries":["AU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":95000,"max_usd":223000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":1891},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"DLP","optional":false},{"name":"Linux","optional":false},{"name":"Microsoft Entra ID","optional":false},{"name":"Nessus","optional":false},{"name":"PowerShell","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"SIEM","optional":false},{"name":"Windows","optional":false},{"name":"Kong","optional":true}],"status":"live","first_seen_at":"2025-12-18T02:26:30Z","employer_posted_date":"2026-10-02","last_verified_at":"2026-10-12T07:19:56Z","board_verified":true,"closed_at":null,"days_open":298,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":298},"description":"Who we are \nOptiver is a global market maker founded in Amsterdam, with offices in London, Chicago, Austin, New York, Sydney, Shanghai, Hong Kong, Singapore, Taipei and Mumbai. Established in 1986, today we are a leading liquidity provider, with close to 2,000 employees in offices around the world, united in our commitment to improve the market through competitive pricing, execution and risk management. By providing liquidity on multiple exchanges across the world in various financial instruments we participate in the safeguarding of healthy and efficient markets. We provide liquidity to financial markets using our own capital, at our own risk, trading a wide range of products: listed derivatives, cash equities, ETFs, bonds and foreign currencies. \nWhat you’ll do \nWe are seeking a motivated, hands-on Senior Information Security Engineer to join our security team. In this role, you will help protect, monitor, and continuously improve the security of our global systems including cloud (AWS and M365) and on-premises infrastructure. You’ll play a central part in risk mitigation, incident response, automation of security operations, and embedding security best practices across our organisation. An engineering mindset, attention to detail, and a preference for pragmatic solutions are essential to keeping our systems operating. \nMain responsibilities include: \nMonitor daily security operations, identify threats, investigate alerts, and respond to incidents across cloud and on-prem environments. \nStrengthen Microsoft 365 and Entra ID security through Conditional Access, MFA, PIM, Defender for Endpoint/Identity/O365, and tenant configuration hardening. \nBuild and maintain security automation using Python and PowerShell, with a strong focus on reducing manual processes and improving detection and response. \nIntegrate systems using APIs (Graph API, REST, etc) to enhance security workflows. \nPerform vulnerability assessments, review system configurations, and develop practical mitigation strategies. \nContribute to incident response activities including investigation, containment, communication, and remediation. \nWork closely with engineering, technology, and business teams to embed security best practices. \nWho you are \nOptiver needs our next Information Security Engineer to have: \nAt least 5 years experience in an information security or technical engineering role. \nAbility to apply analytical thinking to technical problems within a fast-moving environment. \nComfortable with both Windows and Linux environments; familiarity with common security technologies (firewalls, endpoint protection, log management, vulnerability scanning, network security). \nSolid scripting skills in PowerShell and/or Python \nKnowledge of secure Identity Management, authentication principles, and modern access control patterns. \nExperience using security tooling such as EDR, SIEM, SOAR, CASB, etc \nExperience securing workloads running both on-premise (bare-metal / container) and on IaaS platforms. \nFamiliarity with identity lifecycle processes, RBAC, PAM, and privileged identity controls. \nUnderstanding of vulnerability management tools (Nessus/Tenable, RunZero, etc) and secure configuration standards. \nExperience with data protection, DLP, or information protection solutions (e.g., Microsoft Purview, DLP rules, classification/labelling). \nPlease note that we welcome interest from candidates with varying levels of experience; many successful candidates do not meet every single requirement. If you're excited about this role, please apply and allow our recruiters to assess your application. \nWhat you’ll get \nYou’ll join a culture of collaboration and excellence, where you’ll be surrounded by curious thinkers and creative problem solvers. Driven by a passion for continuous improvement, you’ll thrive in a supportive, high-performing environment alongside talented colleagues, working collectively to tackle some of the most complex problems in the financial markets. \nIn return for your expertise, you will have access to a range of Optiver perks, including: \nA performance-based bonus structure unmatched anywhere in the industry. \nThe chance to work alongside diverse and intelligent peers in a rewarding environment. \nTraining, mentorship and personal development opportunities. \nDaily breakfast, lunch and an in-house barista. \nGym membership plus weekly in-house chair massages. \nRegular social events, including a company trip every two years. \nOptiver is committed to diversity and inclusion. We encourage applications from candidates of all backgrounds, and welcome requests for reasonable adjustments during the process. \nQuestions? Get in touch with the recruitment team at .","description_format":"text","description_chars":4736,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Gym membership"],"hiring_locations":[{"name":"Hong Kong","iso":"HK","kind":"country"},{"name":"Singapore","iso":"SG","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Hedge Funds & Alternative Investments"],"lifecycle":[{"event":"open","at":"2026-10-09T14:11:55Z"}],"visa":[],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.3,"p_room":0.28,"age_days":298,"expected_fill_days":56,"reasons":["conf:3","ghost","win:tail","crowd:brand"],"computed_at":"2026-10-12T06:55:09Z"},"pay":null,"html_url":"https://alion.io/job/optiver-senior-information-security-engineer","json_url":"https://alion.io/job/optiver-senior-information-security-engineer.json","meta":{"generated_at":"2026-10-12T13:44:08Z","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":21527,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"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":54501},"rest":"https://alion.io/mcp/rest/get_company?id=54501"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Foptiver-senior-information-security-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%2Foptiver-senior-information-security-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%2Foptiver-senior-information-security-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/optiver-senior-information-security-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Foptiver-senior-information-security-engineer"}]}