{"id":67970,"url":"https://alion.io/job/roblox-principal-software-engineer-webrtc","title":"Principal Software Engineer, WebRTC","company":{"id":246,"name":"Roblox Corporation","domain":"roblox.com","url":"https://alion.io/company/roblox","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":74,"open_postings":49,"ghost_share":0,"stale_share":0.816,"repost_share":0.02,"time_to_fill_p50_days":62,"computed_at":"2026-11-03T05:54:40Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Mateo, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":295250,"max":345040,"currency":"USD","period":"year","gross":null,"usd_annual":345040},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":true,"relocation_package":false,"has_equity":true,"technologies":[{"name":"C++","optional":false},{"name":"Multimodal AI","optional":false}],"status":"live","first_seen_at":"2026-07-27T18:32:22Z","employer_posted_date":"2026-10-14","last_verified_at":"2026-11-03T23:08:42Z","board_verified":true,"closed_at":null,"days_open":99,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":99},"description":"Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences- all created by our global community of developers and creators. \nAt Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. \nA career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone.\nAs a Principal Software Engineer, Audio-Video-Communication team, you'll be in charge of building our upcoming platform to bring multi-modal communication experience - voice chat, 3D audio, and large-scale broadcast, to our users. If you enjoy working on C++ software while building products for the passionate community of Roblox, you'll be right at home within our experienced and growing social team. You will work with our Engineering Managers and Directors within our Engine's team, and will report to our Manager of the Real-Time Communications team.\nYou Will:\nBuild and launch the latest real-time communication platform from the ground up, designed to support billions of users.\nEmploy best programming practices to write code that is efficient, maintainable, and scalable.\nPlay a crucial role in the introduction of high-quality communication features/products on a wide range of devices, from mobile to high-end platforms.\nEnhance the robustness and performance of existing components\nCollaborate with engineers across engine and partner teams to create synergistic solutions\nYou Have:\nOver 8+ years of experience developing and deploying user-facing software products.\nSuccessfully deployed a high-quality, multi-service distributed system at scale with low costs.\nFamiliarity with the challenges of working at scale and on constrained platforms like consoles or mobile devices.\nExperience in performance optimization (working in Kernel, Assembly, C, and memory management).\nProficiency in C++ and an understanding of parallel/concurrent programming concepts\nA grasp of industry standards, best practices, and design patterns\nApproached problems from multiple perspectives, weighing the advantages and drawbacks of different solutions\nYou Are:\nEnthusiastic about crafting software programming environments for game developers, eager to apply insights from multiple programming ecosystems to our scripting environment\nAble to navigate complex codebases\nDeveloping systems that are not just effective but also resilient over time\nInquisitive, constantly learning and keeping abreast of the latest trends in scripting languages and programming environments\nFor roles that are based at our headquarters in San Mateo, CA: The starting base pay for this position is as shown below. The actual base pay is dependent upon a variety of job-related factors such as professional background, training, work experience, location, business needs and market demand. Therefore, in some circumstances, the actual salary could fall outside of this expected range. This pay range is subject to change and may be modified in the future. All full-time employees are also eligible for equity compensation and for benefits as described on this page.\nAnnual Salary Range\n$295,250—$345,040 USD\nRoles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).\nRoblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process.\nFor US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.","description_format":"text","description_chars":4478,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Mobile Games","Game Development","Metaverse"],"lifecycle":[{"event":"open","at":"2026-07-27T18:32:22Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 247 · green card filings: 82","filings_12m":247,"filings_prev_12m":236,"green_card_filings_12m":82,"median_offered_wage_usd":245038,"route":null,"cap_exempt":false,"checked_at":"2026-10-29T16:27:21+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)","US Department of Labor: PERM disclosure data (green cards)"],"filings_for_role_12m":161}],"liveness":{"score":20,"band":"cold","label":"Long shot","p_open":1,"p_active":0.547,"p_room":0.36,"age_days":98,"expected_fill_days":62,"reasons":["conf:2","stale_co","velocity","win:tail","crowd:brand"],"computed_at":"2026-11-03T05:54:40Z"},"pay":{"stated_usd_annual":345040,"is_top_pay":true},"html_url":"https://alion.io/job/roblox-principal-software-engineer-webrtc","json_url":"https://alion.io/job/roblox-principal-software-engineer-webrtc.json","meta":{"generated_at":"2026-11-04T02:41:05Z","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":4113,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-05T00:00:00Z"}},"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":246},"rest":"https://alion.io/mcp/rest/get_company?id=246"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Froblox-principal-software-engineer-webrtc"},{"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%2Froblox-principal-software-engineer-webrtc"},{"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%2Froblox-principal-software-engineer-webrtc"},{"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/roblox-principal-software-engineer-webrtc\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Froblox-principal-software-engineer-webrtc"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":67970}},{"tool":"search_jobs","arguments":{"company":"roblox.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":67970},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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