{"company":{"id":7349,"name":"Jane Street","domain":"janestreet.com","url":"https://alion.io/company/jane-street"},"answer":"Jane Street builds mostly with Python, OCaml, PowerShell, Bash. Its stack also includes Linux, Windows, NCCL, PyTorch. Python is named in 19 of the 55 job postings Jane Street published in the last 12 months (35%). Counted by Alion from the job postings of Jane Street, updated Sep 29, 2026.","window_days":365,"postings_analysed":55,"open_postings":53,"technologies_in_use":44,"modernity_score":68,"ai_adoption":true,"technologies":[{"name":"Python","layer":"languages","postings":19,"share":0.3455,"required":19,"open_postings":19,"first_seen":"2019-05-02","last_seen":"2026-09-09","median_stated_pay_usd":null},{"name":"OCaml","layer":"languages","postings":15,"share":0.2727,"required":15,"open_postings":15,"first_seen":"2019-05-02","last_seen":"2026-09-01","median_stated_pay_usd":null},{"name":"Machine Learning","layer":"practices","postings":13,"share":0.2364,"required":13,"open_postings":11,"first_seen":"2022-11-18","last_seen":"2026-09-09","median_stated_pay_usd":null},{"name":"Microsoft Excel","layer":"tools","postings":9,"share":0.1636,"required":9,"open_postings":9,"first_seen":"2026-06-08","last_seen":"2026-09-28","median_stated_pay_usd":null},{"name":"PowerShell","layer":"languages","postings":9,"share":0.1636,"required":9,"open_postings":9,"first_seen":"2025-04-18","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"Linux","layer":"cloud","postings":7,"share":0.1273,"required":7,"open_postings":7,"first_seen":"2019-09-13","last_seen":"2026-08-03","median_stated_pay_usd":null},{"name":"Windows","layer":"cloud","postings":7,"share":0.1273,"required":7,"open_postings":7,"first_seen":"2025-06-23","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"AI Agents","layer":"practices","postings":5,"share":0.0909,"required":5,"open_postings":5,"first_seen":"2026-06-03","last_seen":"2026-06-11","median_stated_pay_usd":null},{"name":"Bash","layer":"languages","postings":4,"share":0.0727,"required":4,"open_postings":4,"first_seen":"2021-01-08","last_seen":"2026-07-29","median_stated_pay_usd":null},{"name":"C++","layer":"languages","postings":4,"share":0.0727,"required":4,"open_postings":4,"first_seen":"2022-07-06","last_seen":"2026-04-30","median_stated_pay_usd":null},{"name":"Haskell","layer":"languages","postings":4,"share":0.0727,"required":4,"open_postings":4,"first_seen":"2025-10-29","last_seen":"2026-04-30","median_stated_pay_usd":null},{"name":"BGP","layer":"practices","postings":3,"share":0.0545,"required":3,"open_postings":3,"first_seen":"2019-09-13","last_seen":"2026-08-20","median_stated_pay_usd":null},{"name":"OSPF","layer":"practices","postings":3,"share":0.0545,"required":3,"open_postings":3,"first_seen":"2019-09-13","last_seen":"2026-08-20","median_stated_pay_usd":null},{"name":"Recommender Systems","layer":"practices","postings":3,"share":0.0545,"required":3,"open_postings":3,"first_seen":"2026-06-03","last_seen":"2026-06-04","median_stated_pay_usd":null},{"name":"Time Series Forecasting","layer":"practices","postings":3,"share":0.0545,"required":3,"open_postings":3,"first_seen":"2026-06-02","last_seen":"2026-09-09","median_stated_pay_usd":null},{"name":".NET","layer":"cloud","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2026-07-21","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"C#","layer":"languages","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2022-07-06","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"CI/CD","layer":"practices","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2026-07-21","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"F#","layer":"languages","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2026-07-21","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"Formal Verification","layer":"tools","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2025-10-29","last_seen":"2025-10-29","median_stated_pay_usd":null},{"name":"Java","layer":"languages","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2022-07-06","last_seen":"2025-10-29","median_stated_pay_usd":null},{"name":"Prompt Engineering","layer":"practices","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2026-07-21","last_seen":"2026-08-27","median_stated_pay_usd":null},{"name":"Verilog","layer":"languages","postings":2,"share":0.0364,"required":2,"open_postings":2,"first_seen":"2026-07-24","last_seen":"2026-08-03","median_stated_pay_usd":null},{"name":"AutoCAD","layer":"tools","postings":2,"share":0.0364,"required":1,"open_postings":2,"first_seen":"2026-03-03","last_seen":"2026-09-24","median_stated_pay_usd":null},{"name":"ChatGPT","layer":"ai","postings":2,"share":0.0364,"required":0,"open_postings":2,"first_seen":"2026-05-21","last_seen":"2026-09-02","median_stated_pay_usd":null},{"name":"Chisel","layer":"languages","postings":2,"share":0.0364,"required":0,"open_postings":2,"first_seen":"2026-07-24","last_seen":"2026-08-03","median_stated_pay_usd":null},{"name":"Tableau","layer":"cloud","postings":2,"share":0.0364,"required":0,"open_postings":2,"first_seen":"2026-05-21","last_seen":"2026-09-02","median_stated_pay_usd":null},{"name":"VHDL","layer":"languages","postings":2,"share":0.0364,"required":0,"open_postings":2,"first_seen":"2026-07-24","last_seen":"2026-08-03","median_stated_pay_usd":null},{"name":"Xilinx Vivado","layer":"tools","postings":2,"share":0.0364,"required":0,"open_postings":2,"first_seen":"2026-07-24","last_seen":"2026-08-03","median_stated_pay_usd":null},{"name":"Active Directory","layer":"cloud","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2025-06-23","last_seen":"2026-07-29","median_stated_pay_usd":null},{"name":"Adobe Photoshop","layer":"tools","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2026-08-24","last_seen":"2026-08-24","median_stated_pay_usd":null},{"name":"CUDA Toolkit","layer":"cloud","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2024-05-20","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"Human-in-the-Loop","layer":"practices","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2026-06-17","last_seen":"2026-06-17","median_stated_pay_usd":null},{"name":"InfiniBand","layer":"tools","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2022-07-06","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"Layer 2","layer":"practices","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2021-01-08","last_seen":"2026-03-27","median_stated_pay_usd":null},{"name":"NCCL","layer":"frameworks","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2024-05-20","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"NVLink","layer":"tools","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2024-05-20","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"PKI","layer":"practices","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2025-09-05","last_seen":"2025-10-23","median_stated_pay_usd":null},{"name":"PyTorch","layer":"frameworks","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2022-11-18","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"Qualys Cloud Platform","layer":"cloud","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2026-06-17","last_seen":"2026-06-17","median_stated_pay_usd":null},{"name":"SQL","layer":"languages","postings":1,"share":0.0182,"required":1,"open_postings":1,"first_seen":"2022-05-03","last_seen":"2026-07-14","median_stated_pay_usd":null},{"name":"Sass","layer":"languages","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2024-05-20","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"TensorFlow","layer":"frameworks","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2022-11-18","last_seen":"2026-07-30","median_stated_pay_usd":null},{"name":"cuDNN","layer":"frameworks","postings":1,"share":0.0182,"required":1,"open_postings":0,"first_seen":"2024-05-20","last_seen":"2026-07-30","median_stated_pay_usd":null}],"own_products":[],"changes":{"first_appeared":[{"name":"Verilog","first_seen":"2026-07-24"},{"name":"Chisel","first_seen":"2026-07-24"},{"name":"VHDL","first_seen":"2026-07-24"},{"name":"Xilinx Vivado","first_seen":"2026-07-24"},{"name":".NET","first_seen":"2026-07-21"},{"name":"CI/CD","first_seen":"2026-07-21"},{"name":"F#","first_seen":"2026-07-21"},{"name":"Prompt Engineering","first_seen":"2026-07-21"}],"rising":[{"name":"PowerShell","share_from":0,"share_to":19},{"name":"Linux","share_from":0,"share_to":19},{"name":"Windows","share_from":0,"share_to":16},{"name":"Bash","share_from":0,"share_to":10}],"falling":[{"name":"AI Agents","share_from":36,"share_to":0},{"name":"Recommender Systems","share_from":21,"share_to":0},{"name":"Python","share_from":43,"share_to":26},{"name":"Microsoft Excel","share_from":29,"share_to":16}],"not_seen_180d":[{"name":"Formal Verification","last_seen":"2025-10-29"},{"name":"Java","last_seen":"2025-10-29"}]},"similar_stacks":[{"name":"Jump Trading","url":"https://alion.io/company/jump-trading/technologies","shared_technologies":33},{"name":"Tower Research Capital","url":"https://alion.io/company/tower-research-capital/technologies","shared_technologies":36},{"name":"TD SYNNEX","url":"https://alion.io/company/td-synnex/technologies","shared_technologies":30},{"name":"ExxonMobil","url":"https://alion.io/company/exxonmobil/technologies","shared_technologies":35},{"name":"Graphcore","url":"https://alion.io/company/graphcore/technologies","shared_technologies":37},{"name":"Dell Technologies","url":"https://alion.io/company/dell-technologies/technologies","shared_technologies":43},{"name":"Starfish Holdings","url":"https://alion.io/company/starfish/technologies","shared_technologies":33},{"name":"xAI","url":"https://alion.io/company/xai/technologies","shared_technologies":40}],"html_url":"https://alion.io/company/jane-street/technologies","json_url":"https://alion.io/company/jane-street/technologies.json","license":"CC BY-SA 4.0","meta":{"source":"Alion","built_at":"2026-09-29T00:46:03Z","generated_at":"2026-09-29T06:52:38Z"}}