{"id":494823,"url":"https://alion.io/job/blockstream-rust-simplicity-maintainer","title":"Rust-Simplicity Maintainer","company":{"id":1221,"name":"Blockstream","domain":"blockstream.com","url":"https://alion.io/company/blockstream","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":91,"open_postings":43,"ghost_share":0.07,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":136,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"junior","employment_type":"full_time","work_mode":"remote","remote_scope":"unspecified","remote_scope_basis":"board_flag_no_place","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":2,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Bitcoin","optional":false},{"name":"CI/CD","optional":false},{"name":"GitHub","optional":false},{"name":"Rust","optional":false},{"name":"Haskell","optional":true}],"status":"live","first_seen_at":"2025-09-19T17:47:43Z","employer_posted_date":"2025-09-19","last_verified_at":"2026-10-17T19:31:16Z","board_verified":true,"closed_at":null,"days_open":393,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":392},"description":"Blockstream was founded in 2014 by Dr. Adam Back and a group of fellow cryptographers and engineers who are passionate about Bitcoin and its potential to change the world. Today, Blockstream is the leading Bitcoin company, providing cutting-edge infrastructure solutions for enterprises, institutions, and individual Bitcoin users. We develop industry-leading Bitcoin self-custody solutions, Bitcoin-based financial products, second-layer scaling technologies, and enterprise-grade blockchain infrastructure.\nAs Rust-Simplicity Maintainer, you will be the primary steward of Blockstream’s Rust-based Simplicity implementation and associated libraries. These libraries include rust-simplicity, SimplicityHL, hal-simplicity, rust-elements, and elements-miniscript, all of which need to work together performantly, coherently and in sync with the wider Simplicity project.\nThis role includes architecture, implementation, review and maintenance of these libraries, which are written and Rust and cover creation, analysis and wallet integration of the Simplicity blockchain language.\nWhat You’ll Be Doing (Responsibilities):\nCore Ownership: Maintain the Rust implementation of Simplicity, expanding it to cover new use-cases and improving our CI and QA processes.\n\nMulti-Repo Maintenance: The Simplicity integration covers multiple crates, including rust-simplicity, SimplicityHL, hal-simplicity, rust-elements, and elements-miniscript.\n\nCode Review & Quality Assurance: Provide at least one additional maintainer-level code review for each repository to ensure that nothing merges without at least one signoff independent of the author.\n\nContinuous Integration: Maintain and improve CI pipelines to ensure robust, automated testing and quick feedback on code changes.\n\nEcosystem Integration: Collaborate with other teams to integrate Simplicity into Bitcoin-related projects, such as Elements and Liquid.\n\nCommunity Engagement: Review pull requests, manage GitHub issues, and guide open-source contributors across all maintained projects.\n\nDocumentation: Maintain clear, developer-friendly documentation for internal and external audiences.\n\nWhat We Look For In You (Required Qualifications):\nStrong proficiency in Rust (2+ years professional experience preferred).\n\nFamiliarity with Bitcoin, blockchain protocols, or cryptographic systems.\n\nStrong written communication skills and ability to work in a globally distributed team.\n\nNice To Haves (Preferred Qualifications):\nProven track record of maintaining or leading open-source projects.\n\nKnowledge of formal methods, theorem provers, or functional languages like Haskell.\n\nUnderstanding of Simplicity’s design goals and architecture.\n\nExperience with blockchain virtual machines, scripting systems, or transaction policy tools like Miniscript.\n\nPrior contributions to Bitcoin Core, Elements, or related protocol implementations.\n\nStay Safe from Job Scams\nAll official Blockstream communication will come from an @blockstream.com email address. We will never ask you to share sensitive information or purchase equipment during the hiring process. If in doubt, contact us at . Learn more about avoiding job scams here.","description_format":"text","description_chars":3185,"description_truncated":false,"requirements":{"experience_years_min":2,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Cryptocurrencies","Blockchain Infrastructure","Crypto Wallets"],"lifecycle":[{"event":"open","at":"2026-09-07T03:23:07Z"},{"event":"open","at":"2026-09-26T06:14:31Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 1","filings_12m":1,"filings_prev_12m":1,"green_card_filings_12m":0,"median_offered_wage_usd":152500,"route":null,"cap_exempt":false,"checked_at":"2026-10-15T11:24:14+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)"],"filings_for_role_12m":0}],"liveness":{"score":9,"band":"cold","label":"Long shot","p_open":1,"p_active":0.322,"p_room":0.28,"age_days":392,"expected_fill_days":136,"reasons":["conf:2","win:tail","crowd:junior"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/blockstream-rust-simplicity-maintainer","json_url":"https://alion.io/job/blockstream-rust-simplicity-maintainer.json","meta":{"generated_at":"2026-10-17T22:24:10Z","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":289,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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":1221},"rest":"https://alion.io/mcp/rest/get_company?id=1221"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fblockstream-rust-simplicity-maintainer"},{"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%2Fblockstream-rust-simplicity-maintainer"},{"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%2Fblockstream-rust-simplicity-maintainer"},{"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/blockstream-rust-simplicity-maintainer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fblockstream-rust-simplicity-maintainer"}]}