{"id":2878,"url":"https://alion.io/job/accellor-senior-mainframe-engineer","title":"Senior Mainframe Engineer","company":{"id":456,"name":"Accellor","domain":"accellor.com","url":"https://alion.io/company/accellor","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"A","score":91,"open_postings":25,"ghost_share":0,"stale_share":0.16,"repost_share":0,"time_to_fill_p50_days":65,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Enterprise Apps","role_family":"Enterprise Apps","seniority":"senior","employment_type":"contractor","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":87000,"max_usd":168000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":238},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ChatGPT","optional":false},{"name":"CICS","optional":false},{"name":"COBOL","optional":false},{"name":"Db2","optional":false},{"name":"JCL","optional":false},{"name":"VSAM","optional":false},{"name":"Abend-AID","optional":true},{"name":"Agile","optional":true},{"name":"Endevor","optional":true},{"name":"File-AID","optional":true}],"status":"live","first_seen_at":"2026-07-01T00:00:00Z","employer_posted_date":"2026-07-01","last_verified_at":"2026-10-16T04:58:58Z","board_verified":true,"closed_at":null,"days_open":107,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":107},"description":"Accellor is an AI-native services firm purpose-built for the post-ChatGPT era. Free from legacy constraints, we focus on delivering measurable business outcomes through advanced AI, data, and engineering capabilities. Our mission is to operationalize AI at scale and unlock sustained enterprise value.\nOur offerings span AI solutions, data services, enterprise applications, and product engineering, tailored to industry-specific needs across healthcare, life sciences, telecom, retail, financial services, and technology. By leveraging design thinking and technology-agnostic architectures, we ensure faster time-to-value and seamless interoperability.\nWith a proven track record of enabling Fortune 100 enterprises and global innovators, Accellor stands as a trusted partner for organizations seeking to harness the full potential of AI. Our vision is clear: to build intelligent, connected ecosystems that deliver measurable outcomes and redefine the future of enterprise transformation.\nWe're looking for an experienced Senior Mainframe Developer to join our team and help build, maintain, and modernize mission-critical applications supporting the financial services industry.\nIf you enjoy solving complex technical challenges, working with large-scale enterprise systems, and delivering reliable, high-performing software, we'd love to hear from you.\nIn this role, you'll collaborate with architects, business stakeholders, and engineering teams to develop and support high-volume transaction processing systems that are essential to daily business operations.\nWhat You'll Do\nDesign, develop, test, and maintain enterprise COBOL applications on IBM Mainframe platforms.\nDevelop and enhance batch and online transaction processing systems.\nAnalyze business and technical requirements to deliver scalable, reliable solutions.\nTroubleshoot production issues and provide ongoing application support.\nOptimize application performance and improve system stability.\nParticipate in code reviews and contribute to development best practices.\nCollaborate with cross-functional teams throughout the software development lifecycle.\nSupport modernization initiatives and integration with newer technologies while maintaining critical legacy systems.\nCreate and maintain technical documentation.\nRequirements\n8+ years of IBM Mainframe development experience.\nStrong hands-on experience with:\nCOBOL\nJCL\nCICS\nDB2\nVSAM\nExperience supporting enterprise-scale production applications.\nStrong analytical and problem-solving skills.\nExperience working within the Software Development Life Cycle (SDLC).\nExcellent communication and collaboration skills.\nPreferred Qualifications\nExperience within the Banking, Financial Services, or Insurance (BFSI) industry.\nKnowledge of financial transaction processing systems.\nExperience with IBM z/OS.\nFamiliarity with tools such as File-AID, Abend-AID, Expeditor, Endevor, or Changeman.\nExperience integrating mainframe applications with distributed systems or APIs.\nExposure to Agile development methodologies.\nExperience supporting modernization or digital transformation initiatives.","description_format":"text","description_chars":3110,"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":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","AI Agents","AI Consulting & Integration"],"lifecycle":[{"event":"open","at":"2026-07-01T00:00:00Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 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