{"id":2197463,"url":"https://alion.io/job/trueml-senior-software-engineer-performance","title":"Senior Software Engineer (Performance)","company":{"id":7362,"name":"TrueML","domain":"trueml.co","url":"https://alion.io/company/trueml","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Argentina","Mexico","Costa Rica","Dominican Republic"],"countries":["AR","MX","CR","DO"],"hiring_countries":["MX"],"hiring_countries_total":1,"salary":{"min":50000,"max":78000,"currency":"USD","period":"year","gross":null,"usd_annual":78000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Python","optional":false},{"name":"Scala","optional":false},{"name":"AWS","optional":true},{"name":"CI/CD","optional":true},{"name":"GCP","optional":true}],"status":"live","first_seen_at":"2026-10-07T23:07:07Z","employer_posted_date":"2026-10-07","last_verified_at":"2026-10-12T05:46:15Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"About the Team\nThe Legacy Performance Improvement team builds and maintains the systems that keep our business running. Much of our work centers on legacy platforms that power some of the company's highest-revenue projects, which means our work is visible across the organization and carries real impact. We modernize, stabilize, and extend critical systems while keeping them reliable for the teams who depend on them every day.\nAbout the Role\nWe're looking for a senior engineer who is excited by the challenge of working on mature, business-critical systems and shaping how they evolve. You'll work on high-revenue, high-visibility projects, contribute to architectural decisions, mentor other engineers, and partner with stakeholders across the company to deliver tools that matter.\nWork-Life Benefits\nUnlimited PTO\nMedical benefit contributions in congruence with local laws and type of employment agreement\nWhat You'll Do:\nDesign, build, and maintain internal tools and services, primarily within legacy systems\n\nContribute to architectural decisions, including how to incrementally modernize and improve existing platforms\n\nDeliver on high-revenue projects where reliability, correctness, and performance are essential\n\nCollaborate with stakeholders across engineering and the business to understand needs and communicate progress\n\nImprove the maintainability, testing, and observability of existing codebases\n\nWrite clear technical documentation and share knowledge with the team\n\nParticipate in code reviews, mentor less-experienced engineers, and help raise the 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