{"id":2355633,"url":"https://alion.io/job/mactores-java-engineer-application-database-modernization-freelancer","title":"Java Engineer – Application / Database Modernization (Freelancer)","company":{"id":6938,"name":"Mactores","domain":"mactores.com","url":"https://alion.io/company/mactores","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"D","score":54,"open_postings":31,"ghost_share":0.677,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":84,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Backend","role_family":"Backend","seniority":"middle","employment_type":"freelance","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Mumbai, India"],"countries":["IN"],"hiring_countries":["IN"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":15000,"max_usd":36000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":10},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Db2","optional":false},{"name":"Hibernate","optional":false},{"name":"Java","optional":false},{"name":"Oracle","optional":false},{"name":"PostgreSQL","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-01-07T12:17:34Z","employer_posted_date":"2026-01-07","last_verified_at":"2026-10-12T23:10:50Z","board_verified":true,"closed_at":null,"days_open":278,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":278},"description":"Mactores is looking for a Software Engineer with proficiency in Java, Spring, and Hibernate to participate in the migration project from Oracle to PostgreSQL. The ideal candidate should possess a robust understanding of Java, Spring, and Hibernate, with hands-on experience in developing large-scale Java web applications.\nWhat you will do?\nAnalyze and remediate large enterprise Java codebases to replace legacy or database-specific SQL constructs with modern, standards-compliant SQL.\nConvert embedded SQL within Java services and MyBatis XML mappers, including rewriting constructs such as vendor-specific functions, sequences, pagination logic, dynamic SQL, and error-handling patterns.\nCollaborate closely with schema and database migration engineers to ensure application-layer SQL aligns with the modernized target schema.\nRefactor Java transaction logic, error-handling, drivers, and ORM/DAO layers to support the behavior of modern databases.\nParticipate in unit, integration, and performance testing to confirm functional parity and ensure applications meet performance SLAs post-modernization.\nSupport application cutover activities for production environments, including validation, monitoring setup, rollback planning, and stabilization.\nProduce engineering documentation: SQL remediation guides, code-migration runbooks, troubleshooting guides, and knowledge-transfer material for customer teams.\nWork across distributed teams (US & India) and collaborate with customer SMEs to ensure business logic alignment and successful modernization outcomes.\nWhat are we looking for?\nBachelor’s degree in Computer Science, Engineering, or related field.\n3+ years of professional Java development experience (Spring, JDBC, MyBatis/Hibernate or equivalent).\nExperience with application modernization, database migrations, or large-scale refactoring initiatives.\nStrong SQL expertise and the ability to analyze, interpret, optimize, and rewrite complex SQL used within Java applications.\nDeep understanding of JDBC, ORMs, Java transaction patterns, and database-driven application flows.\nExperience working on enterprise-grade, high-performance applications with complex data interactions.\nStrong communication skills and ability to work with global distributed teams in US time-zones.\nYou will be preferred if\nExperience with PostgreSQL, Aurora PostgreSQL, or modernization from legacy databases such as Oracle, SQL Server, or DB2.\nExposure to automated code-refactoring tools or GenAI-assisted remediation workflows.\nFamiliarity with CI/CD environments, performance testing tools, and observability stacks.\nConsulting or professional services experience delivering fixed-timeline modernization projects.","description_format":"text","description_chars":2706,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"India","iso":"IN","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Cloud Consulting & Migration","Data Engineering & Migration Services"],"lifecycle":[{"event":"open","at":"2026-10-12T14:43:45Z"}],"visa":[],"liveness":{"score":14,"band":"cold","label":"Long shot","p_open":1,"p_active":0.485,"p_room":0.28,"age_days":278,"expected_fill_days":84,"reasons":["conf:2","win:tail","crowd:"],"computed_at":"2026-10-13T01:50:37Z"},"pay":null,"html_url":"https://alion.io/job/mactores-java-engineer-application-database-modernization-freelancer","json_url":"https://alion.io/job/mactores-java-engineer-application-database-modernization-freelancer.json","meta":{"generated_at":"2026-10-13T01:50:37Z","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":2648,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"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":6938},"rest":"https://alion.io/mcp/rest/get_company?id=6938"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmactores-java-engineer-application-database-modernization-freelancer"},{"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%2Fmactores-java-engineer-application-database-modernization-freelancer"},{"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%2Fmactores-java-engineer-application-database-modernization-freelancer"},{"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/mactores-java-engineer-application-database-modernization-freelancer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmactores-java-engineer-application-database-modernization-freelancer"}]}