Mercor is partnering with a **frontier AI research lab** to engage experienced software engineers with deep expertise in **legacy codebase migration and modernisation**. We are looking for engineers who have personally executed complex migrations across **large, production-grade systems**, particularly in **financial services, fintech/payments, insurance, healthcare, telecom, large technology companies, and other mission-critical enterprises**. Strong hands-on experience with production migrations is the primary qualification. ## What You'll Do - Design, implement, review, and evaluate complex **codebase migration and modernisation tasks**. - Analyse legacy code, dependencies, APIs, databases, build systems, and infrastructure to determine safe migration approaches. - Preserve **functionality, backwards compatibility, data integrity, security, and performance** during migrations. - Develop tests and validation strategies to identify migration regressions and behavioural differences. - Evaluate AI-generated migration solutions for **correctness, completeness, maintainability, and production readiness**. ## Relevant Migration Experience Candidates should have deep expertise in **one or more** of the following: - **Language/version:** Java 8 → 17/21, legacy .NET → modern .NET, Python 2 → 3, PHP 7 → 8 - **Language rewrites:** COBOL → Java/Python, JavaScript → TypeScript - **Frameworks:** Angular, Rails, Django, Spring/Spring Boot, , Next.js/Astro, and other major framework upgrades/replacements - **Databases & ORMs:** Oracle/MySQL → PostgreSQL, SQL → NoSQL, Hibernate → jOOQ, Sequelize → Prisma, raw SQL → ORM - **Infrastructure:** VMs/bare metal → containers, Docker/Kubernetes, cloud-native architectures - **CI/CD:** Jenkins/Travis → GitHub Actions, GitLab CI, or modern deployment pipelines - **Build/package tooling:** Maven → Gradle, Webpack → Vite, CRA → Next.js, npm → pnpm - **APIs:** REST → GraphQL, HTTP/REST → gRPC, SOAP/legacy APIs → modern interfaces - **Authentication:** Legacy auth → OAuth/OIDC, SAML/SSO, modern identity and authorisation systems - **Repositories:** Polyrepo → monorepo using Bazel, Nx, Turborepo, or similar - **Testing:** Migration of unit, integration, browser, and E2E testing frameworks - **Dependencies/SDKs:** Replacement of deprecated or EOL libraries, APIs, runtimes, and vendor SDKs ## Ideal Background - **5+ years of professional software engineering experience**, ideally Senior, Staff, Principal, or equivalent. - Personally owned or made substantial technical contributions to **large-scale production migrations**. - Experience working with mature systems involving technical debt, complex dependencies, legacy integrations, and significant regression risk. - Strong knowledge of **compatibility, testing, observability, staged rollouts, rollback strategies, and behavioural equivalence**. - Ability to reason deeply about unfamiliar codebases and diagnose subtle migration failures. - **Especially valuable:** engineers who have modernised **core banking, payments, trading, insurance, healthcare, telecom, or other high-reliability systems**. - For **COBOL/mainframe modernisation, experience with technologies such as z/OS, CICS, JCL, DB2, VSAM, batch processing, and COBOL-to-Java/Python migrations** is particularly valuable. ## Why Join - Apply your migration expertise to help shape how **frontier AI models understand and execute complex software modernisation**. - Work on technically challenging problems modelled after **real-world, production-scale legacy systems**. - Contribute expertise developed from large enterprise migrations without needing an open-source maintainer background. - Opportunity for **ongoing work** as the research program expands.
Remote Legacy Codebase Migration Expert - AI Trainer ($200-$200 per hour) • Kansas City, Missouri, US
Join our team as a Remote Data Entry Specialist, where you will adhere to safety guidelines and company policies, learn company products and services to better assist others, and handle orders, shi... Show more
We are urgently looking for people interested in taking online surveys for Fortune 500 brands.If you are a self-starter, looking for flexible hours throughout the week, this may be for you! Earn up... Show more
We are urgently looking for people interested in taking online surveys for Fortune 500 brands.If you are a self-starter, looking for flexible hours throughout the week, this may be for you! Earn up... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
We are urgently looking for people interested in taking online surveys for Fortune 500 brands.If you are a self-starter, looking for flexible hours throughout the week, this may be for you! Earn up... Show more
An exciting opportunity awaits for a Remote Data Entry Specialist to follow safety procedures and company policies, assist with processing returns and exchanges, and work collaboratively across tea... Show more
Review and label digital content including text, images, and documents.Every task you complete helps improve how technology interprets information and performs in practical settings.Detail-oriented... Show more
We are urgently looking for people interested in taking online surveys for Fortune 500 brands.If you are a self-starter, looking for flexible hours throughout the week, this may be for you! Earn up... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
Surrogacy Opportunity Starts at 60K-75K+ with a $1,250 Pre-Screening Bonus.Your surrogacy journey could help build the family someone's been dreaming of and whether you're a stay-at-home mom or w... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
As a Remote Records Processor, you will be responsible for inputting and maintaining data accurately from home, including: input data accurately into company systems from home.Duties and responsibi... Show more
Help us succeed as our next Costco Data Entry Clerk (Remote) to maintain accurate records and documentation, assist with organizing, stocking, and general upkeep, and assist with processing returns... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
AI data lab for training frontier models and evaluating AI agents.Experts contribute their diverse subject matter knowledge across domains such as finance, healthcare, STEM engineering, and more.AI... Show more
Are you passionate about the patient experience? At HCA Healthcare, we are committed to caring for patients with purpose and integrity.We care like family! Jump-start your career as a MRI Technolog... Show more
Product Testers are wanted to work from home in the UK to fulfill upcoming contracts with local and international companies.We guarantee 15-25 hours per week with an hourly pay of between £18/hr.Th... Show more
Surrogacy Opportunity Starts at 60K-75K+ with a $1,250 Pre-Screening Bonus.Your surrogacy journey could help build the family someone's been dreaming of and whether you're a stay-at-home mom or w... Show more
Product Testers are wanted to work from home nationwide in the US to fulfill upcoming contracts with national and international companies.We guarantee 15-25 hours per week with an hourly pay of bet... Show more
