#133115 - Senior Full-Stack Engineer - Data-Driven Workflow Applications
Lifted (an Upwork Company) #133115 - Senior Full-Stack Engineer - Data-Driven Workflow Applications
Summary
Senior full-stack engineer building data-driven workflow applications at Lifted (an Upwork company): backend APIs, microservices, and workflow automation in Java or Python plus React/TypeScript frontends on AWS, as an early core engineer on a 40-hour contract running through March 31, 2027.
We are seeking a Senior Full-Stack Engineer to architect and build production web applications that connect data-backed services with intuitive frontend interfaces. The work will enable self-service operational processes, workflow automation, system integrations, and reliable data movement. As an early core engineer, this person will establish software foundations, deliver end-to-end solutions, and help raise engineering standards.
Key Responsibilities
- Architect and build full-stack applications for data-driven operational workflows.
- Develop backend APIs, microservices, workflow orchestration, automated triggers, and system synchronization.
- Build production frontend experiences with React and TypeScript.
- Establish architecture patterns, coding standards, and maintainable engineering practices as an early core team member.
- Lead code reviews, guide peers, and contribute directly to hands-on implementation.
- Diagnose reliability and performance issues across applications, services, integrations, and datastores.
- Deliver measurable improvements to product capability, operational efficiency, or system quality.
Must-Have Skills
- 5+ years of hands-on software development using Java or Python.
- 5+ years building backend services, APIs, or other data-driven applications.
- 5+ years working with datastores such as MySQL, PostgreSQL, MongoDB, or comparable technologies.
- 4+ years building production applications with both React and TypeScript.
- Strong HTML, CSS, and modern JavaScript (ES6+) skills.
- Experience with REST or GraphQL APIs, RPC-style communication, and JSON-based integrations.
- Production cloud experience with a strong focus on AWS.
- Experience leading code reviews and improving software quality.
- Evidence of tangible impact from personally delivered engineering work.
- A technical bachelor's degree.
- Ability to operate as an early core engineer by shaping architecture, establishing coding standards, and guiding peers while remaining hands-on.
Nice-to-Have Skills
- Billing-system experience.
- Service-oriented or event-driven architecture experience.
- Frontend GraphQL experience, including Apollo or comparable tooling.
- Experience with Kafka, Amazon SQS, RabbitMQ, or comparable messaging systems.
- Design-system or reusable component-library experience.
- Jest and React Testing Library experience.
- Webpack or Vite experience.
- Web accessibility experience, including WCAG.
- Strong production debugging and troubleshooting experience.
- Experience with large-scale or high-performance systems, including consistency, scalability, replication, or redundancy concerns.
- Enterprise experience strongly preferred.
Required Tools and Platforms
- Java or Python.
- React and TypeScript.
- HTML, CSS, and modern JavaScript.
- REST or GraphQL, RPC, and JSON.
- AWS.
- MySQL, PostgreSQL, MongoDB, or comparable datastores.
Location Time and Engagement
- Candidates must be based in LATAM.
- Full US Central Time coverage is required.
- This is a contract engagement at 40 hours per week.
- The anticipated engagement runs through March 31, 2027.
- This is not currently a contract-to-hire opportunity.