Upwork

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
<ul>
<li>Architect and build full-stack applications for data-driven operational workflows.</li>
<li>Develop backend APIs, microservices, workflow orchestration, automated triggers, and system synchronization.</li>
<li>Build production frontend experiences with React and TypeScript.</li>
<li>Establish architecture patterns, coding standards, and maintainable engineering practices as an early core team member.</li>
<li>Lead code reviews, guide peers, and contribute directly to hands-on implementation.</li>
<li>Diagnose reliability and performance issues across applications, services, integrations, and datastores.</li>
<li>Deliver measurable improvements to product capability, operational efficiency, or system quality.</li>
</ul>
Qualifications
Must-Have Skills
<ul>
<li>5+ years of hands-on software development using Java or Python.</li>
<li>5+ years building backend services, APIs, or other data-driven applications.</li>
<li>5+ years working with datastores such as MySQL, PostgreSQL, MongoDB, or comparable technologies.</li>
<li>4+ years building production applications with both React and TypeScript.</li>
<li>Strong HTML, CSS, and modern JavaScript (ES6+) skills.</li>
<li>Experience with REST or GraphQL APIs, RPC-style communication, and JSON-based integrations.</li>
<li>Production cloud experience with a strong focus on AWS.</li>
<li>Experience leading code reviews and improving software quality.</li>
<li>Evidence of tangible impact from personally delivered engineering work.</li>
<li>A technical bachelor's degree.</li>
<li>Ability to operate as an early core engineer by shaping architecture, establishing coding standards, and guiding peers while remaining hands-on.</li>
</ul>
Nice-to-Have Skills
<ul>
<li>Billing-system experience.</li>
<li>Service-oriented or event-driven architecture experience.</li>
<li>Frontend GraphQL experience, including Apollo or comparable tooling.</li>
<li>Experience with Kafka, Amazon SQS, RabbitMQ, or comparable messaging systems.</li>
<li>Design-system or reusable component-library experience.</li>
<li>Jest and React Testing Library experience.</li>
<li>Webpack or Vite experience.</li>
<li>Web accessibility experience, including WCAG.</li>
<li>Strong production debugging and troubleshooting experience.</li>
<li>Experience with large-scale or high-performance systems, including consistency, scalability, replication, or redundancy concerns.</li>
<li>Enterprise experience strongly preferred.</li>
</ul>
Additional Information
Required Tools and Platforms
<ul>
<li>Java or Python.</li>
<li>React and TypeScript.</li>
<li>HTML, CSS, and modern JavaScript.</li>
<li>REST or GraphQL, RPC, and JSON.</li>
<li>AWS.</li>
<li>MySQL, PostgreSQL, MongoDB, or comparable datastores.</li>
</ul>
Location Time and Engagement
<ul>
<li>Candidates must be based in LATAM.</li>
<li>Full US Central Time coverage is required.</li>
<li>This is a contract engagement at 40 hours per week.</li>
<li>The anticipated engagement runs through March 31, 2027.</li>
<li>This is not currently a contract-to-hire opportunity.</li>
</ul>

#133115 - Senior Full-Stack Engineer - Data-Driven Workflow Applications

#133115 - Senior Full-Stack Engineer - Data-Driven Workflow Applications

This job is no longer available

Talents

Recruiters

About