Role Description Workstate is looking for a Senior Full Stack Developer to join our talented team! In this vital role, you will design and develop responsive user interfaces, backend services, APIs, and data-driven applications using modern JavaScript and TypeScript technologies. You will work across the application stack, building engaging React-based user experiences while developing reliable Node.js services and integrating with PostgreSQL databases. If you are passionate about modern web development, clean architecture, and delivering high-quality software, you will thrive at Workstate. We are seeking developers who can engage with and motivate our clients while diving deeply into both frontend and backend development and identifying opportunities for future improvement. Our consultants are quick on their feet and committed to driving quality, collaboration, and innovation. Residents of Colombia or Argentina with the right to work in their country of residence are eligible for this opportunity. Qualifications - 5–7 years of professional software development experience - Proficiency in HTML, CSS, and TypeScript/JavaScript, with extensive experience using React - Strong professional experience developing backend applications and services with Node.js - Experience designing, querying, and optimizing PostgreSQL databases - Experience with Redux Toolkit - Experience with React Query - Experience developing Node.js applications using Koa or similar frameworks - Experience designing, developing, and integrating RESTful APIs - Experience connecting frontend applications with backend services and databases - Experience with frontend build tools and modern application toolchains - Strong understanding of responsive design and frontend performance optimization - Understanding of backend performance, scalability, error handling, and application security - Familiarity with database design, data modeling, migrations, and transactional workflows - Familiarity with version control systems such as Git - Ability to collaborate effectively in an Agile environment and contribute to technical and product discussions - Experience applying UI/UX principles and working closely with designers to create engaging interfaces - Ability to work independently across the stack while coordinating effectively with other developers, designers, product stakeholders, and client teams - B2-level English competency or higher, with the ability to communicate effectively in professional settings, both verbally and in writing Requirements - Experience designing or consuming gRPC services - Experience with Apache Thrift - Experience developing and deploying applications on AWS - Familiarity with cloud-native architectures, containerized applications, and distributed systems - Experience with automated testing across frontend, API, and backend application layers

• Design and implement new features across the stack (Node.js, ReactJS, and React Native), with a strong focus on usability, clarity, and real user value, shaping APIs and GraphQL contracts as part of the feature design process. • Spend the majority of your time in your area of deep expertise, while regularly contributing across the web app, the backend, and the mobile app — picking up features, smaller tasks, and code reviews wherever they're needed. • Build and evolve backend services and APIs (REST and GraphQL) that power our platform. Focus on reliability, maintainability, and clean integrations with frontend applications and third-party services. • Work closely with Product Managers and Designers to translate requirements into practical, well-scoped technical solutions. • Contribute to Engineering Requirement Documents (ERDs) that define data models, API contracts, and integration points before implementation begins. • Write clean, readable, and well-tested code. Participate in code reviews and contribute to shared standards around quality, testing, and maintainability. Improve existing systems where it provides clear product or developer value. • Take responsibility for the features you build. Identify issues or gaps, propose improvements, and iterate based on feedback. You're comfortable working with some ambiguity and adapting as requirements evolve. • Break down product requirements into data models, GraphQL types, and component structure before writing implementation code.

• Develop backend endpoints for the SmartEarn API integration as the primary day-to-day focus. • Test and stage the integration against the VDX sandbox environment. • Implement and monitor purchase and reward status lifecycles, including Pending, Approved, Refunded and Cancelled states. • Calculate reward values using commission-split data. • Implement real-time transaction tracking, reward status management and user notification flows. • Develop and maintain backend APIs and business logic using Node.js and TypeScript. • Periodically support the user-facing rewards interface using React Native. • Contribute to occasional full-stack development work on the Next.js Business Portal. • Design scalable solutions that support reconciliation and idempotent processing of financial and transactional data. • Work autonomously, fill gaps and deliver effectively where formal processes or documentation are limited. • Architect end-to-end product solutions rather than only executing predefined tickets. • Support frequent deployments, typically every one to two days, while maintaining the thoroughness required for financial and transactional logic.

• Design core AdManager features for campaign setup, reporting, and creatives management • Ship complex advertiser-facing initiatives from conception through production • Own initiatives end-to-end with minimal supervision • Translate ambiguous product requirements into clear technical plans • Partner with product managers and engineers to define delivery milestones • Build advertiser-facing interfaces using Next.js, React, and TypeScript • Design scalable APIs, services, and database schemas for advertiser workflows • Maintain backend systems on PostgreSQL that support reporting and campaign data • Apply rigorous testing and code review practices across the codebase • Instrument new features with monitoring, logging, and alerting before launch • Debug and resolve production issues for systems you build • Contribute to incident response and postmortems with clear ownership • Improve codebase conventions and developer experience beyond assigned tickets • Identify better technical solutions for advertiser workflow problems • Challenge weak assumptions with pragmatic, data-backed alternatives • Use AI-assisted development workflows to accelerate delivery • Uphold a high bar for correctness across a shared codebase