Middle Full Stack Node.JS Developer for UBO Team at GR8 Tech. Designing and evolving web platforms focusing on performance, scalability, and reliability.
Responsibilities
Design and evolve backend and frontend architecture using Node.js and JavaScript.
Apply architectural patterns (microservices, event-driven design) based on real constraints.
Design systems with failure in mind, using resilience patterns like circuit breakers and rate limiting.
Build, ship, and maintain backend services and web interfaces in production.
Deliver new features end to end — from requirements to release.
Optimize applications for performance, scalability, and reliability.
Ensure high code quality through reviews, testing, and clean architecture.
Write and maintain unit, integration, and end-to-end tests.
Improve test coverage and reliability of existing systems.
Identify performance bottlenecks and drive optimization initiatives.
Ensure secure coding practices and basic application security.
Partner with product managers, designers, and engineers to deliver business outcomes.
Translate requirements into technical solutions with clear trade-offs.
Contribute to planning, estimation, and iterative delivery in Agile environments.
Share technical context and documentation with the team.
Mentor junior engineers and support technical growth within the team.
Participate in technical discussions and continuous improvement initiatives.
Stay current with modern JavaScript, Node.js, and web development practices.
Requirements
3+ years of commercial experience with Node.js and JavaScript.
Strong knowledge of modern JavaScript (ES12+), async programming, and Node.js internals.
Experience building RESTful APIs with NestJS, Express, Fastify, or similar frameworks.
Solid understanding of web fundamentals: HTTP, browser rendering, SPA architecture.
Experience with SQL databases, basic data modeling, and queries.
Hands-on experience with testing (unit/integration) and CI/CD pipelines.
Comfortable working independently and owning features end to end.
Intermediate or higher level of English, fluent in Ukrainian or Russian.
Experience with Docker and basic Kubernetes concepts.
Familiarity with event-driven systems and message-based architectures.
Exposure to cloud platforms (AWS preferred).
Experience with Webpack, module federation, and bundle optimization.
Monitoring and performance tooling (Prometheus, Grafana, ELK).
Backend Engineer designing APIs and integration architecture for EvenUp's AI - powered legal - tech platform. Improving client portal experiences and application performance from Toronto or San Francisco hubs.
Staff Backend Engineer building search and recommendation systems for Affirm’s pay - over - time marketplace. Setting technical strategy and scaling distributed backend systems across Affirm’s shopping platform.
Senior backend engineer building reliable MySQL and distributed SQL infrastructure for Affirm’s transparent buy - now - pay - later financial products. Automating databases, migrations, networking, and operations at scale.
Senior backend engineer building and operating distributed database infrastructure for Affirm’s buy - now - pay - later platform. Automating provisioning, migrations, failover, and Kubernetes storage networking.
Backend Engineer building Resend’s SMTP and email transport infrastructure. Designing reliable delivery, throttling, routing, and reputation - aware systems for developers.
Salesforce director leading MuleSoft and enterprise data foundation architecture for customer engagements. Advising CxOs and delivering governed, AI - ready platforms across complex technology environments.
Senior Backend Engineer building scalable backend, ETL, and reporting systems for Commerce7, a winery commerce platform. Modernizing legacy databases and powering data - intensive SaaS APIs.
Principal Engineer shaping Xero’s accounting APIs and AI - ready platform. Leading technical strategy for partner integrations, developer tooling, and reliable financial workflows.
Senior Backend Engineer building scalable Java/Kotlin services for Toast’s restaurant reservations and payments platform. Delivering integrations, subscriptions, and guest - management capabilities across global markets.
Staff Backend Engineer improving CI pipelines, automation, and developer productivity at Affirm, a flexible - pay platform. Leading reliable build systems across engineering.