Senior Lead Fullstack Engineer

Top 3 Reasons To Join Us Top-notch Annual Income Modern Office & Perks Unlimited Growth Opportunities The Job Cobalt Streamworks is a high-growth technology-driven e-commerce business. As a start-up formed in 2020, we have created a fast-paced and dynamic environment, enabling our people to reach a cumulative average growth rate of over 1000% in the last 5 years. We're forming an elite Fullstack squad that operates differently, working with AI-driven products . No "that's not my ticket" culture. Each engineer owns a feature end-to-end - from data model to UI pixel - and thinks like a Product Owner when scoping, like a Solutions Architect when designing, and like a craftsman when coding. If you want to work with people like that and become like them, this is the next step. What you'll do Feature ownership Take a feature from kick-off to production: data model, API design, service layer, UI. Own reliability, performance, and observability of what you ship - not just the happy path. Turn product goals into concrete technical specs. System design & architecture Design full-stack architectures: databases, APIs, queues, caches, frontend rendering strategies. Apply patterns (Clean Architecture, Event - Driven, etc) where they fit the problem. Write design docs and lead technical discussions. Backend Build well-tested APIs and microservices in Node.js, Go, or Python - whichever fits. Design and optimize relational and non-relational databases. Work with event streaming. Frontend Build fast, accessible, SEO-friendly storefronts with React / Next.js (SSR/CSR as appropriate). Optimize Core Web Vitals, bundle size, lazy loading, and CDN strategy (Cloudflare, AWS S3). Write maintainable state management (Redux, Zustand, Recoil). Code quality & collaboration Write clean, tested, well-structured code; review teammates' code. Treat unit/integration/e2e testing and CI/CD as standard practice. Work with Product and Design to shape requirements, not just receive them. Support junior engineers Your Skills and Experience Education & Experience Education: Strong academic background in Computer Science, Engineering,... 5+ years of professional engineering with real fullstack work. We value T-shaped engineers who have a clear spike (deep expertise) in either Frontend or Backend, but possess the full-stack capability to own and ship a feature end-to-end when needed 2+ years building products at a product company, fast-growing tech startup, or environments demanding strong product-led delivery. Built or joined at least one system from scratch: schema, API, service, and UI. Technical Depth & Domain Knowledge We don't gate-keep on language, but you should understand the why behind your choices. Must have at least one stack in depth: TypeScript / JavaScript: Node.js, React, Next.js (SSR, API routes, state management), Node / Go / Java: backend services, goroutines, clean service architecture Python: API backends, scripting, data-adjacent services LLM / AI integration in production features Databases (required): Relational design: normalization, indexing, query optimization, transactions (PostgreSQL preferred) At least one NoSQL store in production (Redis, MongoDB, Elasticsearch) Able to diagnose and fix a slow query System-level: Async systems: queues, events, background workers Judgment on when caching helps vs. when it creates problems Monolith and Microservice trade offs Nice to have: eCommerce: checkout flows, inventory, pricing engines, ad integrations Docker, Kubernetes basics, CI/CD pipeline ownership Why You'll Love Working Here Ownership: Direct ownership of real work streams from day 1 with a clear trajectory toward product leadership roles. AI Implementation: Hands-on experience deploying cutting-edge AI solutions to solve high-scale business problems. High-performance Team: Work with a data-driven team that values autonomy, speed, and outcomes. Compensation: Competitive total compensation package (13 months guarantee + attractive bonus). Health & Leave: 15 paid leave days + global health insurance. Learning Budget: Dedicated L&D budget to support your professional development.