Senior Fullstack Developer

Skyshi Digital Indonesia is a technology company dedicated to delivering innovative digital solutions through software development, product design, and digital transformation services. By combining creativity, technology, and user-centered thinking, we help businesses build impactful digital products that solve real-world problems. At Skyshi, we foster a collaborative, growth-oriented environment where talented individuals are empowered to learn, innovate, and make meaningful contributions. We're hiring! Skyshi Digital Indonesia is looking for a Senior Fullstack Developer to join our growing team.

ROLE SUMMARY:

We are engaging Senior Fullstack Engineers on a three-month contract to accelerate delivery of an enterprise-grade Quick Service Restaurant (QSR) platform — spanning point-of-sale (POS) and backoffice operations, including ERP-level capabilities.

This is a senior-only engagement. We are looking for engineers who can:

• work full-stack across Go backend microservices and a cross-platform POS client;
• become productive in a live, complex codebase with minimal onboarding; and
• operate independently across demanding domains such as order, payment, integration, and inventory.

Ideal candidates bring hands-on context in high-throughput transactional systems, third-party and payment integration, performance optimisation, and offline-first POS.

Key Responsibilities:

• Design, build, and extend features end-to-end across backend services and frontend clients.
• Implement transactional flows (ordering, payment, fulfilment) with reliability patterns — async processing, retries, and idempotency.
• Build offline-first capability for POS: local-first data, store-and-forward sync, and conflict handling.
• Integrate third-party and payment services.
• Improve system performance: query optimisation, caching, and endpoint hardening.
• Contribute to master data, inventory, and reporting capabilities.
• Collaborate through code review and sprint-based delivery.

REQUIREMENTS:

Must Have:

• Go backend microservices — production experience; able to read and extend existing services quickly (hexagonal / clean architecture, gRPC and REST).
• Query & database optimisation — PostgreSQL and MongoDB; indexing, query / explain-plan analysis, N+1 elimination, batching.
• Redis caching — TTL strategy, dedup, cache patterns on hot / high-traffic endpoints.
• Fullstack delivery — proficient in a TypeScript / React (React Native or React web) frontend.
• Third-party integration — payment and/or delivery- aggregator services; async, polling, retry and idempotency patterns.
• Senior autonomy — self-directed in complex domains with minimal onboarding; disciplined Git workflow and code review.

Nice to have:

• AI-assisted development — hands-on with Claude Code or similar agentic coding tools in a real workflow.
• F&B / QSR / POS domain experience.
• Delivery-aggregator integration experience.
• Offline-first / edge patterns: outbox, store-and-forward, conflict resolution, SQLite / embedded stores.
• Event-driven systems with RabbitMQ or similar message brokers.
• MongoDB, OpenTelemetry observability, Kubernetes, React Native + Expo.

Technology Stack:

• Language & runtime Go (backend services); TypeScript (frontend).
• Backend GoFiber (fasthttp); REST and gRPC / Protobuf for internal service-to-service.
• Databases PostgreSQL; MongoDB; SQLite (embedded, offline POS).
• Caching Redis — hot lookups, reservation locks, dedup.
• Messaging RabbitMQ — event-driven processing, outbox pattern.
• Frontend / POS React Native + Expo; react-native-web to Electron desktop POS; TanStack Query; Zustand; shared component library.
• Observability OpenTelemetry; Prometheus; continuous profiling.
• Testing Go unit tests with mocks and containerised integration tests; Playwright (web E2E); Jest.
• Platform & CI/CD Docker; Kubernetes; GitLab CI; database migrations; ULID for offline IDs.