EXPANDO Senior Backend Developer (Node.js / TypeScript) Práce vzdáleně Full-time

EXPANDO

Moravskoslezský kraj
Trvalý pracovní poměr
Plný úvazek

Před 2 měsíci

We're looking for a strong Senior Backend Engineer with 5+ years of experience in Node.js and TypeScript who enjoys working on complex, high-volume backend systems - and who sees AI as a natural part of modern engineering work. This role is not about management, product ownership, or becoming a CTO. It's about being exceptionally good at backend engineering in a large, real-world system used by hundreds of e-shops across Europe - and using the best tools available (including AI) to do it better.High-Volume, High-Efficiency Data EngineeringWhat You'll Actually Be Working With

Large-scale product and order synchronization pipelines
High-volume API request balancing
Throttling-aware integration logic
Data flow optimization and prioritization strategies
Performance tuning in a system that has evolved for 10 years
Improving reliability without rewriting everything from scratch
Using AI tools to reason about complex flows, explore optimizations, and accelerate debugging and refactoring

You won't redesign the system from zero.You'll be the engineer who understands how it works, why it works - and makes it work better.We value engineers who think in terms of system efficiency, trade-offs, and practical engineering solutions - and who use AI as a force multiplier, not a shortcut.What We NeedSomeone who can:

Quickly understand a complex, non-trivial architecture
Work confidently with large data volumes (products, orders, inventory updates)
Optimize performance in high-load environments
Design and refine synchronization strategies (what must be instant vs. what can wait)
Take ownership of backend services and keep them reliable
Improve stability and throughput in an already running production system
Be comfortable touching infrastructure and DevOps when needed
Feel at home in a mature system that has been evolving for 10 years
Actively use AI tools to improve clarity, speed up analysis, explore alternatives, and enhance code quality

We don't expect blind reliance on AI - but we do expect thoughtful, practical usage of modern AI-assisted engineering workflows.Our Tech StackCore:

TypeScript, Node.js, MongoDB, PostgreSQL, Prisma, REST, gRPC

Infrastructure:

AWS, Docker, custom queue system (high-volume data processing)

Nice to have:

Temporal.io, Go, React, GraphQL, Valkey,

What we expectStrong senior backend experience (Node.js / TypeScript) * Ability to navigate and understand large codebases

Strong focus on performance and system efficiency
Solid database knowledge (MongoDB / PostgreSQL)
Ownership mindset regarding technical quality and delivery
Comfort operating in high-load, data-heavy environments
Practical openness to AI-assisted development (analysis, debugging, architecture reasoning, refactoring)
English for documentation and technical communication (team communication is primarily in Czech)

Nice to have (not required)Experience with event-driven systems or queue-based architectures * Experience with Temporal.io or similar workflow systems

Background from smaller teams where you had to understand the entire system
Strong interest in performance optimization
Experience in e-commerce or marketplace integrations
Experience designing workflows where AI meaningfully improves engineering productivity

How we workSmall, senior team * Pragmatic Scrum (no process theatre)

Strong focus on delivery, quality, and system reliability
Engineering-driven technical decisions
AI is embedded in our daily workflow - used intentionally to improve clarity, speed, and system understanding

What we offerFlexible remote or hybrid setup * High compensation based on seniority and impact

ESOP plan
Revenue-sharing cash bonus for new revenue streams
Multisport card
Offices in Prague, optionally Ostrava / Třinec / Havířov

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