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Sergii Luchko
Full Stack JavaScript • Team Lead • Mentor

// services / For Companies

Full Stack JavaScript Consulting & Team Leadership for Your Company

I help companies build scalable web applications, modernize existing systems, and lead teams to deliver high-quality software on time.

What I Offer to Companies

Full-Stack Development

I join your team as a Senior Full-Stack JavaScript developer to ship high-quality features fast.

Implement complex features end-to-end using modern frameworks
Modernize legacy apps: safe refactors, incremental migrations, zero-downtime releases
Raise quality with CI/CD and test improvements for safer releases

Cloud Architecture (AWS)

I design secure, cloud-native architectures on AWS that scale, stay reliable, and control cost.

Design cloud-native systems leveraging managed AWS services
Build secure foundations: VPC, IAM, least-privilege, secrets management, and multi-env setups
Reliability first: observability, autoscaling, graceful degradation, backup/restore

API Development

I build clean, well-versioned APIs and event flows in Nest.js - ready for production from day one.

Define clear contracts & versioning; generate types/clients for HTTP and gRPC
Implement Nest.js microservices with consistent validation, error handling, and auth
Event-driven flows with Kafka: producers/consumers, idempotency, DLQs, retries

Database Design

I choose the right data store and model for scale, performance, and integrity - then tune it properly.

Choose the right store for the job
Model schemas/partitions for scale
Caching strategies with Redis/Memcached

Performance Optimization

I find and fix bottlenecks across frontend, backend, and databases to lower p95/p99 and improve UX.

Frontend: measure and fix LCP/CLS/TTI, bundle size, lazy loading
Backend: reduce p95/p99 latency via profiling, async I/O, connection reuse
Databases: query plans, indexes, pagination, caching layers

Team Leadership

I provide technical direction, mentor developers, and align delivery with business goals.

Set technical direction and roadmaps aligned with business goals
Grow people: mentoring, onboarding, interviewing, leveling, and feedback culture
Cross-team collaboration with product, security, and ops
See full experience

Why companies hire me

Fast & Reliable Delivery
14+ years of experience shipping scalable software on time
Full-Stack Expertise
End-to-end coverage: frontend, backend, databases, and cloud - no gaps, no handoffs
Leadership that Scales
I mentor developers and align teams with business goals to boost productivity
Reduced Risk
Secure, clean architectures and proven practices ensure stability and compliance

Ready to start your project?

Let's discuss how I can help your team build better software. I'm available for both short-term consulting and long-term project partnerships.

Get in Touch