#Hiring..! #C2C #Ruby #Chicago #RubyOnRails #RailsDeveloper #BackendEngineering #NowHiring
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🚀 We’re Hiring: Lead Ruby Developer (12+ Years Experience)
📍 Location: Chicago, IL (On-site – 5 Days/Week)
🕒 Duration: 12+ Months Contract
We are looking for a highly experienced Lead Ruby Developer to join a high-impact engineering team working on large-scale, high-performance systems. This role is ideal for someone who has deep expertise in Ruby internals and has successfully scaled enterprise-grade applications.
Key Responsibilities & Expertise:
We are seeking a hands-on engineer with deep mastery in:
Ruby & Rails Internals
12+ years of Ruby development experience
Strong understanding of MRI internals (GIL, memory model, object allocation)
Ruby GC (mark & sweep, generational GC) expertise
Rails internals (ActiveRecord, middleware stack, Arel)
Performance tuning: N+1 queries, memory leaks, slow query optimization
Concurrency & Performance Engineering
Multi-threaded Ruby (Puma, Sidekiq tuning)
Thread pools, Fibers, Ractors
Async frameworks (Falcon, Async gem)
Proven ability to scale Rails apps to 10K+ RPS and millions of transactions/day
Low-latency optimization (sub-50ms API response under load)
Distributed Systems & Architecture
Event-driven systems (Kafka / RabbitMQ)
CQRS, Event Sourcing, Saga patterns
Schema design (Avro / JSON Schema) & evolution
Strong understanding of eventual consistency & distributed transactions
Idempotent API design
Data & Storage:
PostgreSQL (indexing, query tuning, locking, replication)
Redis (pub/sub, distributed locks, caching strategies)
Database sharding and read replicas
Background Processing
Deep Sidekiq expertise (queues, retries, dead jobs, middleware)
Redis contention debugging
Job idempotency design
Cloud & DevOps:
AWS (EKS, RDS, SQS, Lambda)
Docker & Kubernetes
CI/CD pipelines (GitHub Actions / Jenkins)
Observability: Prometheus, Grafana, ELK/OpenSearch
Security & APIs
OAuth2 / JWT authentication
Secure API design (rate limiting, mTLS, encryption)
PCI-DSS exposure preferred
Bonus Experience
High-frequency trading / payment systems / crypto platforms
JRuby / TruffleRuby
GraphQL & gRPC
Fraud detection & real-time risk engines
If you or someone in your network fits this profile, please email at [Upgrade to PRO to see contact] or DM me with your updated resume.