Lead Ruby Developer

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Job Description :

Strong Expertise with Ruby:

Minimum 12 Years Of Experience On Ruby

Deep knowledge of Ruby MRI internals (GIL, memory model, object

allocation)

Ruby MRI garbage collector (mark & sweep, generational GC)

Strong experience with Rails internals (ActiveRecord, Arel, middleware

stack)

Ability to optimize slow queries, N 1 issues, and memory leaks

Experience with multi-threaded / concurrent Ruby (Puma, Sidekiq tuning)

Ruby VM instruction set (YARV bytecode basics)

Concurrent Ruby gem

Thread pools vs Fibers vs Ractors

Async frameworks (Falcon / Async gem)

Experience integrating Ruby with Kafka (ruby-kafka / Karafka), exactly-once

semantics handling

Designing: event schemas, schema evolution (Avro / JSON schema)

Proven experience scaling Rails apps to:

10K RPS

millions of daily transactions

Hands-on experience with:

Event-driven architecture (Kafka / RabbitMQ)

CQRS & Event Sourcing

Saga pattern (choreography & orchestration)

Strong understanding of:

Eventual consistency

Distributed transactions

Idempotent APIs

Deep understanding of:

Caching strategies (Redis, Memcached)

Background processing (Sidekiq, Resque)

Database sharding and read replicas

Strong experience with:

PostgreSQL (query tuning, indexing, vacuum, locking)

Redis (data structures, pub/sub, distributed locks)

Ability to debug:

deadlocks

slow queries

replication lag

Low-Latency / High-Throughput Optimization

Experience achieving

• sub-50ms API latency under load
• High throughput using connection pooling, query batching
  
  

Hands-on tuning:

• Puma workers vs threads trade-offs
• kernel tuning (ulimits, TCP tuning)
  
  

Deep Sidekiq Internals:

Queue prioritization strategies

Dead job recovery

idempotent job design

Redis contention debugging

Sidekiq middleware customization

Experience with:

AWS (EKS, RDS, SQS, Lambda)

Docker & Kubernetes

CI/CD pipelines (GitHub Actions / Jenkins)

Observability stack:

• Prometheus
• Grafana
• ELK / OpenSearch
  
  

OAuth2 / JWT authentication

PCI-DSS exposure (preferred)

Secure API design (rate limiting, mTLS, encryption)

Experience working at:

high-frequency trading firms

payment processors

crypto exchanges

JRuby / TruffleRuby

GraphQL APIs

gRPC services

Exposure to:

fraud detection systems

real-time risk engines