Lead Ruby Developer (ActiveRecord, Arel, middleware stack)

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 N1 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

o sub-50ms API latency under load

o High throughput using connection pooling query batching

Hands-on tuning:

o Puma workers vs threads trade-offs

o 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:

o Prometheus

o Grafana

o 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.

Regards

Mohammed ilyas

PH - or text - or you can share the updated resume at com

Additional Information :

All your information will be kept confidential according to EEO guidelines.

Remote Work :

No

Employment Type :

Contract