Lead Ruby Developer

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Hello,

Please find the below requirement and let me know your thoughts

Position: Lead Ruby Developer

Location: Chicago, IL -100% onsite work

Duration: Longterm

Experience Required: 12 years

Required Technical Expertise:

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
  
  

Submission details

Full Legal Name as per SSN:

Email ID:

Contact Number:

Current location (City name, State, ZIP code) :

DOB: (dd/mm)

Are you willing to relocate? (Yes/NO)

Best time to reach (Mon-Fri):

LinkedIn ID(Must) :

Initial entry of US (Visa status) and the current status Approval (year):

Are you done with your current project? (Yes/No):

(If YES please mention Last date of the Project):

Last 4 digits of SSN :

Highest Degree:

Name of the University, specialization, Location (Start Date (MM/ YYYY)– Ending Date(MM/YYYY)):

Professional references in below format is mandatory for client submission:

Note: GMAIL, YAHOO, OUTLOOK mails are not Considered

Reference 1 :

Client Name:

Reference Name:

Reference Job Title:

Reference Professional/ Official E-mail Address:

Reference Phone Number:

Reference 2 :

Client Name:

Reference Name:

Reference Job Title:

Reference Professional/ Official E-mail Address :

Reference Phone Number:

Thanks & Regards,

Vasu

Intellisoft Technologies Inc.,

11494 Luna Road, Ste 280

Farmers Branch, TX -75234

(O) ext 131