Lead Ruby Developer - (ActiveRecord, Arel, middleware stack)

We provide Recruitment and Staffing services to many industries and domain through our innovative and customized solutions and passionate commitment to research. Ability to understand the hiring strategies, availability of talent and compensation benchmarking makes us proud hiring partner for various industries. We work as trusted business partners and always strive to deliver the most value and highest return on investment for our clients. We are highly trained business professionals with strong understanding of clients need. We work closely with the leading staffing trade associations, training, and research organizations to ensure we are knowledgeable of the latest industry trends and technologies.

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

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 - 229-264-4024 or text - 229-469-1455 or you can share the updated resume at Mohammed@vtekis. com

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