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
All your information will be kept confidential according to EEO guidelines.
Lead Ruby Developer - (ActiveRecord, Arel, middleware stack) • Chicago, Illinois, United States
Candidate will be allowed to work remotely.No work outside the United States is allowed.Candidate must work EST business hours.Our direct client has an opening for a Sr Rhapsody Developer # 9656.Th... Show more
PatientIQ is a fast-growing healthcare technology company on a mission to improve patient outcomes through smarter, data-driven care.We work with healthcare providers, life sciences organizations, ... Show more
Run containerized AI workloads at scale with effective resource optimizationLead Fullstack SWE50% UI Dev :Dashboards for Hyperscale Infrastructure platform (React, Next.TypeScript, Tailwind)50% Bac... Show more
Must be legally authorized to work in the United States for any employer without sponsorship.Java Spring Boot microservices.The ideal candidate will have a deep understanding of microservice design... Show more
A manufacturing transformation project is integrating Oracle E-Business Suite (on-prem) with a paperless Manufacturing Execution system.The role involves bi-directional integrations using a publish... Show more
Principal-level Syndigo / Riversand Architect / Senior Developer.APIs, middleware, data pipelines).MDM strategy, architecture, and implementation roadmap.Lead and mentor teams while remaining.River... Show more
Sales Compensation Design Lead.Stripe is a financial infrastructure platform for businesses.Millions of companiesfrom the world's largest enterprises to the most ambitious startupsuse Stripe to acc... Show more
Define target-state integration architecture for Earnix across quoting, rating, underwriting, billing, and renewal journeys, aligning to Hiscox reference architecture and security standards.Select ... Show more
Synch-Solutions is looking for a UiPath Developer who will deliver Automation Projects in the Automation Program Portfolio.This position is 100% remote with no travel and will be a full-time 1099 /... Show more
Nous et certains tiers sélectionnés utilisons des technologies et des outils de suivi (témoins) pour recueillir des renseignements sur votre utilisation de ce site Web.Les témoins essentiels soutie... Show more
A technology company in Chicago is seeking a Mid-Senior Level Expert in Cloud Automation.The role emphasizes building and optimizing containerized environments using Kubernetes and fully automating... Show more
A leading Chicago-based tech firm is seeking a Solution Architect to lead technical design and architecture of CMS-based web solutions.You'll define architecture standards, oversee CMS migrations, ... Show more
Job Title- Gov Cloud Program Lead Project Location Remote Duration- 6 months contract Visa- USC Job Description:Senior level Must have:Cloud projects all three Clouds (proficient in at least 2) - A... Show more
Candidate will be allowed to work remotely.No work outside the United States is allowed.Candidate must work EST business hours.Our direct client has an opening for a Sr Rhapsody Developer # 9656.Th... Show more
Job Title: Desktop Site Lead</b></p> <p class="wordsection1"><b>Location: Chicago, IL</b></p> <p class="wordsection1"><b>Job Desc... Show more
A leading financial technology company based in Chicago is seeking an Engineering Director to enhance the developer experience for its API integrations.In this key leadership role, you will shape t... Show more
A leading financial technology company is seeking a Senior Product Manager for APIs & Integrations to shape the platform vision.This role involves defining integration strategies, leading cross... Show more
Site Reliability Engineering Team Lead (Hybrid).Be among the first 25 applicants.We are interested in every qualified candidate who is eligible to work in the United States.However, we are not able... Show more
