Senior Ruby on Rails Developer - Sidekiq/Resque
Ajackus
Greater Kolkata Area
Information Technology
At Ajackus, we build scalable, secure, and high-performing digital products for global clients across fintech, healthtech, AI, and enterprise technology.
We are looking for an experienced Senior Ruby on Rails Developer who can architect solutions, lead complex features, mentor engineers, and set high engineering standards.
You will work across backend systems, integrations, cloud infrastructure, and performance optimization to deliver robust, maintainable, and enterprise-grade products.
What You'll Do
- Architect and develop scalable backend systems using Ruby on Rails.
- Design and optimize RESTful APIs, background jobs, services, and third-party integrations.
- Translate product requirements into detailed technical specifications and roadmap-level plans.
- Work with databases (PostgreSQL/MySQL): schema design, normalization, indexing, and performance tuning.
- Build cloud-native solutions using AWS/GCP, including CI/CD pipelines and containerization.
- Debug and solve complex issues across distributed systems and backend components.
- Conduct thorough code reviews, enforce best practices, and guide mid-level/junior developers.
- Make architectural decisions, propose optimizations, and improve system reliability.
- Collaborate closely with product, QA, DevOps, and design teams for end-to-end delivery.
- Contribute to improving engineering processes, internal tools, automation, and documentation.
- 5 years of hands-on experience with Ruby on Rails and backend engineering.
- Deep understanding of MVC, service-oriented design, scalable system patterns, and API architecture.
- Strong experience with relational databases and performance optimization.
- Expertise with background processing tools like Sidekiq/Resque and caching frameworks.
- Advanced debugging skills and the ability to operate in complex, legacy or large-scale codebases.
- Experience using AI-assisted coding tools (GitHub Copilot, Cursor, Claude Code, Codeium, Tabnine, etc.) to boost development efficiency, improve code quality, and support rapid prototyping.
- Ability to lead technical discussions, mentor developers, and contribute to architectural decisions.
- Strong communication skills and the ability to collaborate with cross-functional teams.
- Experience with microservices, message queues, or event-driven architecture.
- Exposure to frontend frameworks (React/Vue) is a plus.
- Familiarity with Docker, Kubernetes, Terraform, or other DevOps tools.
- Experience integrating complex external systems, payment gateways, or enterprise APIs.
- Prior client-facing experience or involvement in solutioning for global teams.
- Work on mission-driven, global-scale products across modern tech ecosystems.
- High ownership, autonomy, and influence in architectural and technical decisions.
- Collaborative, transparent, and high-performance engineering culture.
- Opportunities to transition into lead architect roles, solution ownership, or cross-domain engineering.
- Continuous learning across diverse projects involving AI, automation, distributed systems, and more.
About the company
Company website•Technology, Information and Internet, Software Development, Technology, Information and Media
Ajackus delivers software up to 10x faster using AI-augmented engineering teams. In 14+ years, we've powered $1B+ in client success across FinTech, PropTech, Healthcare, and Enterprise.
We started in a living room 14 years ago. Our first client product, Dotloop, was acquired by Zillow for $110M. That set the standard: engineering excellence that creates real business value.
Since then, we've helped growth-stage startups and global enterprises — Nium, VTS, JLL, Visa, Guidehouse, Gulf Oil — ship products that touch millions of lives across fintech, health tech, prop-tech, and beyond.
In 2024, we embedded AI across our entire development lifecycle. Every Ajackus engineer now works with Claude Code, Cursor, and Copilot — backed by prompt libraries, human review gates, and measurable delivery metrics. Projects that used to take months now ship in weeks.
How we work with you:
→ AI-Accelerated Sprints — MVPs in 4–8 weeks, fixed fee
→ Continuous AI Delivery — milestone-based ongoing development
→ AI Enablement Consulting — help your team adopt AI tools with governance and training
→ Team Augmentation — AI-equipped engineers embedded in your workflow
Our track record:
→ 300+ projects · $1B+ client value created · Multiple $100M+ exits
→ Clients across 5 continents and 20+ countries
→ 4.9/5 Clutch · 5/5 GoodFirms · Recognized by The Manifest & Great Place to Work
Vision: To be the world's most trusted AI-accelerated engineering partner, powered by world-class talent from India.
Values: Empathy, Inclusivity, Adaptiveness, Diligence, Trust, Progress, Confidence & Curiosity.
Locations: India (HQ), USA, and UAE.
Ready to ship in weeks, not months? [email protected]