Shiva Singh

Software Engineer with 5+ years of experience building and scaling SaaS applications using Ruby on Rails. Experienced in owning backend systems, designing RESTful APIs, and improving performance of production applications. Strong in database optimization, third-party integrations, and writing reliable, well-tested code. Comfortable working in agile (SCRUM) environments and collaborating with product, QA, and business stakeholders to deliver stable and scalable solutions.

Software Engineer at Kreeti Technologies Private Limited (2021 – Present)

• Owned backend architecture and led development of scalable RESTful APIs using Grape, supporting production-grade financial workflows in a SaaS environment
• Designed and maintained reliable integrations with third-party services (HubSpot, Singpass, IAM Smart etc), implementing error handling and retry mechanisms for production stability
• Improved system performance by 50% optimizing database queries, Sidekiq background jobs, and API response times in multiple client projects
• Collaborated with product managers, QA, and stakeholders in a SCRUM environment, contributing to sprint planning, technical decisions, and mentoring team members
• Contributed to code quality improvements, mentoring junior developers, creating technical documentation, integration guides and jira stories
• Handled multi-environment deployments and supported AWS infrastructure improvements to ensure smooth and reliable releases
• Experience working with technologies and frameworks like relational databases, Elasticsearch, and Redis.
• Developed reminder and notification systems to support real-time task tracking and improve operational efficiency in production
• Contributed to backend development by building reusable and maintainable modules to support scalable feature development
• Wrote tests using RSpec and fixed bugs to ensure stable and reliable application performance
• Designed and implemented background job workflows using rake tasks for scheduling and automating recurring operational processes Trainee Web
• Developed CRUD functionalities along with search and filtering features
• Wrote test cases using RSpec and improved application security by integrating Brakeman for vulnerability detection
• Designed and built responsive user interfaces using HTML, CSS, and Bootstrap.

Bachelor of Technology (B.Tech) in Computer Science & Engineering (Hons.) – Lovely Professional University (2016-01 – 2020-12)