Ranjeewa Weerasinghe
Engineering Leader
About
I'm a technology leader with a long view of systems, teams, and the trade-offs that shape both. I've spent over two decades working across startups and large organizations, helping build software that is resilient, understandable, and able to evolve without unnecessary friction. I value long-term professional relationships and often work with people I've partnered with before. I'm motivated by complex, worthwhile problems - and by building systems and teams that are healthy, resilient, and durable.
Work Experience
Intellistack (formerly Formstack)
June 2024 – May 2026
Director of Engineering
Highlights
- Led engineering teams across multiple continents and timezones, including engineering managers, contractors, and full-time employees, to build Intellistack Streamline, a no-code business process automation platform, from the ground up in 18 months
- Owned the Data Fabric layer, connecting heterogeneous datasources (Postgres, EHR systems via FHIR, and others) through a unified connector API
- Owned the Integrations layer, connecting multiple types of integrations (SMS, email, file upload and others) through an IPAAS
- Responsible for hiring and performance management for my teams, including contractor management
Open Raven (acquired by Intellistack)
July 2020 – June 2024
Senior Software Engineer / Technical Director
Highlights
- Built and led the scanning team responsible for the only data discovery solution covering file stores and data stores across AWS, GCP, and Azure, deployed directly within the customer's cloud environment
- Grew from individual contributor to Technical Director, taking on team leadership, hiring, and architectural ownership as the company scaled
- Delivered a scanning engine capable of identifying sensitive data at cloud scale, forming the core of Open Raven's DSPM (Data Security Posture Management) product
Tenable
November 2018 – July 2020
Senior Software Engineer / Tech Lead
As an engineer on the Platform Engineering team, worked on the core frameworks and services powering Tenable's cloud offering. Selected as Tech Lead for the Identity team, responsible for IAM initiatives.
Highlights
- Evaluating 3rd-party identity platforms, and migrating from homegrown authentication system to Okta
- Designing and implementing a new RBAC system
- Improving and maintaining microservices and frameworks written in Groovy, Java, Kotlin, and Node
Skyward, a Verizon company
November 2017 – November 2018
Lead Java Engineer
Skyward builds software to manage commercial UAV (drone) operations. Hired to lead the development team in adopting Agile practices, refactor the legacy codebase to enable faster deployment, and to mentor junior developers.
Highlights
- Refactored airspace generation software for modularity, increased testability, enabling zero-downtime deployments
- Built the industry's first certified LAANC integration with the FAA, collaborating directly with agency counterparts to develop and validate their API endpoints
- Created CI pipelines, containerized services and started using Kubernetes for deployment
Jama Software
October 2011 – February 2017
Technical Lead
Highlights
- Led the team migrating Jama from a monolithic Java webapp to a SOA – including evaluating and designing service frameworks, building services, and developing a Docker-based deployment model for SaaS and on-premises installations
- Developed Jama's first analytics product – data collection endpoints, ETL into ElasticSearch, and visualization with Kibana
- Designed a new technical hiring flow for Jama, resulting in a more efficient and consistent interview process, and better quality hires
- Built multiple integrations between Jama and other products, using REST/SOAP APIs and custom libraries
Agilivant
September 2010 – August 2011
Architect (contract)
First technical hire in this financial products start-up. Advising the founders on technology & platform strategy. Establishing development practices for technical hires. Creating hybrid cloud infrastructure with AWS for development and deployment.
Highlights
- Selected and configured source control, continuous integration and collaboration environments for development team
- Implemented portions of debit card platform including card ordering and account management system, CSR functionality, services layer, IVR & SMS integration, batch processing of ISO 8583 transactions
Collaborative Software Initiative
January 2010 – August 2010
Core Developer
CSI builds and deploys enterprise software products using a unique collaborative approach and open source technologies.
Highlights
- Inno360: building an open innovation platform for organizations to manage their innovation ecosystem
- TriSano: a Ruby on Rails open source surveillance and outbreak management application for public health
Liberty Mutual Insurance Group
April 2007 – January 2010
Technologist
ACS Government Solutions Group
October 2002 – April 2007
Technical Architect
Association of American Medical Colleges
May 2001 – October 2002
Systems Developer – Enterprise Apps
WebMD Corporation
January 1999 – January 2001
Project Lead
Sapient Health Network (acquired by WebMD)
November 1996 – January 1999
Senior Software Engineer
Education
-
1996
Purdue University
MS
Computer Science
-
1993
University of Houston, Clear Lake
BS
Computer Science
Skills
AI
Spring AI
Codex
Claude
Cursor
Backend
Java / JVM languages
Spring
RDBMS (PostgreSQL, MySQL)
Redis
ElasticSearch
Cloud & DevOps
AWS
Google Cloud Platform (GCP)
Kubernetes
Docker
Serverless
CI/CD Pipelines
Architecture & Tooling
System Design
API Design
Microservices