Developer building backend systems, cloud-native platforms, and useful open source contributions.

I like working on things that are practical and visible in production: backend correctness, cloud-native systems, developer tooling, and product reliability.

• fixing backend and API edge cases before they become production pain
• improving frontend reliability and failure handling
• contributing tests alongside fixes so behavior stays locked in
• building Kubernetes and GitOps-friendly systems around real products and workflows

Alongside building my own products, I contribute upstream to projects I genuinely want to learn from and help improve.

• Continum (continum.online)
  AI-powered email automation and workflow platform with Gmail integration, memory, queues, and multi-service orchestration.

• Vaulta
  Desktop browser and wallet-style application built with React, Tauri, Electron tooling, and viem, with chain-aware browsing, wallet panels, and desktop security-focused plumbing.

• Answerly
  Interview practice assistant focused on voice transcription, privacy-aware usage, and OpenAI-powered answer drafting during mock interview workflows.

• Webhook Engine
  Self-hostable webhook orchestration system built on Supabase and Postgres with durable queues, automatic retries, dead-letter handling, and observability tooling.

• fossology-k8s-poc
  Kubernetes-native FOSSology deployment PoC focused on worker scaling, scheduler coordination, and Argo CD-friendly structure.

• mandarjoshi-portfolio
  Personal site where I document what I build, what I contribute to, and what I am learning next.

I do not want this profile to be just a list of PR statuses, so here are stable references to the projects I contribute to and the kind of work I usually do there.

• FOSSology: API correctness, import reliability, null-safety, backend fixes, and deployment-related improvements. My PRs
• Supabase: Studio reliability, table editor behavior, CSV import correctness, and self-hosted product flows. My PRs
• PostHog: frontend resilience, error handling, UX polish, and runtime copy improvements. My PRs
• Cal.com / Cal.diy: scheduling and availability logic, setup copy, and product polish. My PRs

• GitHub: github.com/mandar1045
• LinkedIn: Mandar Joshi
• Portfolio: mandarjoshi-portfolio.vercel.app
• Email: mandarjoshi1045@gmail.com