Resend Tech Stack

Email infrastructure for developers with streaming-first observability

Software Development San Francisco, CA 11–50 employees Founded 2023 Privately Held

Resend operates an email platform designed for developer workflows. The tech stack reveals a data-and-observability-first architecture: Kafka, Flink, Spark, and ClickHouse sit alongside PostgreSQL, indicating heavy streaming ingestion and real-time analytics. Active projects around SLO tracking, ETL pipelines, and abuse-prevention models suggest the company is wrestling with the classic infrastructure scaling challenge — reliable delivery at volume. The pain-point list (reliable ingestion, preventing abuse at scale, supporting across time zones) maps directly to the project roadmap, showing alignment between technical and operational priorities.

Tech Stack 26 technologies

Core StackPython Kafka Apache Airflow Apache Flink Apache Spark Next.js Retool Node.js TypeScript React Express PostgreSQL ClickHouse Datadog AWS JavaScript GitHub Terraform Grafana OpenTelemetry Ashby Figma SQL Notion Hono AWS CDK

What Resend Is Building

◆Challenges

Maintaining reliable scalable platform
Maintaining safe email platform
Ensuring reliable ingestion
Scaling support team
Handling increased demand across all time zones
Maintaining safe place for senders
Preventing abuse at scale
Prevent churn
Expand existing customers
Building repeatable sales motion

▲Active Projects

Automation for recovery scaling self-healing systems
Improve observability across stack
Define and track slos for core systems
Etl/streaming pipelines for logs and events
Improving internal workflows
Creating documentation
Building proactive relationships
Zero-friction email sending approach
Real-time dashboards and alerts
Machine learning abuse prevention models

Hiring Activity

Decelerating10 roles · 3 in 30d

Department

Engineering

Data

Design

Sales

Security

Support

Seniority

Mid

Senior

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About Resend

Resend provides email infrastructure built for developer audiences. Founded in 2023, the company operates from San Francisco with 11–50 employees. The platform emphasizes ease-of-integration, reflected in the active project around zero-friction email sending. The tech stack spans Python and Node.js backends (Express, Hono), Next.js/React frontends, and a modern data layer (Kafka, Flink, Spark, ClickHouse, PostgreSQL). Observability is central: Datadog, Grafana, and OpenTelemetry instrumentation, plus dedicated work on SLOs and real-time dashboards. The org is structured with mid-level and senior IC roles balanced across engineering, data, design, security, and support — typical for a post-seed, product-focused startup scaling toward operational maturity.

HeadquartersSan Francisco, CA

Company Size11–50 employees

Founded2023

Hiring MarketsFrance, United States

Frequently Asked Questions

What is Resend's tech stack?

Python, Node.js, TypeScript, Next.js, and React on the application layer; Kafka, Apache Flink, and Apache Spark for data streaming; PostgreSQL and ClickHouse for storage; Datadog, Grafana, and OpenTelemetry for observability; AWS for compute and infrastructure-as-code via AWS CDK and Terraform.

Is Resend hiring engineers?

Yes. Resend has 11 active roles, with 5 dedicated to engineering (mid-level and senior). Hiring velocity is decelerating. Open positions span engineering, data, design, security, support, HR, and sales across the United States and France.

Where is Resend headquartered?

San Francisco, California. The company was founded in 2023 and is privately held with 11–50 employees.