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§ Private Profile · Newark, NJ, USA
Developer tools provider offering Testcontainers Cloud for container-based integration testing, now part of Docker.
Based in New York City, AtomicJar provides cloud-based integration testing solutions and container management platforms for software developers across the application lifecycle. The company operates the popular open-source Testcontainers framework, which has surpassed 100 million global downloads, alongside its commercial enterprise platform known as Testcontainers Cloud. Prior to its strategic acquisition, the enterprise software developer secured $29 million in total venture capital funding from lead financial backers including Insight Partners and boldstart ventures. AtomicJar serves prominent enterprise technology customers such as Netflix and Uber by streamlining their complex application creation, database management, and software deployment processes. In December 2023, the startup was officially acquired by Docker to integrate its cloud-based testing infrastructure directly into Docker's broader commercial developer tool suite. AtomicJar was originally founded in 2021 by co-founders Richard North and Eli Aleyner.
AtomicJar has raised $29.0M across 2 funding rounds.
AtomicJar has raised $29.0M in total across 2 funding rounds.
AtomicJar has raised $29.0M across 2 funding rounds. Most recently, it raised $25.0M Series A in January 2023.
AtomicJar has raised $29.0M in total across 2 funding rounds.
AtomicJar's investors include Boldstart Ventures, Insight Partners, Jonathan Rosenbaum, 2050 Capital, Accel, Addition, Angular Ventures, Band of Angels, Baukunst, Cedar Capital Group, Cerulean Ventures, Tom Hulme.
AtomicJar is a software development company that builds developer productivity tools focused on simplifying and automating integration testing through its open-source Testcontainers framework and cloud service, Testcontainers Cloud. It serves developers and QA teams by enabling reliable, isolated testing environments using Docker containers for databases, message brokers, and other services, solving the pain of flaky tests, manual setup, and "works on my machine" issues in CI/CD pipelines.[1][2][4][6] AtomicJar achieved strong growth with Testcontainers seeing ~10 million monthly Docker pulls and rapid community adoption before its acquisition by Docker in 2024, which integrated its capabilities into Docker's ecosystem for enhanced cloud-native testing.[2][3][4]
AtomicJar was founded in 2021 by the original developers of Testcontainers, an open-source library created in 2015 by Richard North to simplify Docker-based integration testing for services like databases.[3][4] Key founders include Sergei Egorov (CEO), Eli Aleyner (Co-Founder), Marc Tremsal (Head of Product), and Oleg Selajev (Head of Developer Relations), bringing expertise in software engineering, developer advocacy, and product management; the company operated from New York with a distributed team.[1][2] The idea emerged from enhancing Testcontainers with cloud capabilities to address local compute limits and enterprise needs, leading to Testcontainers Cloud's public beta launch—backed by investors like Insight Partners after developer surveys confirmed demand.[4] Early traction came from Testcontainers' widespread adoption, especially among JVM developers, setting the stage for AtomicJar's commercialization.[3]
AtomicJar rides the cloud-native and microservices wave, where containerization (via Docker/Kubernetes) dominates but testing lags due to complex dependencies—its tools address this by making integration testing seamless in DevOps workflows.[2][3][4] Timing is ideal amid rising developer productivity demands, with 90M+ developers facing "shift left" pressures; market forces like AI-assisted development and CI/CD maturity favor it, as early bug fixes cut costs.[2][4][6] By stewarding Testcontainers, AtomicJar influences the ecosystem, accelerating adoption of container-based testing and enabling Docker to expand into AI/data-driven tools, impacting software quality across industries.[2][3]
Post-Docker acquisition, AtomicJar's tech will deepen integration with Docker's platform, blending Testcontainers Cloud with security scanning and AI for smarter, end-to-end cloud-native testing—potentially powering automated workflows in IDEs and CI.[2] Trends like multimodal AI, edge computing, and collaborative Cloud IDEs will amplify its reach, evolving influence toward enterprise-scale reliability as microservices proliferate. This positions it as a cornerstone for faster, more resilient software delivery, fulfilling its founding promise to make developers "faster and happier."[6]