Available from 9 March
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    Iustin Costea
    5+ years experience
    Romania

    Iustin Costea

    Senior Full-Stack Developer

    Iustin is a Senior Full-Stack Developer with over 8 years of experience across diverse industries including healthcare, trading, e-commerce, and personal development. He specializes in building robust, scalable systems that handle real-world complexity. With deep expertise in Angular, NestJS, and modern cloud infrastructure, Iustin brings a methodical approach to software architecture. He co-founded CosmosLevel alongside Adrian and has been instrumental in building TopSejur's real-time travel booking platform.
    Languages:RomanianEnglish

    What Drives Me

    “I'm driven by the challenge of building systems that just work — reliably, at scale, and under pressure. The best software is invisible to users because it never fails them.”

    Career Highlights

    Co-built CosmosLevel — architecting the backend infrastructure with MySQL InnoDB clusters, Redis sentinels, and NATS microservices

    Built TopSejur's real-time accommodation search with parallel backend processing and WebSocket delivery

    Experience in healthcare, trading, and e-commerce domains

    Infrastructure specialist — Docker, Kubernetes, and multi-location server deployments

    Passionate about monitoring, observability, and zero-downtime architectures

    Technical Skills

    Frontend

    Angular 12–16+TypeScriptTailwind CSSAngular MaterialNext.jsReactResponsive Design

    Backend

    NestJSNode.jsPrisma ORMTypeORMBullMQREST APIsWebSockets

    Database

    MySQLPostgreSQLRedisMongoDB

    DevOps & Infrastructure

    DockerKubernetesNginxGitHub ActionsCI/CD PipelinesCloud Infrastructure

    Testing

    JestPlaywrightE2E TestingIntegration Testing

    Architecture

    MicroservicesEvent-Driven ArchitectureNATS.ioHorizontal ScalingDatabase Clustering

    Projects

    Odycy

    Odycy

    Healthcare

    A UK-based private healthcare marketplace that simplifies the patient journey through integrated search, booking, and payment — replacing a No-Code prototype with a production-grade, enterprise-ready platform.

    CosmosLevel

    CosmosLevel

    SaaS

    A multilingual SaaS platform for professionals who operate on an appointment basis — with booking, payments, and calendar integrations.

    TopSejur

    TopSejur

    Travel

    A travel platform transforming vacation dreams into reality — with tour operator integrations, real-time accommodation search, and seamless booking.

    Want to work with Iustin?

    Let's discuss your project. Book a free discovery call and see how we can help you build something great.

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