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        Sushant Kumar

        Software Engineer II

        Building high-throughput, fault-tolerant distributed backend systems, event-driven architectures & microservices.

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        Technical Skills

          Java Spring Boot Apache Kafka Go C++ Python Kubernetes Docker Helm Keycloak PostgreSQL MongoDB Redis OAuth2 Camunda ELK Stack

        Education

          B.Tech in Electronics & Communication

          National Institute of Technology Sikkim

          Aug 2018 – May 2022

        Professional Experience

                Software Engineer II

                Conology GmbH • Bangalore, India

              March 2024 – Present
              * Architected a dual-format messaging bridge in carrier gateways, decoupling legacy SOAP/WSDL transactions to TMF-compliant JSON via Apache Kafka, reducing p99 latency by 85% (1.2s to <90ms).
              * Designed a tenant delegation framework decoupling core order-processing logic, reducing client onboarding time from weeks to 2 days.
              * Engineered real-time Kafka messaging integration on Confluent Cloud (10M+ daily events) with DLQs and idempotency keys.
              * Designed event-driven platform notification service in Spring Boot/Kafka with MongoDB local caching for sub-second email delivery.
              * Implemented Keycloak OAuth 2.0 unified security gateway across 15+ microservices.

                Software Engineer

                Enfusion • Bengaluru, India

              Jan 2022 – March 2024
              * Optimized core order processing pipelines for electronic trading platform executing up to 450K daily orders at 99.99% availability.
              * Redesigned Auto Short Locate validation system and End-of-Day batch processing pipeline scaling ingestion to 300M+ records.
              * Refactored pre-trade risk check validation service, reducing latency by 90% (5+ mins to <30s).
              * Built low-latency FIX protocol adapters with custom byte-level message decoding for sub-millisecond order routing.

        Open Source Contributions

            Keycloak (Java, OAuth2, Workflows)

            View Keycloak PRs
            * Implemented RemoveRequiredActionStepProvider to allow admins to remove required actions during workflow execution.
            * Extended NotifyUser workflow step to support configurable email targets including alternate users and mailing lists.

        Personal Projects

            Multi-Tenant Kubernetes Cloud Platform

            selfhostit.dev
            K3s / k3d Helm 3 Traefik Cert-Manager Argo CD Umami
            * Architected and deployed a modular, production-grade Kubernetes hosting framework, orchestrating 18+ self-hosted OSS applications across isolated apps, monitoring, and ai namespaces on a single Hetzner Cloud VPS.
            * Implemented GitOps continuous delivery with Argo CD and a universal reusable Helm chart abstraction — every app deployed via git push with zero manual intervention.
            * Configured wildcard DNS, automated TLS with Let's Encrypt (Cert-Manager), and Traefik ingress routing with source IP preservation for accurate GeoIP analytics.
            * Integrated Umami Analytics with N8N automated daily DAU reporting pipeline dispatching metrics to Discord and Instagram.

        GitHub Projects & Repositories

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