Calmantara Sumpono Putra

• Led a cross-functional team of backend, frontend, mobile, and QA engineers, reporting directly to the CTO to drive team efficiency and product quality
• Diagnosed and resolved a critical data latency issue, reducing lag from 60+ minutes to under 1 minute (98%+ improvement), directly unblocking real-time operational decisions
• Partnered with the Product Manager to own and manage the engineering roadmap, balancing feature delivery with technical debt and reliability goals
• Improve development culture by implementing API First principle and make High level architectural design before executing project
• Conducted comprehensive risk assessments across engineering projects, proactively identifying and mitigating issues before they impacted timelines or budgets
• Mentored junior engineers through structured coaching, code reviews, and technical guidance, raising team standards and accelerating individual growth

Technologies: Ruby on Rails, Golang, Node.js, PostgreSQL, MQTT, Kafka, RabbitMQ

• Built the company’s end-to-end IoT platform from the ground up as the first IoT engineer, turning IoT into a strategic product capability and enabling new enterprise features.
• Architected distributed ingestion pipelines capable of processing 7M–10M IoT data points per day with high reliability and fault tolerance.
• Designed real-time product infrastructure using MQTT and Server-Sent Events powering operational dashboards used by internal and external teams.
• Integrated AI-powered video analytics with backend services, enabling automated insights and new intelligent product features.
• Reduced CI/CD deployment time by ~50% by redesigning pipelines and introducing automated testing and build optimization.
• Implemented standardized integration testing across Go microservices achieving ~100% service coverage, significantly improving reliability and developer velocity.
• Initiate development culture by implementing API First principle and make High level architectural design before executing project
• Conduct pair programming with Junior and or Cross fucntional team to speed up the process and implementation

Technologies: Go, Node.js, Python, Ruby in Rails, Kafka, Redis, PostgreSQL, Kubernetes, AWS, MQTT

• Ranked Top 3 Go (Golang) instructor across the program for teaching effectiveness and student outcomes.
• Mentored 50+ students per cohort on backend engineering, distributed systems, networking, and database architecture.
• Designed hands‑on curriculum enabling students to deploy production‑ready backend services on real cloud infrastructure.
• Introduced modern engineering topics including LLM integrations and DevOps workflows to keep curriculum aligned with industry practices.

Technologies: Go, Node.js, Python, PostgreSQL, Docker, AWS, LLM, Machine Learning

• Led a cross-functional team of 6 engineers responsible for fintech repayment infrastructure supporting thousands of daily loan transactions.
• Delivered platform improvements that reduced non-performing loans by ~25–30%, directly improving portfolio health and business performance.
• Designed backend services supporting high-volume repayment workflows and financial data processing.
• Coordinated multiple engineering and product teams to launch new repayment features impacting tens of thousands of borrowers.
• Mentored engineers through pair programming, code reviews, and system design guidance to improve team engineering standards.

Technologies: Go, Node.js, Python, PostgreSQL, MongoDB, GCP, Redis, PubSub, Kafka

• Re-architected the loan auto-order system improving execution speed by 90%+ and reducing financial risk exposure by ~99%.
• Improved core product workflow efficiency by ~80%, increasing system Apdex score from 0.3 → 0.9 and significantly improving user experience.
• Eliminated critical data reliability issues, reducing data loss by ~99% by redesigning data creation and persistence pipelines.
• Introduced event-driven architecture using PubSub enabling scalable product features and asynchronous processing pipelines.
• Migrated critical services to Cloud Run serverless infrastructure with zero downtime, improving scalability and reducing operational overhead.

Technologies: Go, Node.js, Python, PostgreSQL, MongoDB, GCP, Redis

• Led a multidisciplinary engineering team of 7+ spanning backend, frontend, mechanical, and IoT domains.
• Architected an event‑driven IoT platform using Kafka enabling real‑time device communication and scalable telemetry processing.
• Built backend infrastructure supporting integrated payment workflows and connected hardware devices.
• Mentored engineers through structured 1‑on‑1 sessions and technical coaching to improve team capability.
• Worked directly with CEO and COO translating product strategy into executable engineering roadmaps.

Technologies: Go, Node.js, Docker, PostgreSQL, MongoDB, Redis, AWS, Kafka

• Designed ESP32‑based hardware modules for real‑time asset tracking systems.
• Built MQTT‑based cloud communication infrastructure enabling secure and reliable device telemetry transmission.
• Implemented ETL pipelines storing IoT telemetry into InfluxDB for time‑series analytics.
• Delivered proof‑of‑concept prototypes and MVP systems from concept through production launch.

Technologies: Go, C++, Arduino, ESP32, PostgreSQL, InfluxDB, Kafka, Redis

• Led a large cross‑functional engineering team of 18 members across IoT, backend, frontend, and UI/UX disciplines.
• Designed high‑availability industrial IoT platforms deployed on on‑premise client infrastructure.
• Performed load and stress testing to determine infrastructure sizing and guarantee production reliability.
• Implemented CI/CD pipelines using GitLab and Jenkins improving development velocity and release quality.
• Supported enterprise sales by architecting IIoT solutions that helped secure major client projects.

Technologies: Node.js, Python, ThingWorx, PostgreSQL, MSSQL, Docker, NGINX, JMeter

• Developed and delivered ThingWorx projects to clients, ensuring successful implementation and adoption of industrial IoT solutions.
• Mitigated project risks by mentoring and managing engineering teams, proactively addressing technical challenges before they impacted delivery.
• Maintained and provided ongoing support for existing projects, ensuring system reliability and client satisfaction post-launch.
• Led proof-of-concept (PoC) initiatives to enhance data storage and processing using InfluxDB and native data streams.
• Conducted knowledge-sharing sessions on ThingWorx technology, elevating team expertise across the organization.

Technologies: Node.js, Python, ThingWorx, ThingWorx Analytics, PostgreSQL, MSSQL, NGINX, Docker, JMeter