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Sebastian Aranda

@sebastianaranda

Senior Software Engineer at TransformAI building AI-agent tool calling and external data synchronization for a multi-tenant SaaS platform.

Colombia

Message

At TransformAI, I build core product and backend capabilities for an AI-native, multi-tenant SaaS platform. I designed and implemented the tool-calling layer for controlled, auditable agent operations and integrated MCP servers to expose product capabilities to external agents.

I also built an end-to-end data synchronization engine for Google Drive and Microsoft SharePoint, covering permissions, background workers, and configuration workflows. My work includes improving agent reliability and designing product entities with access policies and field-visibility controls.

Before TransformAI, I led backend and frontend teams at SoftServe and served as a backend Discipline Lead at Endava. Across roles at Endava and Tata Consultancy Services, I worked on distributed systems, core banking modernization, and large-scale migrations; earlier, at CosmicGo and City of EDEN, I developed Node.js services, APIs, and applications.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

TransformAI

Feb 2026 - Present (8 months)

Build core product and backend capabilities for an AI-native, multi-tenant SaaS platform using TypeScript, Node.js, PostgreSQL, Effect-TS, AWS, and frontier LLMs. Designed and implemented the tool-calling layer for AI agents and built an external data synchronization engine for Google Drive and Microsoft SharePoint.

TypeScript NodeJS PostgreSQL Effect Ts AWS Anthropic OpenAI MCP Google Drive SharePoint AI Agents Tool calling Concurrency Control Error Handling CSV Excel

Technical Lead Developer

SoftServe

Apr 2025 - Feb 2026 (10 months)

Led backend and frontend teams in the design and scaling of Node.js/NestJS microservices. Architected clean, modular APIs, established engineering standards, and mentored engineers.

NodeJS NestJS Microservices API Design CI CD cloud deployment Code Review Test Strategy Go Concurrency System Design Stakeholder Management

Senior Backend Developer (Discipline Lead) CL

Endava

Jul 2021 - Mar 2025 (3 years 8 months)

Architected a decentralized multimedia system handling millions of concurrent requests and modernized core banking systems by breaking down monoliths into microservices. Led the Node.js technical community and served as Discipline Lead for backend engineers.

NodeJS Microservices Database Migration Distributed Systems System Design Mentorship Technical Leadership Banking Insurance Multimedia Healthcare

Senior Developer BFSI US SE &LATAM

Tata Consultancy Services

Feb 2020 - Jul 2021 (1 year 5 months)

Led backend development teams for large-scale projects in banking, financial services, and insurance across LATAM and US markets. Designed and optimized distributed backend services and migrated legacy systems to cloud-ready architectures.

Backend Development Distributed Systems Cloud Migration API Development Integration Mentorship Stakeholder Management Banking Financial Services Insurance

Software architect

CosmicGo

Jan 2019 - Feb 2020 (1 year 1 month)

Led the design and implementation of the backend architecture for the Cosmic application using Node.js. Architected a multitenant web application, designed PostgreSQL schemas, and developed microservices for mobile apps.

NodeJS PostgreSQL Microservices REST APIs Angular Git Flow Multi tenant architecture Database Design Android iOS

Full Stack developer

City of EDEN

Sep 2018 - Dec 2018 (3 months)

Designed and structured backend services for the Cosmic application using Node.js. Developed and deployed RESTful APIs in AWS with NGINX, created an admin dashboard using Angular 2, and implemented real-time geolocation tracking.