AI-Driven TS/Node.js Backend Engineer (AdTech)

Sigma Software; Wrocław; Remote; PLN 180,000 - 240,000; Full time

Job summary

Sigma Software is seeking a Middle/Senior AI & Back-End Developer to help transform a Sweden-based AdTech product into a modern AI-enabled platform. The role is remote-friendly, with a focus on building scalable, API-first microservices using TypeScript/Node.js, AWS serverless technologies, and AI integrations.

You will collaborate with international teams on reusable libraries, data isolation, and AI-driven optimization, contributing to a Platform-First architecture powered by OpenAI APIs,

Qualifications

• 7+ years of commercial experience as a Back-end Developer.
• Strong hands-on experience with TypeScript and Node.js.
• Practical experience integrating AI services, LLM APIs, or AI-assisted workflows.
• Hands-on experience with AWS serverless technologies including Lambda, API Gateway, DynamoDB, and EventBridge.
• Understanding of RESTful and GraphQL APIs.
• Knowledge of prompt engineering concepts and AI integration approaches.
• Understanding of multi-tenant architectures and logical data isolation principles.
• Interest in AdTech products, automation, and AI-driven optimization.
• Upper-Intermediate or higher English level.

Responsibilities

• Develop and maintain high-performance Back-end microservices and AI-enabled services using TypeScript and Node.js.
• Design, implement, and integrate AI and LLM-powered platform features.
• Build scalable serverless solutions using AWS Lambda, API Gateway, DynamoDB, and EventBridge.
• Collaborate with cross-functional teams on API-first architecture and OpenAPI specifications.
• Ensure tenant data isolation and compliance with established AdTech data models.
• Contribute to reusable libraries, templates, AI integration patterns, and engineering standards.
• Participate in code reviews focused on performance, reliability, observability, and service quality.
• Translate product and AI feature requirements into scalable technical solutions.
• Support the platform transformation toward automation, standardization, and intelligent reusability.
• Contribute to continuous improvement initiatives and technical decision-making processes.

Skills

TypeScript

Node.js

AI integration

LLM APIs

Prompt engineering

Multi-tenant architecture

English proficiency

Tools

AWS Lambda

API Gateway

DynamoDB

EventBridge

OpenAI APIs

GraphQL

REST APIs

Terraform/CloudFormation

Vector Databases

Job description

Sigma Software is seeking a Middle/Senior AI & Back-End Developer to help transform a Sweden-based AdTech product into a modern AI-enabled platform. The role is remote-friendly, with a focus on building scalable, API-first microservices using TypeScript/Node.js, AWS serverless technologies, and AI integrations.

You will collaborate with international teams on reusable libraries, data isolation, and AI-driven optimization, contributing to a Platform-First architecture powered by OpenAI APIs,