SENIOR FULLSTACK IOT ENGINEER

Reply Group; Katowice; On-site; PLN 279,000 - 390,600; Full time

Benefits offered by this job

Medical Care

Benefits Platform

Language Courses Platform

Company Events

Motivizer Benefits Platform

Regular training opportunities

Networking events

Job summary

Reply Group is seeking a skilled backend and cloud engineer in Poland. You'll design and evolve IoT and cloud architectures at OBI Smart Technologies Poland, working across device communication, telemetry processing, and automation workflows.

Your role involves developing scalable backend services using TypeScript, Node.js, and handling AWS environments. The ideal candidate has 5+ years of backend engineering experience, a solid grasp of REST APIs, and fluent communication skills in English and Polish.

Qualifications

• 5+ years of professional experience in backend engineering with strong expertise in TypeScript and Node.js.
• Strong hands-on experience with NestJS and designing scalable REST APIs in production environments.
• Deep experience with AWS cloud services including IoT Core, Lambda, Kinesis, SQS, Timestream, IAM, and CloudWatch.
• Ability to translate complex business requirements into scalable technical solutions.

Responsibilities

• Design and develop scalable backend services using TypeScript, Node.js, NestJS, and Fastify.
• Lead the design and evolution of REST APIs using OpenAPI standards.
• Build scalable data processing and automation workflows for telemetry data.
• Drive engineering best practices, observability, reliability and security standards.

Skills

TypeScript

Node.js

NestJS

AWS IoT Core

Kubernetes

REST APIs

Terraform

PostgreSQL

GitLab CI/CD

MQTT

Education

Completed university degree in Computer Science

Tools

AWS

Fastify

Timestream

SQS

Job description

We are looking for a strong backend and cloud engineer with deep experience in IoT and distributed systems who wants to shape and scale modern cloud-native platforms.

You will design and evolve IoT and cloud architectures at OBI Smart Technologies Poland, working across device communication, telemetry processing and automation workflows. You act as a technical driver within the team, contributing to architecture decisions and ensuring scalable, secure and production-ready solutions across AWS environments.

Your key responsibilities include:

• Design and develop scalable backend services using TypeScript, Node.js, NestJS and Fastify within distributed systems.
• Lead the design and evolution of REST APIs using OpenAPI standards and robust validation and versioning strategies.
  Design and operate AWS-native IoT and event-driven architectures using IoT Core, MQTT, Lambda, Kinesis and related services.
• Build scalable data processing and automation workflows for telemetry and energy-related data using Timestream, SQS and streaming services.
• Design and optimize persistence layers using PostgreSQL or Aurora and ensure data consistency and performance.
• Own infrastructure and deployment design using Terraform or OpenTofu, Kubernetes, Helm and GitLab CI/CD pipelines.
• Drive engineering best practices, observability, reliability and security standards while supporting GDPR-related backend processes and mentoring team members.
• Medical Care
• Benefits Platform
• Language Courses Platform
• Company Events
• Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more.
• Language Courses –you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones!
• Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development.
• Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions.

Qualifications

• Completed university degree in Computer Science or a comparable technical field.
• 5+ years of professional experience in backend engineering with strong expertise in TypeScript and Node.js.
• Strong hands-on experience with NestJS and designing scalable REST APIs in production environments.
• Deep experience with AWS cloud services including IoT Core, Lambda, Kinesis, SQS, Timestream, IAM and CloudWatch.
• Strong experience with infrastructure as code, Kubernetes, containerization and CI/CD pipelines.
• Solid understanding of distributed systems, event-driven architectures and IoT communication patterns such as MQTT.
• Ability to translate complex business requirements into scalable technical solutions.
• Fluent communication skills in English and Polish and availability to work in a hybrid mode with 1–2 office visits per week.