Senior Backend Developer

Senior Backend Developer
Porto
Porto, Porto District, Portugal

Overview

Join to apply for the Senior Backend Developer role at ISS A/S

As a global leader in facilities services we connect people and places to make the world work better. Whether directly or indirectly, you’ll play a vital role in supporting our placemakers in delivering exceptional workplace experiences for our customers. Together, we make space for people and businesses to thrive.

Want to know how a facility management company is powered by technology?

At ISS Tech Team we are investing in innovative and integrated technological solutions for the facility management industry with a tech team headquartered in Copenhagen, Warsaw and Porto. Our Porto hub is the first space dedicated specifically to software development and acts as a powerhouse where our employees test and implement products for over 40, 000 clients and 350, 000 placemakers around the world.

Job Role

We’re looking for a Senior
- focused Software Developer who’s passionate about building scalable, reliable systems that power our Io
T platform. You’ll work on core services that connect thousands of devices, process data in real time, and help deliver smarter workplace experiences worldwide.

You’ll work mainly with. NET and/or Node. js (Type
Script), designing APIs, building distributed services, and ensuring performance, security, and resilience at scale. You’ll collaborate with Dev
Ops and product teams to design solutions that run smoothly in production and evolve with our platform.

We value engineers who think about architecture, automation, and
- term reliability, not just code that works today. If you enjoy solving complex backend challenges in a real Io
T environment, this is where you can make an impact.

Location: Porto, Portugal

Work Model: Hybrid

What you will do

• Build and maintain backend services and APIs using either. NET (C#) or Java
  Script/Type
  Script (Node. js).
• Design scalable, maintainable, and testable solutions that support real business needs.
• Collaborate with product managers, frontend engineers, and other stakeholders to deliver
  -
  - end features.
• Write clean,
  - documented code and participate in code reviews.
• Help shape our architecture and technical direction—your voice matters here.
• Troubleshoot, debug, and optimize systems for performance and reliability.
• Stay up to date with new tech and best practices, and share your knowledge with the team.

What you’ll work with

You’ll join a collaborative,
- functional team of software engineers, product owners, and business stakeholders. You’ll work closely with colleagues who value open communication, practical solutions, and continuous learning. Expect to interact with both technical and
- technical team members, and to have your ideas heard and respected.

What makes you fit

• 5+ years of experience designing and building backend systems using. NET (C#) or Node. js with Type
  Script.
• Deep understanding of API architecture, distributed systems, and modern backend patterns such as microservices and
  - driven design.
• Proven experience working with both relational and No
  SQL databases (SQL Server, Postgre
  SQL, Mongo
  DB) and optimizing data flows at scale.
• Strong background in
  - native development (preferably Azure or AWS) and experience with CI/CD automation and observability.
• Skilled in writing reliable, testable code and implementing robust automated testing practices.
• Comfortable leading technical discussions, performing code reviews, and influencing architecture decisions.
• Pragmatic
  - solver who values scalability, maintainability, and
  - term impact over quick fixes.
• Excellent communicator who can bridge technical and business perspectives effectivelyli>
• Advanced English proficiency, with strong written and verbal communication skills.
• Driven by outcomes and accountability, with a strong sense of ownership over the systems you build.
• Collaborative and
  - focused, able to guide discussions and align teams around technical decisions.
• Detail-oriented and
  - driven, balancing speed with
  - term maintainability.
• Adaptable and composed under pressure, comfortable leading through change and uncertainty.

What we offer

• 22 days of annual leave per year +3 company leave days.
• Flexible working hours & hybrid work model.
• Permanent contract.
• Health Insurance (employee).
• Modern,
  - equipped office in the heart the city of Porto.
• Free parking.
• ISS Tech Communities (Sports, Gaming & Band).
• Free access to company Gym.
• Snacks and drinks at the office.

Why ISS

At ISS, we are more than just a service provider of cleaning, food, workplace and technical services, we are a partner in our customers’ success. By creating exceptional service moments and transforming workplaces into spaces where employees feel valued, engaged and productive, we enhance productivity and help our customers to attract talent and grow their businesses. This begins with our own people through training, career development, and a supportive culture – empowering them to deliver outstanding service. We know that when our people thrive, they create spaces where our customers’ employees and businesses thrive too.

ISS is a Place to Be You. Be who you are. Become what you want. Be part of something bigger. Become more. Become ISS.

ISS seeks to BE a place of belonging and CREATE places where every person is welcomed, embraced, and valued for exactly who they are. Places where people feel safe, respected, represented, and supported as their authentic selves.