Software Architect at Extenda Retail

Extenda Retail; Stockholms kommun; On-site; SEK 1,500,000 - 2,100,000; Full time

Job summary

Extenda Retail is seeking a Senior Software Architect to act as the technical authority for the Checkout Engine. This hands-on leadership role combines software architecture with POS domain expertise, ensuring a fast, fault-tolerant, and scalable platform for global retail loads.

The position features up to 50% hands-on coding in Java, prototyping, and collaboration with teams to validate architectural decisions, starting with a 6-month Architectural Immersion phase to build deep technical

Qualifications

• Seasoned engineering leader who loves complex distributed systems.
• Strong background in retail/SaaS domain with POS understanding.
• Expert-level Java skills and modern architectural patterns.
• Experience mentoring teams and leading agile practices.

Responsibilities

• Define and own the architecture lifecycle of the Checkout Engine.
• Spend up to 50% of time prototyping and coding in Java; mentor teams.

Skills

Retail tech

Java architecture

Cloud native

Mentor leadership

Job description

At Hii Retail (by Extenda Retail), we aren't just building software, we are reshaping how millions of people around the world experience shopping every single day. Our cloud-native Hii Retail platform unifies the entire in-store and omnichannel experience on a single, modern foundation. Built on a modern, MACH-based architecture (Microservices, API-first, Cloud-native, Headless), our platform is hosted on Google Cloud Platform (GCP).

We build checkout apps for brands like ICA, Axfood, Plantagen, and Auchan, creating a modern retail software and we are building it for the next decade – not the last one. If you like tackling massive engineering challenges alongside a team that values agility, modern tech, and real-world impact, you'll feel right at home here.

Why should you join Extenda Retail?

Extenda Retail is the kind of place where people tend to stay longer than they planned to, not because of the perks, but because the work is real and the people around them are good. The culture is demanding, but in the right way: high expectations, genuine ownership and a shared interest in getting things right. The values (trust, care & innovation) aren't decorative. They show up in how decisions get made and how people treat each other when things get hard. There's a genuine care for the people here, not as a stated policy, but as something you actually feel. If you want a place to grow, be challenged, and do work that matters, this is it!

Why Your Work Matters

We provide the technical backbone for some of the world’s most recognized retail brands.

To give you an idea of the scale you'll be playing with:

• Global Reach: We power over 250,000 checkouts across 38 countries


• High Volume: Our systems process 2.4 billion receipts annually


• Deep Engagement: We manage 25 million daily loyalty transactions

The role

We are seeking a Senior Software Architect to serve as the technical authority for our Checkout Engine. This dual-focus role requires the strategic mindset of a Software Architect combined with the deep domain expertise of a Point of Sales (POS) Expert. You will be the primary driving force behind the engine's future design, ensuring our platform remains fast, fault-tolerant, and highly scalable under peak global retail loads.

This is a hands-on leadership position. As an engineering leader, you will spend up to 50% of your time assisting in coding, primarily in Java, building prototypes, and pairing with teams to validate architectural decisions.

Given the complexity of our domain, the role begins with a 6-month \"Architectural Immersion\" phase. This dedicated period allows you to dive deep into the codebase, master the Checkout Engine’s nuances, and earn the deep technical context required to confidently lead its long-term evolution.

Core Responsibilities

• System Architecture : Define and own the entire architectural lifecycle of the Checkout Engine. You will design a scalable, cost-optimized cloud platform, backed by multi-tiered offline failovers down to the individual workstation


• Hands-on Leadership: Spend up to 50% of your time prototyping, writing core Java (25) code, and reviewing critical features. You will mentor developers and guide teams through architectural transformations.


• Organizational Alignment: Act as a key voice in our cross-company Architecture Chapter. You'll use visual diagrams and clear narratives to align engineering teams, product strategy, and stakeholders around a unified technical vision.


• AI-Assisted Development: Champion and utilize AI agentic support in the software development process, guiding the team to leverage these tools for continuous learning, prototyping, and enhanced coding efficiency

What you bring

We are looking for a seasoned engineering leader who loves complex distributed systems. Ideally, you have:

• Deep Retail Tech Roots: A strong background in the retail/SaaS domain, with a solid understanding of POS environments and edge constraints


• Java (25) & Architecture Mastery: Expert-level Java skills paired with a deep understanding of modern architectural patterns (Microservices, Event-Driven architecture, etc.)


• Cloud Native Mindset: Deep familiarity with cloud ecosystems (ideally GCP) and a strong grasp of cost-efficient, scalable system design


• The Mind of a Mentor: 10+ years of engineering experience, with a track record of leading agile practices and helping developers grow'