Senior Backend Engineer

About Lifesum

Used by over 65 million people globally, Lifesum is an AI-powered nutrition platform that helps people make smarter food choices and build sustainable, long-term habits. From improving focus and energy to managing weight and overall wellbeing, Lifesum provides personalized meal plans, recipes, and tracking tools that fit every lifestyle. Learn more at www.lifesum.com

We’re looking for a Senior Backend Engineer to help design, build, and scale the services that power our platform.

Note: This role is on-site. You’ll be based at our Stockholm headquarters at Repslagargatan 17, Södermalm, working in a hybrid setup.

What You'll Do

• Design and ship backend services on our Go, Postgres, and Kinesis stack.
• Work across a broad surface area, from high-throughput ingestion pipelines to payment and entitlement systems to AI-backed personalisation.
• Partner day-to-day with product managers, designers, mobile engineers, and data to turn fuzzy problems into well-scoped services, and make sure what you ship actually lands with users.
• Use AI coding agents as a first-class part of your workflow, champion improvements to our internal skills library, and help raise the bar for how the team works with them day to day.
• Own features end-to-end from RFC through production, including the observability, alerting, and documentation that come with a grown-up service.
• Mentor peers, push back on weak design, and help shape our tech radar.

Who you areYou've operated at senior level in a high-growth environment and care about craft as much as velocity. You're a generous collaborator - the kind of engineer people want in the room when things get hard - and you communicate clearly in writing and in person. You're comfortable pushing back, comfortable being wrong, and comfortable shipping.

• Expert at building backend systems in Go, ideally in a microservice or modular-monolith context. Comfortable reaching for another language when the problem calls for it (we have some legacy Python hanging around).
• Strong with event-driven architectures. We use Kinesis heavily; prior exposure to event sourcing & CQRS is a real plus.
• Comfortable on AWS, with Kubernetes (we run EKS) and infrastructure as code.
• You use AI coding agents in your daily work - we’ve standardised on Claude Code - and can speak to how you structure context, critique outputs, and keep the feedback loop tight. The use of AI assistants is not optional.
• Strong communicator across disciplines. You can write a clear RFC, argue its merits with engineers and non-engineers alike, and commit gracefully if a different direction is chosen.
• Genuinely curious about the problem, not just the code. You want to know why a feature matters to users, not just what to build.

Nice to have

• Experience with payments, subscriptions, or entitlement platforms.
• Background in a regulated domain - health (GDPR Article 9), finance (PCI), or similar.
• Distributed tracing and observability experience.
• Scale-up or startup experience - you know what "good enough" looks like at different stages.

Life at LifesumYou’ll be part of a purpose-led company redefining the future of digital health and nutrition. We move fast, work together, and create space for your ideas to thrive — with real impact, every single day. And because health and wellbeing are our mission, we live it too.

At Lifesum, you'll find:

• Hybrid work setup with our HQ in Stockholm
• Fast decision-making and real ownership — less bureaucracy, more impact
• A culture of curiosity — collaboration and engagement
• Shared wellbeing experiences — cook, train, and prioritize your health together
• Comprehensive benefits — private health insurance, personal development budget, generous wellness allowance, and more

Base salary range: TBD (Depending on experience and role scope)

Start date: As soon as possible.

We review applications on an ongoing basis — don’t sleep on it!

Please note that we kindly decline inquiries from external recruitment agencies.