Senior Software Architect / Staff Engineer (Rails, Python, Cloud)

We’re looking for a senior, hands-on software architect who can take technical ownership of a complex, production-grade system and evolve it pragmatically.

Our core product is a Rails + React application, surrounded by a growing set of Python-based services and infrastructure running on Kubernetes in AWS. This role is not about being a Rails purist. It’s about designing, building, and operating systems — and being comfortable going deep wherever the system needs attention.

You’ll work in a highly autonomous environment, collaborating closely with engineering, product, DevOps, and AI specialists, and helping shape both the technical architecture and how we build software.

About Fuzu

Fuzu builds and operates a career development platform that helps people accelerate their growth through career guidance, learning, and inspirational content, and supports AI-first organizations with remote workforces in developing and fine-tuning their models. To date, the Fuzu platform has supported more than 20 million users.

We personalize user experiences using expert- and AI-driven algorithms. Our team is distributed across Finland, Poland, Bulgaria, Ukraine, Kenya, and Nigeria, and our work has been recognized globally.

We believe strong products are built by engineers who take real ownership, think in systems, and care about long-term outcomes — not just shipping tickets.

What you’ll do

Architecture & Technical Ownership

• Take end-to-end ownership of a Rails + React core application and its surrounding services

• Design and evolve service boundaries, APIs, and data flows across a distributed system

• Make pragmatic architectural decisions balancing speed, correctness, scalability, and maintainability

• Partner with the Head of Engineering to guide technical direction

Hands-On Development

• Work directly in production code across Ruby on Rails, Python, and React as needed

• Design and implement backend features such as APIs, background jobs, and data pipelines

• Integrate AI- and ML-driven functionality into the platform (e.g. personalization, recommendations)

Cloud & Platform Engineering

• Contribute to systems running on Kubernetes in AWS

• Work with PostgreSQL, Redis, and Elasticsearch clusters

• Improve observability, performance, and operational reliability

• Participate in incident resolution and preventative improvements

Agentic & AI-Assisted Development

• Operate with high autonomy: identify problems, propose solutions, and drive execution

• Actively improve development workflows, including AI-assisted and agentic development practices

• Shorten feedback loops through automation, tooling, and pragmatic process improvements

Technical Leadership

• Evaluate feasibility, trade-offs, and ROI of technical initiatives

• Contribute to planning, discovery, and architectural discussions

• Produce clear technical documentation that supports independent and scalable development

What we’re looking for

Experience & Seniority

• 5+ years of professional software development experience

• Proven experience owning and evolving production systems

• Strong background in Ruby on Rails, with comfort working beyond it

Systems & Architecture Mindset

• Ability to reason about systems, failure modes, and long-term maintainability

• Comfortable working across multiple languages and services

• Experience with SaaS and/or high-growth environments is a plus

Technical Breadth

• Strong backend engineering skills

• Experience or working familiarity with:

  • React

  • Python services

  • PostgreSQL

  • AWS and Kubernetes

  • Redis and Elasticsearch

(You don’t need to be an expert in everything, but you must be able to navigate and improve systems like this.)

Agentic Way of Working

• Experience working autonomously in ambiguous environments or

• Strong motivation to work in an outcome-driven, agentic model, including:

  • Using AI tools as collaborators

  • Rapid experimentation and short feedback loops

  • Ownership over outcomes, not just tasks

Remote & Self-Directed

• Comfortable working remotely with high autonomy

• Able to self-prioritize, manage ambiguity, and surface risks early

• Strong written and verbal communication skills

What we offer

• Meaningful work on a platform impacting millions of users globally

• A senior, highly autonomous role with real technical ownership

• Exposure to AI- and ML-driven systems at scale

• Remote-first work with flexible hours

• Professional growth through onboarding, coaching, and continuous learning

• A diverse, international team across multiple continents

We strongly encourage candidates from all backgrounds to apply. Due to GDPR constraints, candidates must reside within the EEC and have an existing work permit.