Senior BackEnd Engineer

This position is a full-time and fully remote position from Portugal

Axonius is seeking a Senior Backend Engineer to own the architecture and evolution of scalable Python-based microservices, data integrations, and core platform capabilities. In this role, you will act as a technical right-hand to the Engineering Team Lead, breaking down complex platform goals into structured execution roadmaps. You will collaborate across cross-functional teams to design, implement, and maintain high-performance backend systems using AsyncIO, FastAPI, and modern distributed data stores.

• Architect and scale end-to-end Python backend systems, microservices, and APIs using AsyncIO, FastAPI, Celery, MongoDB, and Redis.

• Lead end-to-end technical initiatives by breaking high-level platform goals into actionable sub-tasks, multi-phase delivery milestones, and backlog priorities.

• Build high-throughput integrations with external APIs, third-party software applications, and complex data sources.

• Collaborate with Product, Frontend, DevOps, and Security teams to establish decoupled software boundaries and risk-mitigated deployment strategies.

• 5+ years of software development experience specializing in backend systems architecture and distributed components.

• Hands-on proficiency in Python or C# with demonstrated expertise in clean code architecture, object-oriented design, and maintainable software patterns.

• Proven track record of leading technical projects from design through production deployment, including task breakdown, milestone planning, and risk mitigation.

• Practical experience designing and consuming RESTful APIs, asynchronous communication flows, and multi-tier data pipelines.

• Hands-on experience with AsyncIO, FastAPI, Celery, Docker, Linux, MongoDB, and Redis.

• Demonstrated experience handling complex data structures, graph-based data models, or enterprise network topologies.

• Proven experience modernizing legacy backend infrastructures with zero-downtime deployment strategies (e.g., canary rollouts, shadow testing).

• Prior experience acting as a technical team lead, focal point, guiding sprint planning, and mentoring junior/mid-level engineers.

#LI-AZ1 #LI-REMOTE

Axonius transforms cyber asset intelligence into actionability. With the Axonius Asset Cloud, customers preemptively tackle high-risk and hard-to-spot threat exposures, misconfigurations, and overspending. The integrated platform brings together data from every system in an organization’s IT infrastructure to optimize mission-critical risk, performance, and cost measures via actionable intelligence.

Covering cyber assets, software, SaaS applications, identities, vulnerabilities, infrastructure, and more, Axonius is the one place to go for Security, IT, and GRC teams to continuously drive actionability across the organization. Cited as one of the fastest-growing cybersecurity startups, with accolades from CNBC, Forbes, and Fortune, Axonius supports millions of assets for leading customers across industries and around the world.

Axonius makes it a priority to invest in our people with competitive compensation and benefits, growth opportunities, community-building, and so much more. Learn more about benefits at