Sr. Software Engineer, Security

ArcTern Ventures; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Compensation & equity

Benefits

Office near transit

Culture & events

Flexible schedule

Job summary

SPAN, headquartered in San Francisco, is seeking a hands-on, autonomous Sr. Software Engineer, Security to drive SPAN’s software security initiatives across the platform and backend ecosystem.

You will architect, develop, and deploy security tooling and infrastructure, lead vulnerability remediation, and oversee cloud security hardening in AWS. Ideal candidates have 6+ years in security engineering, strong IAM knowledge, and production-grade backend experience in Python, Java, or Node.

Qualifications

• 6+ years in security engineering, application security, or DevSecOps.
• Strong understanding of IAM protocols (OIDC, SAML, OAuth).
• Expertise securing AWS environments and cloud infrastructure.
• Production-grade coding in Python, Java, or Node.
• Ability to architect security tooling and DevSecOps pipelines.

Responsibilities

• Design and build automated security tools and guardrails for developers.
• Triage and remediate vulnerabilities across the backend stack.
• Lead cloud security hardening for AWS production environments.
• Conduct threat modeling and security reviews for new features.

Skills

Security engineering

DevSecOps

IAM protocols

AWS security

Backend programming

Job description

Our Mission

SPAN is enabling electrification for all

SPAN is mission-driven to design, build, and deploy products that electrify our built environment, decarbonize our world, and slow the effects of climate change.

• Decarbonization is the process to reduce or remove greenhouse gas emissions, especially carbon dioxide, from entering our atmosphere.

• Electrification is the process of replacing fossil fuel appliances that run on gas or oil with all-electric upgrades for a cleaner way to power our lives.

• Enabling homes and vehicles powered by clean energy

• Making electrification upgrades possible

• Building more resilient homes with reliable backup

• Designing a flexible and distributed electrical grid

At SPAN, we believe in:

The Role

SPAN is seeking a hands-on, autonomous Sr. Software Engineer, Security. In this role, you will drive the technical execution of SPAN’s software security initiatives. You will architect, develop, and deploy the foundational security tools, frameworks, and infrastructure required to protect SPAN's platform and backend ecosystem.

Key Responsibilities:

• Foundational Tooling & DevSecOps: Design and build automated security tools, paving the way for self-service security guardrails that empower developers without sacrificing velocity.

• Vulnerability Remediation: Drive the triage and resolution of security vulnerabilities across our backend stack—directly writing code to patch CVEs yourself when needed, while partnering with engineering teams to architect broader, deeper structural fixes.

• Cloud Security Hardening: Serve as the technical lead for hardening our AWS production environments, ensuring top-tier alignment with modern industry standards and compliance.

• Threat Modeling & Risk Mitigation: Conduct deep-dive threat modeling and security architecture reviews for high-impact, complex systems and net-new platform features.

About you

• Experience: 6+ years of dedicated experience in security engineering, application security, or DevSecOps

• Identity & Access Management: Understanding of authentication and authorization protocols (OIDC, SAML and OAuth).

• Cloud Infrastructure: Expertise in securing, auditing, and hardening cloud ecosystems, with a strong emphasis on AWS environments.

• Vulnerability Resolution: Experience balancing tactical, fast-paced vulnerability patching with strategic, framework-level remediation alongside development teams.

• Software Engineering Roots: Proficient in writing production-grade code in at least one of our core backend languages: Python, Java or Node.

Life at SPAN

Headquartered in San Francisco’s vibrant SoMa neighborhood, we are an eclectic group of creative thinkers who value open communication, teamwork, and a ‘make it happen’ approach to addressing complex challenges.

SPAN embraces diversity and equal opportunity in a serious way. We are committed to building a team that represents a variety of backgrounds, perspectives, and skills.

We’re hiring talented individuals who are driven by success and are passionate about shaping the future of renewable energy. If that sounds like you, we’d love for you to consider joining the rapidly growing team at SPAN.

The Perks:

• Competitive compensation + equity grants at a well-funded, venture-backed company
• Comprehensive benefits: 100% employee premiums for base plans on medical, dental, vision with options for additional coverage. Parental leave up to six (6) months depending on eligibility
• Comfortable, sunny office space located near BART and Caltrain public transit
• Strong focus on team building and company culture: Employee Resource Groups, monthly social events, SPANcakes recognition breakfast, lunch and learns
• Flexible hours, one holiday per month and unlimited PTO