Senior Software Engineer

Founded in 1995, Atrium is a WBENC‑certified leader in Extended Workforce Management and Talent Solutions, blending technology and human expertise to help leading brands reimagine how work gets done. Atrium delivers its market-leading solutions through four divisions: Talent Solutions, AtriumWORKS™, HR Advisory Services, and Atrium Innovation Research™ (AIR). All offerings integrate seamlessly to create flexible programs built for the evolving world of work.

About AIR at Atrium:

Atrium Innovation Research (AIR) is where early stage ideas and applied research become products. The AIR Incubator is a hands-on venture studio: small, cross-functional teams take promising concepts, many rooted in emerging AI and machine learning work, and move them from a hypothesis to a validated, revenue-ready product. We operate with the urgency of a startup and the resources of an established organization, running several bets in parallel and doubling down on the ones that show real traction.

Position Overview:

Atrium is seeking a Senior Software Engineer to take AIR products from early stage seeds to enterprise ready. Our current full-stack developer gets products to MVP and V1 quickly. You will pair with them on that speed, then own what comes next: security, scalability, reliability, and the deployment practices enterprise clients expect.

This is a hands-on role. You will write code daily, set the engineering bar for the team, and use AI coding tools as a core part of how you build. You will get the autonomy of a startup with the support of an established research organization, including real budget, senior partners, and a mandate to build something new, and your work will directly shape which ventures get launched.

• Harden MVPs for production by refactoring prototype code, defining clean architecture, and deliberately paying down technical debt
• Design for scale with multi-tenant data models, performance tuning, caching, queuing, and horizontal scaling
• Own security, including authentication and authorization (SSO/SAML, OAuth, RBAC), secrets management, encryption, and secure handling of candidate and worker PII
• Prepare products for enterprise security reviews and compliance frameworks such as SOC 2
• Stand up and own cloud infrastructure, infrastructure-as-code, CI/CD pipelines, environments, release management, monitoring, alerting, and incident response
• Build reliable integrations with enterprise systems, including VMS platforms (Beeline, SAP Fieldglass, VNDLY), ATS, and HRIS
• Build new features and help take new products from concept to MVP alongside our product developer
• Use AI coding tools daily (Claude Code, Cursor, Copilot, or similar) and build AI-powered features with LLM APIs
• Set engineering standards, including code review, testing, documentation, and guardrails that let a small team move quickly without breaking things
• Mentor teammates and advise on build-versus-buy and architecture decisions

• 8+ years of professional software engineering, including 3+ years building and running production SaaS used by business customers
• Strong full-stack skills in a modern stack, such as TypeScript/Node.js or Python on the back end and React on the front end
• Hands-on experience deploying and operating on a major cloud (AWS, Azure, or GCP), including containers, infrastructure-as-code (Terraform or similar), and CI/CD
• Solid grounding in application security: OWASP Top 10, identity and access management, data protection, and secure SDLC practices
• Experience designing multi-tenant systems and relational databases (PostgreSQL or similar) that scale
• Daily, practical use of AI coding assistants, and experience integrating LLM APIs into products
• Comfort moving between rapid prototyping and disciplined production engineering, with judgment about which a situation calls for
• Clear communication with non-engineers, including product leaders and clients

Nice to Have:

• Experience taking a product through SOC 2 Type II, ISO 27001, or enterprise vendor security questionnaires
• HR tech, staffing, or workforce management background, especially VMS, ATS, or payroll integrations
• Experience building with AI agents, retrieval-augmented generation (RAG), or MCP-based tool integrations
• Experience with data pipelines and analytics workloads
• Prior work at an early-stage startup or internal incubator

• Ability to sit for extended periods of time
• Ability to work in a hybrid work environment in our Jacksonville office

• Bachelor's degree in Computer Science or a related field, or equivalent practical experience

Atrium offers a comprehensive Atrium Care Package, available upon eligibility, including:

• 20 days of Paid Time Off (PTO)
• 11 paid holidays
• Medical, Dental, and Vision Insurance
• Health Savings Account (HSA) & Flexible Spending Accounts (FSA)
• Pet Insurance
• Legal Benefits
• 401(k) Program with employer match
• Employee Assistance Programs

Employee Perks:

• Summer Fridays
• Vibrant company culture with monthly events and in-office amenities
• Employee Wellness Programs
• Employee Discounts through Working Advantage
• Professional Development Opportunities
• Commuter Benefit Program

As a woman-owned firm, we value diversity. We are an equal opportunity and affirmative action employer and will consider all applications without regard to race,sex (including gender, pregnancy, sexual orientation, and gender identity), age, color, religion or creed, national origin or ancestry, veteran status, disability (physical or mental),genetic information, citizenship or any other characteristic protected by law.
We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions,and to receive other benefits and privileges of employment. Candidates who apply for roles through the Atrium website will be added to our candidate pool and may be consideredfor additional roles of a similar title. Please contact us to request an accommodation.
EOE/M/F/D/V/SO