About Aries

Aries is a rapidly-scaling, next-generation software group purpose-built to scale founder-led, mission-critical SaaS companies at the heart of the $50B+ cloud ecosystem. We unify niche B2B SaaS businesses under Aries' AI and Growth Platform - unlocking visibility, velocity, and value across our portfolio. With a permanent capital base and ~$200M invested annually, we’re building a new model for software scale focused on long-term value.

The Role: Senior Software Engineer

As a Senior Software Engineer on the core Aries engineering team, you’ll play a key role in designing and building the foundational systems that power our platform — enabling fast iteration, deep visibility, and scalable growth across our SaaS portfolio.

This is a hands-on role for a technical builder who’s excited to solve high-leverage challenges, prototype experimental tools, and contribute meaningfully to our engineering culture. You’ll work alongside a small, senior team and collaborate closely with product, data, and AI functions.

What You’ll Do:

• Build Core Infrastructure: Design and develop internal tools, APIs, and agents that integrate data, systems, and workflows across our SaaS group.

• Prototype with Purpose: Quickly turn high-level ideas into working products and iterate based on business feedback.

• Engineer Growth Systems: Build tools that support GTM agents, automate workflows, and enable better decision-making at scale.

• Collaborate Cross-Functionally: Work closely with product managers, data scientists, and AI engineers to deliver real business impact.

• Integrate & Stitch Systems: Connect 3rd-party APIs and internal services via clean interfaces and stateful pipelines.

• Champion Code Quality: Write clean, maintainable, well-tested code while mentoring others on engineering best practices.

What We’re Looking For:

• 4+ years of experience building backend systems, AI agents, APIs, or infrastructure in modern programming languages (Python, Ruby-on-Rails, TypeScript, Go, etc.)

• Comfortable working in fast-paced environments with shifting priorities and high autonomy

• Experience building integrations, internal tools, or platform services

• Strong product sense: you care about what you’re building and how it helps the business

• Solid understanding of system design, async workflows, and cloud infrastructure (bonus: experience with agent-based architectures or state machines)

• Enthusiastic about learning, growing, and collaborating across disciplines

Why This Role?

• Join an elite founding engineering team with massive ownership and impact

• Build real systems used across a portfolio of profitable SaaS companies

• Work at the frontier of product, data, AI, and growth — all in one environment

• Help shape the culture and direction of a fast-moving, well-funded platform business

Let’s Build

If you’re excited by the idea of building from 0→1, solving real-world problems, and shaping a world-class engineering org — we’d love to hear from you.

Apply now or reach out for an informal chat.