Senior Software Engineer, Backend

Summary

Join Postscript, a leading SMS marketing platform trusted by over 18,000 Shopify stores, as a Senior Backend Engineer on the Conversations AI Team. You will leverage your expertise in OpenAI, LLMs, and RAG to build and refine AI systems that deliver personalized shopping experiences. This fully remote role offers the opportunity to influence how AI drives customer engagement and guide the team in crafting innovative solutions. You will architect, build, and maintain scalable APIs, integrate LLMs into the AI platform, and lead the design and deployment of backend systems on AWS. The position requires strong experience with OpenAI, LLMs, and RAG, along with proven experience in building and scaling backend systems. Postscript offers competitive compensation, equity, flexible paid time off, and comprehensive health benefits.

Requirements

• Strong experience working with OpenAI, LLMs, and RAG , with a passion for implementing cutting-edge AI-driven solutions
• Minimum 6-8 years professional software development experience, with 1-2 years at minimum in AI solutions
• Proven track record of building and scaling backend systems, ideally in high-growth or early-stage environments
• Expertise in Python (Flask, SQLAlchemy) and building robust, modular APIs, with a focus on extensibility and performance
• Deep understanding of relational databases, data modeling, and AWS architecture, with a focus on high observability and scalability
• Ability to lead app projects from conception to delivery, managing ambiguity, and driving results
• Experience mentoring and leading engineering teams, with a collaborative mindset and excellent communication skills
• Familiarity with modern frontend technologies (TypeScript, Lit Web Components) and a willingness to work across the stack as needed

Responsibilities

• Architect, build, and maintain scalable, high-performance APIs for our AI-driven conversational tools, ensuring seamless and efficient customer interactions via SMS
• Work closely with cross-functional teams to integrate LLMs, OpenAI models, and RAG techniques into our AI platform, driving personalized, real-time customer engagement
• Lead the design and deployment of highly available, modular, and scalable backend systems on AWS, using Python (Flask) and other modern technologies
• Innovate on acquisition tools that collect valuable customer data and contribute directly to the growth of our clients’ SMS subscriber lists
• Own the implementation of new AI features from start to finish, collaborating with product managers and designers to deliver customer-focused solutions
• Mentor and guide other engineers, fostering a culture of continuous improvement and learning
• Lead with technical excellence, balancing the need for immediate solutions with long-term scalability and maintainability

Preferred Qualifications

• You’re curious and enthusiastic—you love building things
• Energized by early stage companies and the opportunity to own and improve a new, fast-growing codebase
• You can drive technical decisions by measuring trade offs informed by both business priorities and technical needs
• You have empathy for users and enjoy helping others
• Bonus : Remote work experience. You love working on a remote-first team

Benefits

• Salary range of USD $170,000-$200,000 base plus significant equity (we do not have geo based salaries)
• High growth startup - plenty of room for you to directly impact the company and grow your career!
• Work from home (or wherever)
• Fun - We’re passionate and enjoy what we do
• Competitive compensation and opportunity for equity
• Flexible paid time off
• Health, dental, vision insurance