Staff Software Engineer | AI

affinipay1; United States; Hybrid; USD 66,000 - 111,000; Full time

Benefits offered by this job

Hybrid work model

Founding engineer Brno hub

Occasional travel

Job summary

affinipay1 is seeking a Staff Software Engineer to lead the design and delivery of AI-powered features across its SaaS product suite. The role is part of a new Brno-based R&D hub with two in-office days weekly, collaborating with product, data, and cloud teams.

You will design AI capabilities end-to-end, from ideation to production, and help shape the infrastructure and deployment practices for scalable AI.

Qualifications

• Five+ years of professional software engineering experience in SaaS or backend development.
• Proven track record designing, building, and operating production AI/ML services.
• Hands-on experience with LLM frameworks and modern developer tooling.

Responsibilities

• Translate business challenges into AI-driven solutions with product stakeholders.
• Design, build, and integrate AI features into SaaS products used by professionals.
• Collaborate with data team to collect and prepare data for model training and inference.
• Develop AI-powered services from prototypes to GA for customers.
• Write production-grade Python for data manipulation and model evaluation.
• Build tooling and infrastructure for reliable, scalable AI deployment.
• Work with cloud operations to ship, monitor, and improve AI features in production.

Skills

Full-stack SaaS

Python

LLM frameworks

AWS

Education

Bachelor's degree or higher in CS/Engineering

Tools

Python

LLM frameworks

Job description

Role overview

A professional business platform serving legal, accounting, and other client-focused firms is hiring a Staff Software Engineer to lead the design and delivery of AI-powered features across its SaaS product suite. The role sits inside a newly forming R&D hub and offers the chance to shape AI capabilities end-to-end, from ideation through production, while partnering closely with product, data, and cloud operations teams. Work is hybrid, based near Brno with two days per week in the office, and the position is engaged through an Employer of Record partner in the Czech Republic.

Responsibilities

• Partner with product managers and stakeholders to translate business challenges into well-scoped AI-driven solutions.
• Design, build, and integrate AI features into existing SaaS products used by hundreds of thousands of professionals.
• Collaborate with the data team on collecting, enriching, preparing, and staging data suitable for model training and inference.
• Develop and evaluate AI-powered services from early prototypes through full general availability to customers.
• Write production-grade Python for data manipulation, LLM interaction, and model performance evaluation.
• Build the tooling and infrastructure needed for reliable, scalable, and secure AI deployment.
• Work alongside cloud operations to ship, monitor, and continuously improve AI features in production.

Requirements

• Five or more years of professional software engineering experience, ideally in full-stack SaaS or backend development.
• Proven track record of designing, building, and operating production AI/ML services.
• Hands-on experience with LLM frameworks, platforms, and related developer tooling.
• Strong Python or comparable modern language skills, with comfort working across data and evaluation workflows.
• Experience building scalable data infrastructure and integrating models into broader SaaS systems.
• Familiarity with AWS or equivalent cloud environments and modern DevOps practices.
• Located near Brno and willing to work on-site two days per week with the local team.

Nice to have

• Bachelor's degree or higher in Computer Science, Engineering, or a related technical field.
• Experience fine-tuning and optimizing Large Language Models.
• Experience integrating AI into streaming or real-time data flows.
• Background in Natural Language Processing.
• Exposure to fintech or the legal industry.

Benefits and work setup

• Monthly gross salary range of CZK 130,000 to CZK 220,000, with final pay based on skills, experience, and education.
• Opportunity to be a founding engineer of a new Brno R&D hub, collaborating with U.S.-based teams during an initial integration period before forming locally-led autonomous squads.
• Clear paths to Staff and leadership roles, with face-to-face collaboration once the new Brno office opens.
• Hybrid working model with two in-office days each week to connect with the team.
• Occasional travel for company events, including potential U.S. visits.
• Engaging local culture with team events, outings, wellness initiatives, learning programs, and company swag.