Software Development Engineer, Seller Economics & Fees

Are you an SDE II who thrives on end-to-end ownership gets energized by problems where correctness actually matters and wants to work on systems that are actively being reimagined and not just maintained This role might be for you.

On Fee Tech you will own systems that 2MM sellers depend on daily to understand predict and act on their economics. The work is genuinely end-to-end: you design build ship and operate. Our systems process 68.5B transactions and used across 23 countries. The engineering model is changing fast: we are rebuilding how fee policy is expressed deployed and validated using AI agents formal verification (SMT) and self-improving RL loops.

You will work alongside senior and principal engineers product managers applied scientists and ML engineers across the full fee lifecycle from the Fee Calculation Engine through ML-based item classification to seller-facing AI surfaces and the agentic infrastructure beneath them. If you are the kind of engineer who wants to see the direct impact of what you ship you will see it here.

Key job responsibilities
- Design and implement software solutions for major features and improvements balancing technical constraints with customer needs while ensuring scalability performance and security.
- Contribute across the full software development lifecycle including product definition system design coding testing deployment and operational support delivering incrementally and with high quality.
- Identify root causes of operational issues and implement permanent fixes continuously improving your teams systems and technical processes to reduce support costs and increase reliability.
- Mentor and coach fellow engineers through code reviews and knowledge sharing actively training new team members on system architecture operations and design decisions.
- Evaluate new technologies and approaches to solve problems using optimal data structures and algorithms making thoughtful recommendations for adoption while keeping solutions as simple as possible.
- Operate AI-native engineering practices: use AI-assisted coding multi-agent workflows and agentic code review tools as your default mode of software delivery.

A day in the life
You start your morning reviewing a pull request from a teammate offering feedback that strengthens both the code and the engineer behind it. After a quick standup you dive into designing a new feature sketching out how it fits into the broader system the afternoon you might pair with a colleague to debug a tricky production issue then document your findings so the team can learn from it. Throughout it all you collaborate closely with product partners to ensure what you build truly serves the customer.

- 3 years of non-internship professional software development experience
- 2 years of non-internship design or architecture (design patterns reliability and scaling) of new and existing systems experience
- 1 years of designing and developing large-scale multi-tiered multi-threaded embedded or distributed software applications tools systems and services using: C# C Java or Perl experience
- Bachelors degree or foreign equivalent in Computer Science Engineering Mathematics or a related field
- Experience programming with at least one software programming language

- 3 years of full software development life cycle including coding standards code reviews source control management build processes testing and operations experience
- Experience with Machine Learning and Large Language Model fundamentals including architecture training/inference lifecycles and optimization of model execution

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status disability or other legally protected status.

Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process including support for the interview or onboarding process please visit for more information. If the country/region youre applying in isnt listed please contact your Recruiting Partner.

The base salary range for this position is listed below. Your Amazon package will include sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience qualifications and location. Amazon also offers comprehensive benefits including health insurance (medical dental vision prescription Basic Life & AD&D insurance and option for Supplemental life plans EAP Mental Health Support Medical Advice Line Flexible Spending Accounts Adoption and Surrogacy Reimbursement coverage) 401(k) matching paid time off and parental leave. Learn more about our benefits at WA Seattle - 143700.00 - 194400.00 USD annually