Principal C#/.NET Architect - AWS & AI-Driven Platform

Greybridge Search & Selection; Washington (District of Columbia, MD); Hybrid; USD 200,000 - 240,000; Full time

Benefits offered by this job

Bonus

RSUs

Job summary

Greybridge Search & Selection is seeking a Principal Software Engineer to own architecture for large-scale tax compliance platforms. You’ll stay hands-on with C#/.NET Core on AWS, guiding teams across design reviews and implementation.

In this role, you’ll lead cloud-native migrations, shape the long-term technical roadmap, and explore practical AI/ML integrations in production products while mentoring engineers across multiple teams.

Qualifications

• 10+ years in software engineering, with proven Principal-level scope.
• Strong, recent, hands-on C#/.NET Core experience.
• Deep production AWS experience across services like EC2, S3, ELB, Auto Scaling, RDS, Lambda, SQS and containers.
• A track record of architecting and building large-scale distributed systems and microservices.
• Experience modernising complex legacy systems into cloud-native solutions.
• Strong grounding in architecture, OO design, algorithms, design patterns, APIs and relational databases.
• Excellent communication, able to influence across Product, Engineering, Security, QA, Data and Ops.
• Degree in Computer Science or a related field, or equivalent experience.

Responsibilities

• Own architecture and system design for complex, high-scale platforms, balancing scalability, reliability, performance and security.
• Build production software in C#/.NET Core on AWS, staying hands-on in design and delivery.
• Lead the move from legacy applications to cloud-native architectures: microservices, APIs, distributed systems and containerised workloads.
• Set technical direction and influence engineering decisions across teams.
• Mentor through design reviews, code guidance and best practice.

Skills

C#/.NET Core

AWS

Distributed systems

Microservices

Architecture design

OO design

APIs

Relational databases

Leadership

Communication

Education

Bachelor's degree in Computer Science

Tools

EC2

S3

ELB

Auto Scaling

RDS

Lambda

SQS

Container services

Job description

Greybridge Search & Selection is seeking a Principal Software Engineer to own architecture for large-scale tax compliance platforms. You’ll stay hands-on with C#/.NET Core on AWS, guiding teams across design reviews and implementation.

In this role, you’ll lead cloud-native migrations, shape the long-term technical roadmap, and explore practical AI/ML integrations in production products while mentoring engineers across multiple teams.