Principal Open Source Developer - TypeScript/Node/Angular/React/.NET

Motion Recruitment; Boston (MA); On-site; USD 170,000 - 210,000; Full time

Benefits offered by this job

Bonus OR Commission eligible

Medical Insurance

Dental Benefits

Vision Benefits

PTO

401(k) including match

Job summary

Motion Recruitment seeks a Principal Open Source Software Engineer in Boston to lead strategic technical direction across multiple open source projects. You'll combine hands-on software development with architectural ownership, guiding platform strategy and engineering excellence.

The role emphasizes .NET/C#, Angular/React, TypeScript, REST APIs, and scalable cloud-native solutions. You will mentor senior engineers, drive API and architecture decisions, and collaborate with stakeholders and the

Qualifications

• 10+ years of software engineering with .NET/C# and related tech.
• Deep expertise in Angular/React and front-end design.
• Strong REST API, SQL, and EF proficiency.
• Experience guiding large engineering initiatives in Agile setups.
• Open source leadership and collaboration across teams.

Responsibilities

• Drive hands-on development across open source products and platforms.
• Design scalable solutions using .NET and C#.
• Provide technical direction for front-end via Angular/React.
• Define API strategy, development, and integration initiatives.
• Lead architecture reviews and critical decisions.
• Establish engineering best practices and mentor engineers.
• Support cloud-native development and modernization efforts.
• Evaluate community contributions and proposals.
• Partner with leadership to shape roadmaps and platform strategy

Skills

NET/C# expertise

Angular

React

TypeScript/JavaScript

REST API development

SQL/Database design

Entity Framework

Agile leadership

Open source leadership

Tools

Azure

AWS

Kubernetes

Docker

CI/CD pipelines

Job description

Job Description

We are seeking a Principal Open Source Software Engineer to provide strategic technical leadership across a growing portfolio of open source products and platforms. This role combines hands-on software engineering expertise with high-level architectural ownership, driving engineering excellence, technology direction, and long-term platform strategy across multiple initiatives.

Job Description

We are seeking a Principal Open Source Software Engineer to provide strategic technical leadership across a growing portfolio of open source products and platforms. This role combines hands-on software engineering expertise with high-level architectural ownership, driving engineering excellence, technology direction, and long-term platform strategy across multiple initiatives.
The ideal candidate will have deep expertise across .NET, C#, Angular, React, and TypeScript, along with a proven track record of leading large-scale engineering efforts and influencing technical decisions across organizations. You will collaborate with internal stakeholders and the broader open source community to deliver scalable, secure, and highly available software solutions while shaping the future direction of our technology ecosystem.

Required Skills & Experience

• 10+ years of software engineering experience with .NET and C#
• Strong experience with Angular and/or React
• Advanced TypeScript and JavaScript expertise
• Extensive REST API development experience
• Strong database design and SQL development skills
• Experience working with Entity Framework
• Proven experience driving technical strategy and leading complex engineering initiatives within Agile environments

Desired Skills & Experience

• Experience with .NET Core and .NET 8
• Azure, AWS, or Kubernetes experience
• Strong microservices architecture experience
• Experience building CI/CD pipelines and DevOps processes
• Docker and containerization expertise
• Open source maintainer or contributor experience
• Experience mentoring senior engineers and providing technical leadership across multiple teams

Daily Responsibilities

• Drive hands-on development efforts across open source products and platforms
• Design and implement scalable solutions using .NET and C#
• Provide technical direction for front-end development using Angular or React
• Define and oversee API strategy, development, and integration initiatives
• Lead architecture reviews and guide critical technical decision-making
• Establish, evolve, and champion engineering best practices across teams
• Support cloud-native application development and modernization initiatives
• Evaluate community contributions and technical proposals
• Mentor senior engineers and provide cross-team technical leadership
• Partner with product and engineering leadership to shape technology roadmaps and long-term platform strategy

The Offer

• Bonus OR Commission eligible

You will receive the following benefits

• Medical Insurance
• Dental Benefits
• Vision Benefits
• Paid Time Off (PTO)
• 401(k) {including match – if applicable}

Applicants must be currently authorized to work in the US on a full-time basis now and in the future.

Posted By

Liam Turner