Senior Software Engineer, C# PHP

Quick heads-up: If you’re applying from Wellfound, please head over to our Greenhouse job board to complete the full application form before submitting. This helps us make sure we get all the details we need to review your application properly. Thanks! FAST Group is one of the fastest-growing providers of parcel logistics services in the United States, bridging online and offline commerce—and everything in between. And we’re just getting started. Our leadership team brings a proven track record of building innovative small-package shipping and global logistics solutions. We’ve delivered world-class results for some of the most recognized brands across media, e-commerce, and retail. Over the past two years, FAST Group has quadrupled in size. With international partners routing their e-commerce deliveries through our network and new parcel sortation facilities launching across the U.S., the next phase of growth is even more explosive. We’re currently approaching $200 million in annual revenue, with aggressive targets to reach $500 million in the next 3–4 years—and ultimately become a billion-dollar organization within the next decade. To support this scale, we’re investing heavily in technology. Our engineering team is building a highly scalable platform using microservices architecture, Kubernetes, Redis, Kafka/RabbitMQ, and Azure-native cloud services. Over the coming years, we’ll be diving deep into warehouse automation, AI, ML, IoT, and advanced data technologies. FAST Group is the holding company for ACI Logistix, FirstMile, and Sendle, creating a dynamic logistics ecosystem that provides complete shipping services for businesses of all sizes.

About You:

At FAST Group, we’re hiring a Senior Full Stack Software Engineer with strong experience in both PHP and C#. You’ll build and maintain robust applications and services—front-end and back-end—that power our client-facing platforms. You’ll collaborate across teams to design scalable systems and deliver high-quality solutions.

We’re looking for someone who embodies our core values:

• Cloud-Ready Mindset: You’ve architected and deployed solutions using leading IaaS and PaaS platforms, especially Azure.
• Empathetic Listener: You build long-lasting solutions by understanding customer needs, industry trends, and team dynamics.
• Collaborative Spirit: You thrive in multi-cultural, cross-functional teams and communicate effectively across roles.
• Continuous Learner: You stay curious, adapt quickly, and seek out new ways to improve systems and processes.
• Ownership Mentality: You take initiative, embrace responsibility, and contribute to the fast-paced growth of our agile team.

What You’ll Do:

Develop full stack applications using PHP, C#, Angular or React, and .NET Translate business requirements and storyboards into functional software Build high-performance services for cloud (Azure) and on-prem environments Design, build, and maintain reusable, efficient code in PHP and C# Optimize application performance, quality, and responsiveness Troubleshoot bugs and bottlenecks, and implement effective solutions Maintain code quality through reviews, testing, and automation Contribute to release planning, deployment processes, and documentation Identify opportunities for architectural and codebase improvements

What You’ll Bring:

3–6 years of experience in full stack development Strong hands-on experience with both PHP and C# Proficiency in Angular or React JS Solid understanding of .NET Framework (4.0 or later) Experience writing LINQ queries and developing APIs Familiarity with SQL Server or other relational databases Clean, readable coding style and strong debugging skills Experience with Git and version control best practices Exposure to Microsoft Azure services (Function Apps, Logic Apps, DevOps, App Insights)

Nice to Have:

Experience with Java and Entity Framework Familiarity with NoSQL databases and schema design Knowledge of Azure Service Bus, RabbitMQ, and Redis Cache Background in building scalable SaaS platforms or automation tools What we’re offering 15 days of paid holidays 15 days of sick leave 1 day birthday leave HMO on Day 1 + 1 free dependent Night Differential pay, as applicable Night allowance or Weekend allowance, as applicable Internet allowance Coffee allowance Wellness allowance One-time remote work allowance Meet-up allowance to celebrate events Working with an awesome team :)

Legally, we need you to know this:

We are an equal-opportunity employer and value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. If you require accommodations due to a disability to participate in the application or interview process, please get in touch with our team at careers@sendle.com to discuss your needs.

But it’s important to us that you know this:

We strongly believe that diversity of experience contributes to a broader collective perspective that will consistently lead to a better company and better outcomes. We are working hard to increase the diversity of our team wherever we can and we actively encourage everyone to consider becoming a part of it. If you want to be a part of something remarkable, we’re excited to hear from you. #LI-Remote