Senior Software Engineer

🧡📦💙Founded in 2012, Halcyon Labs is a YC unicorn whose mission is to make shipping simple for businesses—from garage startups to the Fortune 500. Shipping, now more than ever, is the backbone of the global economy, but integrating the technology-enabled operations of a modern business with the low-tech and complex shipping industry has always been a challenge. Halcyon Labs solves this problem with the first developer-friendly REST API for shipping, and we continue to push boundaries and discover new ways to simplify shipping for all. Our team is rapidly growing, and this is the perfect time to get on board. Join us and help build the shipping infrastructure of the future. We’re builders, problem-solvers, and “there has to be a better way” people. We like elegant architecture, fast decisions, and shipping (pun intended) improvements that power millions of deliveries every day. We stay scrappy, we move fast, and we don’t wait for permission to innovate in an industry that desperately needs it. If you want to work on systems that actually move the world—literally—you’re in the right place. 🚚✨ Halcyon Labs does not consider candidates who misrepresent their identity, experience, employment history, or technical qualifications. Applications containing false information, stolen professional profiles, or unverifiable credentials will be removed from consideration. We conduct early-stage verification of resumes, LinkedIn profiles, GitHub accounts, and other relevant professional information as part of our hiring process. Position Summary: The Senior Software Engineer will play a critical role in designing, developing, and maintaining high-quality software solutions for the organization. This role will work closely with cross-functional teams, including product managers, designers, and other engineers, to deliver innovative and scalable software products that meet the needs of our customers and stakeholders. Expertise and leadership will be vital in guiding the team and ensuring best practices in software development. Essential Duties and Responsibilities: The essential functions include, but are not limited to the following: o Design, code, test, and debug software applications in accordance with established coding standards and best practices. Develop both front-end and back-end components, ensuring optimal performance, scalability, and security. o Collaborate with product managers, designers, and other stakeholders to translate business requirements into technical specifications and architectural designs. Provide input on feasibility and technical approaches for implementing new features and improvements. o Participate in code reviews to maintain code quality, ensure consistency, and share knowledge among team members. Offer constructive feedback and suggestions to enhance codebase integrity. o Identify and troubleshoot software defects and issues, employing analytical thinking and problem-solving skills to develop efficient and effective solutions. o Create and maintain clear and comprehensive technical documentation, including system architecture, design documents, and user guides. Communicate technical concepts to both technical and non-technical team members. o Work closely with cross-functional teams to ensure seamless integration of software components and successful product releases. o Stay up-to-date with industry trends, emerging technologies, and best practices in software development. Propose and implement process improvements to enhance development efficiency and product quality. o Develop and execute unit tests, integration tests, and performance tests to validate software functionality and reliability. Implement automated testing frameworks to streamline the testing process. o Utilize version control systems to manage and track changes to source code. Collaborate effectively within a distributed version control environment. Minimum Education & Experience Qualifications: o 6+ years of professional software engineering experience building, operating, and evolving production-scale applications, APIs, and distributed systems. o 2+ years of hands-on experience developing software in Golang. o 2+ years of experience designing, deploying, and operating services in Kubernetes-based environments. o 3+ years of experience designing and building scalable, high-performing APIs with attention to reliability, operability, maintainability, and long-term technical direction. o Proven track record of providing technical leadership including driving technical design reviews, influencing engineering standards, and making architecture decisions for teams of 3+ software engineers o Experience leveraging AI-assisted development tools to improve engineering productivity, code quality, and developer workflows. o Experience with relational and NoSQL databases, data modeling, and performance optimization. o Experience influencing technical strategy, gaining alignment across teams, and unblocking execution through strong communicatio