Senior Software Engineer (Python Expert)

🧡📦💙Founded in 2012, EasyPost 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. EasyPost 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. 🚚✨EasyPost 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 plays a key role in designing, developing, and operating scalable software solutions that support EasyPost's carrier integrations. This role is expected to independently lead complex technical initiatives, drive engineering best practices, and mentor other engineers while delivering high-quality software.The ideal candidate is an experienced Python engineer who can quickly become productive in a complex distributed environment, navigate ambiguity, and provide technical leadership through influence rather than authority. This individual will partner closely with product managers, engineering leadership, and fellow engineers to deliver reliable, scalable solutions that support business growth and operational excellence.This role requires strong software engineering fundamentals, excellent communication skills, and a demonstrated ability to mentor junior engineers while contributing meaningfully to architecture, design, implementation, and operational support.Essential Duties and Responsibilities:The essential functions include, but are not limited to the following:Technical LeadershipLead the design and implementation of complex software systems and integrations with minimal oversightDrive technical decision-making and contribute to architecture discussions across multiple services and systemsBreak down ambiguous problems into clear technical solutions and execution plansIdentify technical risks early and proactively propose mitigation strategiesSoftware DevelopmentDesign, code, test, and debug software applications in accordance with established coding standards and best practicesDevelop scalable, maintainable, and secure software solutions with a focus on performance and reliabilityCollaborate with product managers, designers, and stakeholders to translate business requirements into technical specifications and architectural designsLead technical design efforts and produce high-quality technical documentationDevelop and execute unit tests, integration tests, and performance tests to validate software functionality and reliabilityUtilize version control systems to manage and track changes to source codeMentorship & Team DevelopmentMentor and coach junior and mid-level engineers through code reviews, design discussions, pairing sessions, and day-to-day collaborationRaise engineering quality by promoting best practices in software design, testing, observability, and operational excellenceProvide constructive technical feedback and help establish consistent engineering standards across the teamParticipate in code reviews to maintain code quality, ensure consistency, and share knowledge among team membersOperational OwnershipParticipate in on-call rotations and assist in diagnosing and resolving production issuesDrive improvements in monitoring, alerting, observability, and system reliabilityInvestigate complex production issues and lead root cause analysis effortsIdentify and troubleshoot software defects and issues, employing analytical thinking and problem-solving skills to develop efficient and effective solutionsCollaboration & Continuous ImprovementWork closely with cross-functional teams to ensure seamless integration of software components and successful product releasesContribute to project planning, estimation, and technical roadmap discussionsStay current with industry trends, emerging technologies, and software development best practicesPropose and implement process improvements that enhance development efficiency, reliability, and product qualityMinimum Education & Experience Qualifications:Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience6+ years of professional software engineering experienceDemonstrated experience leading complex technical initiatives from design through production deploymentDemonstrated experience mentoring and developing other engineersExpert-level Python development experience in production environmentsStrong experience designing and building REST APIs and distributed systemsStrong experience debugging and troubleshooting complex production issuesStrong experience with relational databases and SQLExperience designing scalable, maintainable, and observable backend servicesExperience writing automated unit, integration, and end-to-end testsFamiliarity with software development methodologies (Agile, Scrum, etc.) and tools (JIRA, Confluence, etc.)Strong understanding of data structures, algorithms, object-oriented design principles, and software architecture patternsExcellent problem-solving skills and a detail-oriented mindsetStrong written and verbal communication skillsPreferred QualificationsExperience with carrier, logistics, shipping, payments, fintech, or other API-intensive domainsExperience with cloud platforms, preferably AWSExperience with monitoring, observability, and alerting toolsExperience working within service-oriented or microservice architecturesExperience working with high-volume, highly available production systemsCore Competencies Required:Knowledge and Application: Exhibits advanced wide-ranging experience, using in-depth professional knowledge, acumen, concepts and company objectives to develop, resolve complex models and procedures. Provides solutions to issues in creative and effective ways. Understands the interrelationships of different disciplines. Directs the application of existing principles and guides development of new policies and ideasComplexity & Problem Solving: Understands and works on complex issues where analysis of situations or data requires an in-depth evaluation of variable factors. Determines methods and procedures on new assignments. Exercises judgment in selecting methods, evaluating, adapting of complex techniques and evaluation criteria for obtaining results. Work is reviewed upon completion and is consistent with departmental objectivesCollaboration & Interaction: Networks with key contacts outside their own area of expertise. Adapts style and uses persuasion in delivering messages that relate to the wider firm business. Frequently advises others on complex matters. May be accountable through the team for delivery of tactical business targetsPhysical Demands and Work Environment: The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this position. Reasonable accommodation may be made to enable individuals with disabilities to perform the functions.Physical Requirements:Minimal to light physical effort is required in performing dutiesProlonged stationary periods at a desk and working on a computerExtensive use of computers, keyboards, and communication-based technology to exchange informationWhat We Offer:Comprehensive medical, dental, vision, and life insuranceCompetitive compensation package and equityMonthly work from home stipend of $50Flexible work schedule and paid time offCollaborative culture with a supportive teamA great place to work with unlimited growth opportunitiesThe opportunity to make massive contributions at a hyper-growth companyMake an impact on a product helping ship millions of packages per dayData Privacy Notice for Job Applicants:For information on personal data processing, please see our Privacy Policy: https://www.easypost.com/privacy"EasyPost is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, national or ethnic origin, sex, sexual orientation, gender identity or expression, age, disability, protected veteran status or other characteristics protected by law."To be considered for this position, you must be authorized and based in the United States.If you have any questions or concerns you can reach out to me directly on LinkedIn @KristinaPerna :).Any communication to applicants relating to the EasyPost hiring process will only come from email addresses with the domains kperna@easypost.com and pcardona@easypost.com. If in the course of the application or hiring process with EasyPost you are contacted through another domain, are requested to provide banking or other sensitive information, or you note any other suspicious activity, please contact recruiting@easypost.comWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.