Back-end Sr. Software Engineer   Position Overview: As a Senior Software Engineer at Oportun, you will be a key member of our engineering team, responsible for designing, developing, and maintaining sophisticated software solutions in achieving the charter of the engineering group. Your mastery of a technical domain enables you to take up business problems and solve them with a technical solution. With your depth of expertise and leadership abilities, you will actively contribute to architectural decisions, mentor junior engineers, and collaborate closely with cross-functional teams to deliver high-quality, scalable software solutions that advance our impact in the market. This is a role where you will have the opportunity to take up responsibility in leading the technology effort – from technical requirements gathering to final successful delivery of the product - for large initiatives (cross-functional and multi-month long projects).   Responsibilities: You actively contribute to the end-to-end delivery of complex software applications, ensuring adherence to best practices and high overall quality standards. You have a strong understanding of a business or system domain with sufficient knowledge & expertise around the appropriate metrics and trends. You collaborate closely with product managers, designers, and fellow engineers to understand business needs and translate them into effective software solutions. You provide technical leadership and expertise, guiding the team in making sound architectural decisions and solving challenging technical problems. Your solutions anticipate scale, reliability, monitoring, integration, and extensibility. You conduct code reviews and provide constructive feedback to ensure code quality, performance, and maintainability. You mentor and coach junior engineers, fostering a culture of continuous learning, growth, and technical excellence within the team. You play a significant role in the ongoing evolution and refinement of current tools and applications used by the team, and drive adoption of new practices within your team. You take ownership of (customer) issues, including initial troubleshooting, identification of root cause and issue escalation or resolution, while maintaining the overall reliability and performance of our systems. You set the benchmark for responsiveness and ownership and overall accountability of engineering systems. You independently drive and lead multiple features, contribute to (a) large project(s) and lead smaller projects.  You can orchestrate work that spans multiples engineers within your team and keep all relevant stakeholders informed. You support your lead/EM about your work and that of the team, that they need to share with the stakeholders, including escalation of issues   Qualifications: Extensive proficiency in one or more programming languages, such as Java, Kotlin, C#, Python or similar. 5+ years of experience in working with relational databases and SQL is a must. 2+ years of experience in working with document style database like MongoDB, DynamoDB etc 2+ years of experience working on application being deployed to Kubernetes environment. Kubernetes working knowledge is highly preferable. Prolonged experience with getting 80%+ code coverage with no reliability on manual testing but depend solely on automated testing. Demonstrated experience in web application development, RESTful APIs, and frontend technologies (e.g., HTML, CSS, JavaScript) is advantageous. Typically requires a minimum 6 years of related experience with a Bachelor's degree; or a Master's degree with an equivalent combination of education and experience. Proven track record of delivering sophisticated software solutions with high quality. Strong understanding of data structures, algorithms, and software design principles. Solid grasp of version control systems, such as Git. Experience with cloud technologies, preferably AWS or Azure, is highly desirable. Proven ability to mentor and lead other engineers, fostering a collaborative and supportive work environment. Exceptional problem-solving and analytical skills, with a passion for tackling complex technical and business problems. challenges. Excellent communication and interpersonal abilities, with a track record of effectively collaborating in a team-oriented environment.