Role Description As a fullstack engineer at CoinList, you’ll find that your days are filled with fascinating challenges: - Developing a seamless onboarding experience. - Building integrations with third-party KYC/AML and fraud prevention vendors. - Ensuring proper observability and alerting on important systems. You’ll contribute in all areas: - Deep involvement in web development or building open-source dev tools to automate operations. - Working across the stack, frequently picking up new languages and platforms as needed. You’ll ship product: - Participating in hack days and experimental prototypes. - Developing new types of auction models. - Writing clean, well-documented code and performing unit tests. - Following best practices in a fast-paced environment. You’ll rapidly grow and improve: - Working with some of the smartest engineers who love to learn and teach. - Engaging in feedback and deep conversations on a daily basis. You’ll help shape the product: - Having significant input into product development. - Beta testing new prototypes and communicating directly with users. - Ensuring your ideas are heard. You’ll be an owner: - Taking on responsibility and pushing yourself to new levels. - Running critical token sales or leading work on new platforms. Qualifications - 3+ years of experience in fullstack development. - Comfortable in both React and Ruby on Rails. Requirements - Ability to ship high-quality code and meet deadlines. - Focus on important tasks and push back on less critical ones. - Valuing good design and discussing product functionality. - Excitement for large disruptions over small improvements. - Enjoyment in tackling hard problems.

Title: Sr Software Engineer - Remote Location: Remote USA Note: Minneapolis or the Washington, D.C. area - Hybrid Job Description: Optum Tech is a global leader in health care innovation. Our teams develop cutting-edge solutions that help people live healthier lives and help make the health system work better for everyone. From advanced data analytics and AI to cybersecurity, we use innovative approaches to solve some of health care's most complex challenges. Your contributions here have the potential to change lives. Ready to build the next breakthrough? Join us to start Caring. Connecting. Growing together. Position in this function design, build, and operate partner-facing REST/JSON and event-driven APIs, owning delivery from requirements through release. Drive high-priority UHC initiatives by collaborating with product, architecture, and downstream consumer teams to deliver on time and with high quality. Establish and enforce API standards and governance (contracts, versioning, documentation) while ensuring services meet reliability, scalability, performance, and security/compliance requirements. Improve engineering excellence through automated testing, CI/CD and deployment safety, observability, production support/on-call participation, and technical leadership/mentoring. You'll enjoy the flexibility to work remotely * from anywhere within the U.S. as you take on some tough challenges. For all hires in the Minneapolis or Washington, D.C. area, you will be required to work in the office a minimum of four days per week. Primary Responsibilities: - Design, develop, and deliver partner-facing REST/JSON and event-driven APIs from requirements through production release - Translate business requirements into technical designs; lead design reviews and align with architecture standards - Drive execution of high-priority UHC initiatives by coordinating with product, architecture, and downstream consumer teams - Define and enforce API contract standards (versioning, backward compatibility, error handling, documentation) across the Partner API portfolio - Engineer secure, reliable, and performant services (authN/authZ, encryption, secrets management, input validation, resiliency, capacity planning) - Build and maintain automated test coverage (unit, integration, contract, regression) and strengthen quality gates to reduce defects - Enhance CI/CD pipelines and deployment safety practices (feature flags, canary/blue-green, rollback) to enable faster, safer releases - Implement observability (logging, metrics, tracing), create dashboards/alerts, and maintain runbooks for production readiness - Participate in on-call support and incident response on a rotation approximately every 4-6 weeks, including triage, mitigation, and post-incident actions - Support partner onboarding and troubleshooting by diagnosing integration issues and collaborating with internal/external stakeholders to resolve them - Provide technical leadership through code/design reviews, mentoring, and continuous improvement of engineering practices and standards You'll be rewarded and recognized for your performance in an environment that will challenge you and give you clear direction on what it takes to succeed in your role as well as provide development for other roles you may be interested in. Required Qualifications: - 5+ years of professional software engineering experience building and operating production services - Solid hands-on expertise with C#/.NET (ASP.NET Core) building backend services and APIs in a microservices/service-oriented environment - Proven experience designing, building, and supporting REST/JSON APIs (OpenAPI/Swagger), including contract-first design, versioning/backward compatibility, idempotency, and consistent error handling - Solid engineering fundamentals (data structures, distributed systems concepts, concurrency, resiliency, performance tuning) - Demonstrated production ownership: incident response, root cause analysis, postmortems, and continuous improvement - Demonstrated solid communication and collaboration skills across product, architecture, and global engineering teams Preferred Qualifications: - Experience with API management/gateway tools (e.g., Azure API Management, Apigee, Kong, Mulesoft) - Event-driven systems experience (Kafka, Azure Service Bus, SNS/SQS, RabbitMQ) - Experience leading technical design efforts, mentoring engineers, and driving engineering standards - Background in payments, healthcare integrations, or other regulated, high-availability environments - Observability experience: structured logging, metrics, tracing, dashboards/alerting; production readiness and operational runbooks - Security-minded development experience (OAuth2/OIDC, JWT, mTLS, secrets management, secure coding practices) - Experience with automated testing (unit/integration/contract), code quality practices, and CI/CD pipelines - Experience supporting external partner integrations and production SLAs; solid troubleshooting skills across client/server integrations - All employees working remotely will be required to adhere to UnitedHealth Group's Telecommuter Policy Pay is based on several factors including but not limited to local labor markets, education, work experience, certifications, etc. In addition to your salary, we offer benefits such as, a comprehensive benefits package, incentive and recognition programs, equity stock purchase and 401k contribution (all benefits are subject to eligibility requirements). No matter where or when you begin a career with us, you'll find a far-reaching choice of benefits and incentives. The salary for this role will range from $91,700 to $163,700 annually based on full-time employment. We comply with all minimum wage laws as applicable. Application Deadline: This will be posted for a minimum of 2 business days or until a sufficient candidate pool has been collected. Job posting may come down early due to volume of applicants. At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission. UnitedHealth Group is an Equal Employment Opportunity employer under applicable law and qualified applicants will receive consideration for employment without regard to race, national origin, religion, age, color, sex, sexual orientation, gender identity, disability, or protected veteran status, or any other characteristic protected by local, state, or federal laws, rules, or regulations. UnitedHealth Group is a drug-free workplace. Candidates are required to pass a drug test before beginning employment.

• Serve as a core .NET developer, collaborating closely with team members. • Participate in requirements discussions, team meetings, technical sessions, and code reviews. • Translate functional and technical requirements into well‑designed, scalable solutions. • Develop, integrate, and maintain code in accordance with established coding standards and architectural guidelines. • Ensure applications function end‑to‑end and meet quality expectations. • Perform unit testing and ensure software is thoroughly tested and defect‑free. • Conduct research, proof‑of‑concepts (POCs), and deliver demos or presentations as needed. • Demonstrate a commitment to diversity, equity, and inclusion through continuous development, modeling inclusive behaviors, and proactively managing bias.

• Manage and execute end-to-end for key technology platforms and be accountable for projects • Provide mentoring and guidance to more junior members of Software Engineering teams • Develop enterprise class & scalable web applications • Enhance and support existing web application functionality which includes new feature development and resolving complex code issues as reported • Collaborate with subject matter experts, product managers and engineers to build modern, scalable, user friendly and functionally robust web applications in an AGILE environment • Participate in all aspects of SDLC including analysis, requirements, design, implementation, testing and support • Use principles, guidelines and best practices as defined • Reviewing and analysing feature requirements • Maintaining and creating product knowledge documentation • Researching and embrace new techniques and technology to improve technology • Other duties may be assigned • Focus on quality throughout with strong unit testing