Role Description This position is a nuclear engineer who supports the design, development, and safety analysis of nuclear reactors. Functions within this role include performing calculations and analyses to support nuclear and radiological safety, shielding design, reactivity and criticality control, and core design. Key Responsibilities - Execute design, analysis, or evaluation activities using sound engineering principles and adhering to business standards, practices, procedures, and product/program/project requirements. - Possess working level knowledge of, or technical experience in one or more of the following areas: - Influence and support the development of strategy, methodology and technical tools for the area of responsibility. - Interpret internal and external business challenges and recommend best practices to improve products, processes, tools, or services. - Use judgement to support decision making and the handling of complex tasks or problems in areas of operations, product management, technology, or engineering. - Work within a multidisciplinary engineering team. - Perform work in accordance with design control procedures, ensuring thorough documentation of work, facilitation of internal and external design reviews, and control of product design configuration data. Qualifications - 3-5 years of experience in the relevant engineering discipline, including successful delivery of Mechanical Handling designs. - Background in regulated environments such as nuclear, aerospace, defense, or industrial capital projects. - Bachelor’s degree in Nuclear Engineering or related technical discipline. - Ability to maintain communication and stakeholder engagement in a virtual and hybrid team environment. - Ability to travel - Candidate will be required to travel on approximately 10% of the year and depending on the project phase. - Must be a U.S. person eligible to meet DOE Export Control requirements under 10 CFR 810. Desired Skills & Experience - Experience with Nuclear Safety Analysis codes and methods (e.g., MELCOR, RADTRAD, SAPHIRE, SCALE, ORIGEN). - Experience with NQA-1 in a nuclear environment. - Proficiency with engineering software tools and AI-enabled platforms. - Experience in startup or innovation-driven organizations. Our Commitment Deep Fission is an equal opportunity employer committed to building a diverse and inclusive workplace. We welcome applicants from all backgrounds who share our passion for advancing clean nuclear energy and creating a sustainable future. We do not discriminate on the basis of race, color, creed, religion, ancestry, age, sex, marital status, national origin, disability, veteran status, or any other characteristic protected by applicable law.

• Build, run, and improve core backend systems alongside a collaborative, supportive team. • Take end-to-end ownership of systems, contributing to a strong engineering culture focused on quality, reliability, and long-term maintainability • Lead work across the full development lifecycle—design, estimation, implementation, testing, debugging, and deployment—while learning and applying best practices for building and operating reliable systems at scale. • Ship code that directly impacts Toast’s growth and the day-to-day operations of restaurant teams • Partner with product and design to influence what we build and how we build it • Contribute to and elevate team standards through thoughtful code reviews and technical discussions • Mentor and provide technical guidance to other team members

• Define and drive the engineering strategy and roadmap for your area, ensuring alignment with business objectives • Partner closely with product, architecture, and executive leadership to co-create strategy and translate it into actionable execution plans • Build, inspire, and scale high-performing teams; foster a culture of ownership, accountability, and continuous improvement  • Establish robust operational mechanisms for predictable, high-quality delivery across complex, distributed systems • Make investment trade-offs, prioritize resources, and ensure technical health and system reliability for the long term • Mentor engineering leaders, cultivate talent, and champion diversity and inclusion across the organization

Role Description ACV Auctions is looking for a Software Engineer to join our MAX Engineering team and work on our SaaS Product, MAX Digital. The position will focus on backend development & maintenance of C#, ASP.NET features & services hosted in AWS and utilizing SQL Server. The ideal candidate has a strong background and proven track record of architecting and designing enterprise applications in C#, ASP.NET and SQL Server, a penchant for high quality code, and a team-minded approach to development. What you will do: - Develop APIs, services, background workers, and MVC web applications using C#, ASP.NET (including modern .NET), and an SQL database (SQL Server preferred; other relational databases such as PostgreSQL or MySQL are also acceptable). - Design and build complex systems that can scale rapidly with little maintenance, with a strong focus on reliability, performance, and operational excellence. - Design, build, and maintain Kafka-based event processing services, including consuming, deserializing, validating, persisting, and reacting to events to drive downstream workflows. - Design and implement effective service/product interfaces, including third-party API integrations and extensible handler patterns for new integrations. - Develop and maintain application data models, including writing and tuning complex SQL queries, optimizing indexes and performance, and designing schemas that reliably support application workflows. - Own larger, complex initiatives end-to-end—from discovery and requirements through delivery and production support—driving alignment across engineering and business stakeholders. - Collaborate with software and production engineers to design scalable services, plan feature roll-out, and ensure high reliability and performance of our products. - Design and develop systems across all major departments including but not limited to; data, enterprise applications, and IT. - Lead technical design and architecture decisions across multiple systems/services, and help establish standards, patterns, and best practices. - Modify and develop custom software patterns as needed to solve highly complex software problems, and clearly document tradeoffs and long-term maintenance implications. - Be accountable for the overall performance of products and/or services within a defined area of focus, including diagnosing production issues and driving improvements. - Conduct code reviews, develop high-quality documentation, and build robust test suites for your products (unit/integration testing), ensuring maintainable and well-covered code. - Provide technical leadership through mentoring, coaching, and strong design/code review feedback, helping raise overall engineering quality. - Develop roadmaps and prioritize technical debt to effectively plan features and work, balancing delivery with long-term platform health. - Drive operational maturity (observability, incident response, on-call practices, reliability goals) and lead post-incident analysis with preventative action plans. - Handle multiple competing priorities in an agile, fast-paced environment while maintaining strong engineering discipline and delivery quality. - Perform additional duties as assigned. Qualifications - Ability to read, write, speak and understand English. - BS degree in Computer Science or a related technical discipline or equivalent practical experience preferred. - Minimum 8 years of experience building SaaS web applications using ASP.NET, C# and JavaScript and/or Python (12+ years desirable). - Strong experience maintaining and extending an existing codebase, adapting to pre-existing patterns and tracing the code’s path of execution across services. - Strong experience integrating 3rd-party APIs, implementing authentication & authorization and developing asynchronous data flows. - Strong experience publishing and consuming Kafka events, including designing event contracts, building reliable event-driven workflows, and handling ordering, retries, idempotency, and failure recovery. - Strong experience developing unit and integration-tests, and setting expectations for test strategy and coverage. - Strong experience integrating with cloud service (AWS), specifically: SQS, SNS, S3, ECS, EKS, Lambda, ElasticSearch, Docker / Containers. - Strong experience working with Docker and Kubernetes, including containerization, orchestration (k8s) and serverless deployment scenarios. - Strong experience with build & deployment automation (CI/CD) and release workflows. - Strong SQL programming and data-layer development experience (schema design, query performance, indexing, and data reliability patterns). - Minimum 8 years of experience working with continuous integration and build tools. - Expert in version control systems and branching/release strategies. - Expert in software engineering tooling and mentors and drives adoption for new tools and tooling standards. - Expert in release, builds, testing and the entirety of the SDLC. - Expert at debugging distributed systems using distributed tracing and other common tools; able to lead root-cause analysis and preventative improvements. - Top notch communication skills, including clearly communicating tradeoffs and aligning stakeholders. - Experience architecting and designing systems from the ground up, including making pragmatic decisions for scalability, reliability, and maintainability. - Experience working with a geographically dispersed team across multiple timezones, including leading technical alignment and delivery across teams. Benefits - Multiple medical plans including a high deductible, low cost health plan. - Company-sponsored (paid) Short-Term Disability, Long-Term Disability, and Life Insurance. - Comprehensive optional benefits such as Dental, Vision, Supplemental Life/AD&D, Legal/ID Protection, and Accident and Critical Illness Insurance. - Generous paid time off options, including uncapped vacation days, the greater of 3 paid sick days or in accordance with the applicable state or local paid sick leave law, 6 paid company holidays, 2 floating holidays, parental leave, bereavement leave, jury duty leave, voting leave, and other forms of paid leave as required by applicable law or regulation. - Employee Stock Purchase Program with additional opportunities to earn stock in the Company. - Retirement planning through the Company’s 401(k). Company Description ACV is a technology company that has revolutionized how dealers buy and sell cars online. We are transforming the automotive industry. ACV Auctions Inc. (ACV), has applied innovation and user-designed, data driven applications and solutions. We are building the most trusted and efficient digital marketplace with data solutions for sourcing, selling and managing used vehicles with transparency and comprehensive insights that were once unimaginable. We are disruptors of the industry and we want you to join us on our journey. Our network of brands include ACV Auctions, ACV Transportation, ClearCar, MAX Digital and ACV Capital within its Marketplace Products, as well as, True360 and Data Services.