Senior Software Engineer

Prolific

SENIOR SOFTWARE ENGINEER  Engineering  Prolific Prolific is not just another player in the AI space – we are the architects of the human data infrastructure that's reshaping the landscape of AI development. In a world where foundational AI technologies are increasingly commoditized, it's the quality and diversity of human-generated data that truly differentiates products and models.   The role We’re looking for impact-focused Software Generalists to join our specialized team focused on serving frontier model creators and enterprise AI application developers. As a full-stack engineer, you will work across Prolific’s domains to solve customer and product problems. This is an exciting opportunity to work directly with frontier AI companies, making critical technical decisions that balance scrappy startup execution with scalable, reliable engineering, as Prolific revolutionizes research for the AI community. You'll will have regular in person collaboration with customers and our US team, as well as collaborate closely with our UK-based tech teams. This role is hybrid based out of our San Francisco office, approx 1-2 days a week.   What you’ll bring to the role * Over 4 years of experience in a product engineering role * Can translate business concepts into software models * Ability to quickly learn and adapt across the breadth of Prolific’s domains * Familiar working in both monoliths and distributed systems * Strong communication and collaboration skills for direct customer interaction * Good understanding of modern web applications and architecture design patterns * Experience supporting applications in production environments * Judgment to balance scrappy startup execution with scalable, reliable engineering * Comfort with rapid iteration and responding to customer queries with urgency * Experience with some of our technology stack: * Python (we use Django & Fast API) * TypeScript and JavaScript (we use Vue.js) * SQL and NoSQL databases (we use MongoDB and PostgresSQL) * Building and deploying to the cloud (we use GCP, Kubernetees, Github Actions & CircleCI) * Instrumenting, monitoring & observability (we use Datadog)     What you’ll be doing in the role  This is a unique engineering role at Prolific. In this role, you will operate with high ownership and a product mindset, at start-up pace, to solve customer problems and capture business opportunities irrespective of the technology required to do so. You will be part of a cross-functional Product Engineering team, optimised for the success of a single customer group. You will collaborate directly with account managers, customer success specialists and customers to deeply understand their problem spaces. You will ideate and build with autonomy, supported by a high-performing team. This role will see you work across Prolific domains to solve customer problems, needing you to get up to speed quickly and deliver across shared codebases to a high engineering standard. You will also help support our systems in production & respond to incidents when required.     Key Technologies  * Cloud Platforms: Google Cloud Platform and AWS * Programming Languages: Python, JavaScript, and TypeScript * Frameworks: Vue.js, Django Rest Framework, Container-based and Serverless architectures * Databases: MongoDB and DynamoDB * DevOps and Monitoring: CircleCI, GitHub Actions, Kubernetes, Celery, EventBridge and DataDog   Why Prolific is a great place to work We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioral data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviors into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breath and the best of humanity. Join us to enjoy a competitive salary, benefits, and remote working within our impactful, mission-driven culture. At Prolific, our compensation packages for eligible roles include base salary, equity, and benefits. Many roles also include the opportunity to earn a cash variable element, such as a bonus or commission. Each job posting shows a salary range that reflects the minimum and maximum target for new hires, based on the role’s location as well as your skills, experience, and relevant education or training. You can check the job posting’s subtitle to see where the position is based. Your recruiter will also be happy to share the specific salary range for your preferred location during the hiring process. For pay transparency, the base salary range for this full-time role in San Francisco is $250,000 - $300,000 per annum.   Links to more information on Prolific Benefits  External Handbook  Website  Youtube    Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific use of your personal information.

Variance

Role At Variance, we are teaching machines to make the hardest judgement calls at scale. That means building AI agents for the high-precision gray-area of risk investigations, fraud, and identity reviews. We’re a small, talent-dense team in San Francisco tackling problems that touch billions of events and entities. Our customers include Fortune 500 companies and global marketplaces, and we’re scaling systems that free millions of hours of human effort. We’re looking for a Senior Software Engineer who wants to own product and technical decisions end-to-end. You’ll work directly with the founders to build and scale AI-powered systems where precision, speed, and trust matter deeply. You’re a fit if you: * Have 4+ years of professional software engineering experience or equivalent * Care deeply about craftsmanship and have strong opinions about product quality, system design, and code quality * Thrive in high-ownership environments and want to drive projects end-to-end, from backend architecture to polished UI to production * Have strong fundamentals and can ramp quickly in our stack: React/Next.js, TypeScript, MySQL, and ClickHouse * Are comfortable making pragmatic technical tradeoffs in ambiguous, fast-moving environments * Have experience building reliable systems at scale and debugging issues in production * Enjoy collaborating closely with product, design, and leadership to turn fuzzy problems into shipped systems * Raise the bar for the team through technical leadership, mentorship, and high standards What you’ll do * Own product features and systems end-to-end, from architecture and implementation to launch and iteration * Lead technical decisions across the stack, balancing speed, quality, maintainability, and scale * Build AI-powered interfaces and decision systems that operate in real time with high precision and user trust * Work directly with the founders on frontier problems in fraud, abuse, and risk * Scale our product into new industries and workflows through rapid pilots, live demos, and fast feedback loops * Improve engineering velocity by shaping internal tools, patterns, and standards * Help define the technical foundation of the company as we grow Our culture We believe in ownership, urgency, and craft. We enjoy spirited debate, wild ideas, and building things we're proud of. We're fully in-person in San Francisco. What we offer * Competitive salary and meaningful equity * Health care: we offer platinum-level medical, dental, and vision insurance * Unlimited PTO, sick leave, and parental leave * Up to $100 in reimbursement for personal health & wellness expenses each month * 401(k) plan

Stripe

WHO WE ARE ABOUT STRIPE  Stripe, LLC. is a financial infrastructure platform for businesses. Millions of companies - from the world’s largest enterprises to the most ambitious startups - use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. WHAT YOU’LL DO RESPONSIBILITIES * Design and build tools that enable partner teams to interact more easily with the system. * Work with engineers across the company to launch new products or features.  * Design, build, and maintain APIs, services, and systems across Stripe’s engineering teams.  * Debug production issues across services and multiple levels of the stack.  * Improve engineering standards, tooling, and processes.  * Design and build tools and software that reduce friction in meeting onboarding requirements. WHO YOU ARE MINIMUM REQUIREMENTS * Bachelor's degree or foreign equivalent in Computer Science or a related field, plus 5 years of Software Engineering experience.  POSITION ALSO REQUIRES THE FOLLOWING: * 5 years of experience in building software solutions at scale in Python, Ruby, Java, or similar; * 5 years of experience in making trade-offs between user experience and technical constraints; * 5 years of experience in translating business requirements into software designs; * 5 years of experience in debugging production issues across services and multiple levels of the stack; and * 5 years of experience in building and maintaining production systems.   Salary: $224,000 - $336,000/yr. This salary range represents the base salary range for the role and any sales commissions/sales bonuses targets, if applicable, would be in addition to the base salary. 40 hrs/week Full remote work permitted. Multiple Positions Available.  Additional benefits for this role may include: equity, company bonus or sales commissions/bonuses; 401(k) plan; medical, dental, and vision benefits; and wellness stipends. CA28 #LI-DNI