Senior Product Engineer (Full-Stack)

Prolific

SENIOR PRODUCT 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 Senior Software Engineers with a ‘product builder’ mind-set to join our team and take a pivotal role in the development and guidance of our product. As a ‘t-shaped’ engineer, you will bring a broad practical knowledge across various areas of software development, complementing and supporting our growing team whilst likely having a deeper specialism in front or backend. This is an exciting opportunity to leverage your existing skills, experience, and knowledge to significantly influence the trajectory of our product as we aim to revolutionize research.   What you’ll bring to the role * Deep understanding of modern web applications * Experience building Typescript/Javascript applications and using NoSQL databases * Experience using Python * Knowledge of Event-Driven Architecture * Experience using AWS (Serverless) and/or GCP * Understand the importance of driving quality into code through test automation * Have supported applications in production, with demonstrable experience of good observability practices within a full stack environment. (e.g. Rum, Tracing) * Have worked in a collaborative environment with strong engineering practices and know what good engineering looks like * Care about the product life cycle and are customer value focused * Understand the value of continuous, iterative improvement using data to drive decisions and a culture of feedback * Passionate about software development with an appetite for learning and self-improvement   What you’ll be doing in the role  * As a member of a cross-functional, stream-aligned team, you will work collaboratively with the teams’ engineering manager, product manager, designer, and up to 4-5 other engineers, including a tech lead * Using agile software development practices and a product mindset, you will work as a team to plan, build and support software that our customers love * You will be highly self-motivated and energetic and enjoy working in a fast-paced environment with a bias for action * Collaborating with teams outside of product engineering, working closely with customers and understanding their needs * Be happy working in all the major cloud providers: AWS, GCP & Azure * With a You Build It, You Run It mindset, you will have intimate knowledge of our products from code commit through to production operation * Supporting production systems with monitoring tools such as Datadog * Strive for stable systems observability * You will champion our principles, fuel a growth mindset by getting involved in communities and help improve our engineering culture * Pushing the boundaries, questioning the status quo, ensuring what we are doing and what we are building has high value and impact for our users   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. Working for us will place you at the forefront of AI innovation, providing access to our unique human data platform and opportunities for groundbreaking research. Join us to enjoy a competitive salary, benefits, and remote working within our impactful, mission-driven culture.   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.

Railsware

We’re building a Trading Terminal— a platform for reviewing and replaying trades, designed for prop firms and traders. It combines order flow visualization with replay, audit, and execution in one system. We work in a spec-driven way: we plan before we build. If you’re a senior engineer who actively trades and cares about building better trading tools, this role is for you.  THE TEAM We’re a small founding team: 2 co-founders and 1 engineer (you would be the second), plus part-time support in Product, DevOps, and Compliance + access to a senior Railsware Director with experience shipping many products. Yaroslav Lazor — engineering & product (previously worked on Calendly) Umar Ashraf — markets & distribution (runs a 4M+ YouTube trading channel, founder of Tradezella) WHAT YOU’LL GET * Ownership — you’ll be involved in the full process: from specs to shipping. No ticket queue. * Product connection — you’ll use the product yourself as a trader. * AI-first team — we use AI as part of how we plan, research, and build, not just as a helper tool. * Working style — flexible. We collaborate when needed and work independently when it’s more effective. We focus on results. * Working style — outcome-driven. We combine synchronous collaboration with focused asynchronous work, choosing the approach that best supports effective outcomes.   WHO WE’RE LOOKING FOR A senior full-stack engineer who is also an active trader. This role requires both strong engineering skills and real trading experience. If you only code or only trade, this is probably not the right fit. We’re looking for someone who is comfortable working across product, technology, and trading. REQUIREMENTS * 5+ years of engineering experience * Comfortable across backend systems, including low-latency backend * Experience with modern frontend frameworks ( React 18+ / TypeScript) * Active trader: futures or crypto, day trading or scalping * Spec-driven, AI-orchestrated development: you plan deeply and know how to work with AI agents effectively * Experience with real-time market data: WebSocket streaming, order books, Level 2 depth * Ability to produce your own product specs * Ability to make UX decisions based on the UX guide and input from a UX advisor * Fluent English (written and spoken) Would be a plus:  * Rust (we use Rust/Axum), Experience with high-performance browser rendering (e.g. WebAssembly, ImGui, egui) * Familiarity with trading tools like footprint charts, DOM/ladder, heatmaps, market/volume profile, CVD WHAT YOU’LL WORK ON (FIRST 90 DAYS) * Building real-time market data pipelines (Level 2 data, order book reconstruction) * Developing order flow visualizations (footprints, heatmaps, DOM, profiles, CVD) * Improving the trading interface (charts, DOM, tape, order panel working together) * Preparing live data features for partnerships with prop firms * Integrating with market data providers

Graswald

YOUR MISSION Remote (CET) About Us At Graswald AI, we’re building the AI operating system for fashion brands and retailers, starting with AI image and content generation. Our engineering team tackles rapid scaling challenges, GPU-intensive workloads, and enterprise-grade infrastructure to deliver fast, pixel-perfect results for global brands. In the past year alone, we’ve signed 50 enterprise fashion clients who rely on us to reduce costs and accelerate creative timelines. Backed by leading VCs and strategic investors including Lakestar and Orendt Studios, and preparing for a Series A later this year, we’re growing fast and building technology that is already reshaping how fashion content is produced The Role: The Senior Full Stack Software Engineer is a core member of a product team, responsible for designing, building, testing, and deploying high-quality software. Engineers work closely with their Team Lead (TL) and Product Manager (PM) to turn product requirements into reliable, scalable features that deliver real value to users. Engineers at Graswald operate in a highly dynamic environment, where requirements and architectures evolve quickly. This role requires comfort with ambiguity, strong ownership, and the ability to make pragmatic technical decisions with incomplete information. YOUR PROFILE Key Responsibilities * Software Design & Quality: Design and optimize scalable backend systems and high-performance frontend applications, ensuring security, performance, and maintainability. Write clean, well-documented code and participate in code reviews to ensure quality, and reliability. * Problem-Solving & Troubleshooting: Identify, analyze, and resolve technical issues in development and production environments, and proactively improve existing systems where needed. * Collaboration and Teamwork: Work closely with your TL, PM, and peers to align on priorities, surface blockers early, and collaborate on design and problem-solving. Contribute to technical design discussions and propose solutions. * Requirement Understanding & Implementation: Work closely with the PM and TL to understand product requirements, user stories, and technical specifications. Translate these into practical and effective technical implementations. * Continuous Learning & AI-Driven Development: Maintain a strong dedication to continuous learning and professional development, staying current with industry trends, emerging technologies, and best practices. Actively explore, learn, and apply new AI capabilities and tools to enhance personal productivity, improve software development processes, and contribute to innovative solutions. Embrace and experiment with AI-powered development practices within the team.Research and evaluate new technologies or approaches to solve technical challenges. * Documentation: Create and maintain clear, concise technical documentation for code, system designs, and processes to facilitate understanding and onboarding for current and future team members. Qualifications: skills, abilities, and experience * Experience * Minimum 5 years of experience writing excellent, standards-compliant code. Demonstrated ability to independently design, build, and maintain production-grade software systems. * Experience working on the engineering team in a start-up, scale-up or product-driven company * Experience designing and evolving backend systems that operate reliably under increasing load. * Strong experience writing high-quality, maintainable, standards-compliant code in production systems. * Strong understanding and experience with building and consuming API-driven solutions. * Demonstrable experience with Agile or Scrum software development methodologies. * Specific Technology Focus * Mastery of Python and Django and strong skills in TypeScript and React. * Experience with database technologies, cloud platforms (e.g., AWS, Azure, GCP), and API design principles. * Strong analytical and problem-solving abilities, with a methodical approach to debugging and issue resolution. Soft Skills: * Strong communication skills, high integrity, and great attention to detail. * An entrepreneurial spirit with the ability to adapt and grow quickly as the organization scales. Nice to have: * Experience with generative AI tooling (Stable Diffusion, ComfyUI) or creative platforms (p5.js, Three.js). Education: * A minimum of a Bachelor's degree in Computer Science, Information Technology, or a similar technical field. WHY US? Why Join Us: Impact: Help redefine AI-driven content creation for the world’s biggest brands. Innovation: Work with cutting-edge AI models and push the boundaries of generative visuals. Fast-Paced Execution: We move quickly, iterate rapidly, and work closely with customers to build what they need. Growth: Join a high-caliber, fast-scaling startup with huge opportunities for career advancement. Culture: Be part of a passionate, collaborative team that values creativity, problem-solving, and technical excellence.