Senior Full Stack Engineer Location: Framingham, Boston MA US Description Sincere is looking for a Senior Full Stack Engineer to help us make our products meaningfully better. This is a high-ownership individual contributor role for a seasoned engineer who can take a broad product area, understand the customer and business needs, and ship high-quality improvements. You will: - Build full-stack features across Ruby on Rails and Next.js - Own product initiatives end-to-end, from identifying opportunities and shaping solutions through implementation, launch, and iteration. - Partner with product/project managers and designers to identify customer pain points, uncover product opportunities, and deliver meaningful improvements. - Use tools like Claude Code and Codex as a core part of your workflow to explore, develop, test, and ship - Make practical technical decisions that balance speed, quality, maintainability, performance, and customer impact - Build polished, reliable, easy-to-use experiences with strong attention to UX - Use tools like Datadog and Mixpanel to monitor production behavior, investigate issues, and inform product decisions - Champion new ideas and continuously look for ways to improve our products, engineering practices, and customer experience. You are: - A seasoned full-stack engineer with 7+ years of professional software development experience - Comfortable working across our stack, including Ruby on Rails, TypeScript, React, Next.js, MySQL/Postgres, Redis, MongoDB, Sidekiq, OpenSearch, AWS, and Docker - Fluent with AI-assisted development tools such as Claude Code or Codex - Proven at building and maintaining large-scale customer-facing web applications - Product-minded, with strong instincts for customer needs, UX quality, business value, and technical tradeoffs - A self-starter who brings structure to loosely defined problems and drives them through execution - A strong partner to DevOps, with enough understanding of system architecture, cloud infrastructure (AWS), deployment, containerization, and infrastructure-as-code (Terraform) to collaborate effectively - Skilled at working in mature codebases, understanding existing architecture, and improving systems pragmatically - Detail-oriented, with high standards for both the code and the customer experience - Entrepreneurial, curious, and biased toward building, experimenting, and shipping - Collaborative and low-ego, with strong communication skills and pride in your craft Benefits Do you want to work at a growing company that invests in its team more than the average employer? Sincere is a family of brands with heart. The Company is home to Punchbowl®, Lovebird®, Timehop®, and Memento®, and builds technology that brings you closer and helps show you care to the people who matter the most. With Sincere Foundation, we support organizations that address basic needs, and envision a future where everyone has the opportunity to celebrate, recognize milestones, and honor memories. We provide a fun, casual, and innovative environment where hard work is recognized and rewarded. What We Offer: - 100% Health, Dental & Vision coverage - 401K Plan with Profit Share - Annual bonus potential - Health & Wellness stipends - Paid time off plus 12 paid holidays & Summer Fridays - Paid parental leave - Childcare benefits (dependent care FSA) - Flexible, hybrid work environment - In-person, all-expenses-paid Team Summits (2X a year) PLEASE NOTE: Our team is primarily based in Greater Boston. We will consider applicants who reside anywhere within a 2 hour drive of the city. While this role is remote, we have occasional in-person meetings at the office (every 4-6 weeks typically). The base salary range for this role is $110,000 - $130,000. Actual salary may vary based on skills and experience.

Title: Senior Full Stack Developer – Generative AI & Autonomous Agents (10036) Toronto, Canada - Hybrid Location: Toronto, Canada Workplace: hybrid Category: Engineering Job Description: We are seeking an experienced Senior Full Stack Developer with deep expertise in backend systems (Java, Python, microservices) and modern UI frameworks (Angular, React) to join our high-performing agile team. This role focuses on building robust, scalable, and user-friendly end-to-end solutions for GenAI applications, combining cutting-edge backend services with intuitive front-end experiences. Key Responsibilities - Full Stack Development: - Design, implement, and optimizeend-to-end solutions for GenAI applications, from backend services to user-facing interfaces. - Build modular and reusable UI components in Angular and React, ensuring responsive and accessible interfaces. - Develop and optimize backend services and APIs (REST, GraphQL, gRPC) to support real-time AI-driven applications. - Backend Engineering: - Architect and maintaindistributed microservices (synchronous and asynchronous) using Java, Python, and FastAPI. - Integrate ML models into scalable, production-ready systems in collaboration with ML engineers and scientists. - Manage workflow orchestration with DAGs and asynchronous task queues. - Implement automated testing, CI/CD pipelines, containerization (Docker, Kubernetes), and cloud-native deployments (AWS, Azure, GCP). - Ensure security, performance optimization, and fault tolerance in backend systems. - Frontend Engineering: - Collaborate with UX and product teams to create human-in-the-loop AI experiences with Angular and React. - Implement robust state management (Redux, NgRx, or equivalent) for real-time, data-intensive applications. - Optimize rendering, bundle size, and performance for enterprise-scale UIs. - Lead UI testing (Jest, Cypress, Playwright, Jasmine, Karma) to maintain quality and reliability. - Collaboration & Leadership: - Work closely with cross-functional teams to deliver cohesive GenAI-powered products. - Mentor junior developers, promote coding standards, and drive best practices across front-end and back-end development. - Communicate effectively with technical and non-technical stakeholders, ensuring transparency and alignment. Qualifications - 10+ years of professional experience as a full stack or combined backend/frontend engineer. - Backend expertise: Strong skills in Java and Python, with experience in microservices and distributed systems. Deep knowledge of FastAPI, OpenAPI, gRPC, and asynchronous workflows. Proficiency with SQL and NoSQL databases, distributed computing (Kafka, Redis, RabbitMQ), and performance optimization. - Frontend expertise: Expert-level experience with Angular and React, including TypeScript, JavaScript (ES6+), HTML5, CSS3/SASS. Strong grasp of state management frameworks (Redux, NgRx, etc.). Proven ability to build responsive, accessible, and performant enterprise UIs. - Cloud & DevOps: Hands-on with AWS/Azure/GCP, Docker, Kubernetes, and CI/CD pipelines. - Strong understanding of security best practices across the stack. - Excellent collaboration, problem-solving, and communication skills.

• Design, model, and implement graph data structures that capture complex system relationships, workflows, and time-dependent processes using Neo4j, Gremlin, or similar tools. • Build and integrate web application back ends and contribute to front-end development as needed to deliver complete, production-ready features. • Develop and maintain robust ETL and data pipelines spanning structured, semi-structured, and unstructured data, with strong attention to data quality. • Engineer real-time and event-streaming workflows that handle high-velocity, sequential data flows. • Deploy and operate enterprise applications in cloud environments using containerization and orchestration, applying DevOps, DataOps, and MLOps practices. • Apply GenAI/ML techniques, including GraphRAG, to graph-related and NoSQL data problems. • Write thorough unit, integration, and API tests to ensure robust, scalable, and maintainable solutions. • Run simulations and apply advanced analytics in Python to solve complex mission problems. • Align data engineering approaches with large-scale interconnected systems to ensure adaptability and scalability.

Role Description Über die Position: Fullstack Web-Entwickler/in mit Fokus Nuxt / Vue.js (m/w/d) - Selbstständiges Entwickeln von Greenfield-WebApps oder Brownfield-Anpassungen von A bis Z — je nach Projekt alleine oder im Team - Umsetzung von UI-Designs (aus Figma) oder User Stories (aus Notion/Jira) in funktionale, responsive Frontends mit Vue.js / Nuxt - Anbindung bestehender REST-APIs sowie ggf. Aufbau neuer Schnittstellen - Wartung, Optimierung und Erweiterung bestehender Vue/Nuxt-Projekte - Planung und Skizzierung von Komponenten- und Frontend-Architektur in enger Abstimmung mit Projektmanagement & ggf. Tech-Lead - Aufwandseinschätzungen zu einzelnen Tasks, Features oder kompletten Projekten - Austausch mit dem Projektmanagement sowie ggf. weiteren Devs oder Kundenteams Qualifications - Sehr gute Kenntnisse in Vue.js mit Schwerpunkt auf Nuxt 3 oder Nuxt 4 - Du hast bereits als einziger oder Hauptentwickler eine komplette Fullstack-WebApp mit Nuxt umgesetzt - Fundierte Erfahrung in der Anbindung und Konzeption von REST-APIs - MongoDB-Kenntnisse (z. B. via Mongoose, direkt oder indirekt über bestehende Backends) - Eigenständige, strukturierte Arbeitsweise und Verantwortungsbewusstsein in Projektrollen - Sicherer Umgang mit Git & typischen Dev-Workflows (Branching, PRs, Reviews etc.) - Effizientes Arbeiten mit KI-gestützten Tools (z. B. Cursor, Claude, ChatGPT) — oder Offenheit, dich dort einzuarbeiten - Sehr gute Deutschkenntnisse, damit du dich bei Fragen direkt beim Kunden oder unser Projektmanagement wenden kannst Requirements - Erfahrung mit Tailwind CSS - Kenntnisse in Node.js oder Python für Backend-Tasks - Vorerfahrung mit Tools wie Notion, Jira, Slack oder Miro - Erfahrung in der Zusammenarbeit mit KMU-Kunden oder Agenturen - Grundlagen von DevOps: z.B. Erfahrung mit Docker, GitLab Pipelines und/oder Deployment auf z. B. Hetzner-Servern - Grundkenntnisse in Design/UX (z. B. für kleinere Layout-Anpassungen) Benefits - 100% Remote — arbeite von wo du willst. Unser Office in Aachen steht dir aber jederzeit offen. - Flexible Arbeitszeiten - Abwechslungsreiche Projekte mit renommierten Kunden aus verschiedenen Branchen - Junges, motiviertes und herzliches Team mit flacher Hierarchie und Wertschätzung für gute Arbeit - Große Freiheit in Prozessen & wie du deine Ziele erreichst - Feedback von erfahrenen Entwicklern zum Code & großer interner Austausch zu aktuellen KI-Tools - Beitrag & Einfluss auf Prozesse — du bist nicht irgendein Rädchen, sondern die rechte Hand des Gründers, bringst uns zusammen voran und lernst extrem viel - Auf Wunsch: Spannende Einblicke in Vertrieb, Projektmanagement, Marketing - Sachbezugskarte mit monatlich 50€ steuerfrei - kostenlos tanken, einkaufen, Fitness-Studio o.ä. nach deiner Wahl mit eigener App Innovators Kreditkarte - Hardware nach deinen Wünschen & Bedarf (z.B. Laptop, Monitor, Headset) - Weiterbildungsmöglichkeiten wie Videokurse & Events/Fortbildungen - Einladung zu coolen regelmäßigen Team-Events, die du selbst mitgestaltest inkl. Unterkunft