Source Job

$187,000–$271,920/yr
US

  • Building foundational capabilities that power the product ecosystem.
  • Focusing on critical platform services like analytics and feature flagging.
  • Defining the approach to distributed platform services.

SaaS Backend API Design Golang Ruby

20 jobs similar to Senior Full Stack Engineer, App Platform

Jobs ranked by similarity.

US

  • Build and evolve the core infrastructure that Calendly's products depend on.
  • Focus on critical platform services including core calendar data API development.
  • Partner with product engineering teams to translate needs into robust solutions.

Calendly's product simplifies scheduling. They empower millions to connect with ease and efficiency.

Canada

  • Design, implement, and maintain scalable platform services and APIs.
  • Build and improve APIs and plugin frameworks enabling partner integrations.
  • Improve platform reliability, observability, and application performance.

HappyCo builds mobile and cloud solutions to enable real-time property data. Their flagship product suite 'Happy Property’ has more than 5 million units on its platform and they strive to build better communities with an inclusive, supportive culture where people can grow their careers.

Global 5w PTO 14w maternity

  • Own and evolve the uptime monitoring platform to enhance customer capabilities.
  • Deploy a Clickhouse instance to capture check run logs and design APIs for reporting.
  • Collaborate with customers to resolve bugs affecting their infrastructure.

Jobgether is a platform posting jobs on behalf of partner companies. We use AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements.

$110,000–$140,000/yr
US Unlimited PTO

  • Build and operate data services driving our applications and APIs
  • Collaborate with team members and across Engineering to iteratively prototype and develop new functionality
  • Partner with product managers and other Zusers

Zus is a shared health data platform designed to accelerate healthcare data interoperability by providing easy-to-use patient data via API, embedded components, and direct EHR integrations. They aim to catalyze healthcare's greatest inventors by maximizing the value of patient insights.

$187,000–$271,920/yr
US

  • Own end-to-end features across the stack, with a strong emphasis on frontend: from collaborating on UX flows and designs, to building React/TypeScript UIs, to wiring those experiences into backend APIs and services.
  • Collaborate closely with Product, Design, and other engineers to break down problems, refine requirements, and ship incremental value behind feature flags and experiments.
  • Contribute to backend APIs and services : extend existing endpoints or services (e.g., in Node.js or Rails), design new data contracts, and ensure that backend changes are observable, well-tested, and resilient.

Calendly provides a platform for scheduling meetings. Millions of people rely on Calendly's products, and they are in the midst of their growth curve.

Americas APAC EMEA Unlimited PTO

  • Design and implement edge traffic routing that directs requests to the correct Cell in a way that's transparent to users.
  • Build and evolve the Topology Service that serves as the authoritative source of cluster state for routing, resource assignment, and Cell lifecycle decisions.
  • Operate and improve the routing and topology systems you build by participating in tier-2 on-call, responding to escalated incidents, and strengthening observability and operational tooling.

GitLab is the intelligent orchestration platform for DevSecOps that enables organizations to increase developer productivity, improve operational efficiency, reduce security and compliance risk, and accelerate digital transformation. GitLab's high-performance culture is driven by their values and continuous knowledge exchange, enabling their team members to reach their full potential while collaborating with industry leaders to solve complex problems.

Europe

  • Develop a strong understanding of Workera's AI-powered platform, customers, and business model.
  • Actively lead and deliver your first full project, owning backend architecture, build, and rollout end-to-end.
  • Architect and own backend systems that are robust, performant, and built to scale.

Workera is redefining how enterprises understand, develop, and mobilize talent in the age of AI. The company is a fast-growing, Series B Silicon Valley company building AI-native skill assessments for the world’s largest organizations, with clients including Samsung, Siemens Energy, and the U.S. Air Force.

$156,400–$227,424/yr
US

  • Working on features targeted at high impact enterprise customers.
  • Contributing to platform scaling initiatives.
  • Improving Engineering practices.

Calendly is a meeting scheduling platform that helps individuals and teams streamline their scheduling process. They are experiencing exciting product growth and are looking for people to learn, grow, and do their best work.

Americas APAC Unlimited PTO

  • Design, build, and maintain a unified Go-based instrumentation service.
  • Own the responsibility for handling the sending, transit, and quality of instrumentation data across the system.
  • Train and support product development teams across the company on how to instrument their features using the unified service.

GitLab is the intelligent orchestration platform for DevSecOps. They enable organizations to increase developer productivity, improve operational efficiency, reduce security and compliance risk, and accelerate digital transformation. They have 50 million registered users and embrace AI.

US Canada

  • Collaborate with exceptional engineers on building systems and services for the world's largest companies.
  • Lead architecture for distributed services at scale that synchronize shared state across clients.
  • Drive cross-team technical alignment via design docs and decision records; unblock execution across org boundaries.

Webflow is building the world’s leading AI-native Digital Experience Platform. They are a remote-first company built on trust, transparency, and creativity, empowering teams to design, launch, and optimize for the web without barriers.

$1,500–$2,500/mo
US Europe

  • Build and improve Go microservices and backend APIs.
  • Be responsible for backend features end-to-end, from implementation to production.
  • Contribute to backend architecture, performance, and reliability.

Vektor TMS is a logistics software company that builds operational software for carriers and freight brokers across the U.S. and Europe. Their platform brings dispatch, tracking, billing, settlements, payouts, and analytics into one system.

US

  • Be instrumental in building the foundational capabilities that power Calendly’s product ecosystem.
  • Define and evolve Calendly's shared React architecture, package ecosystem, and developer experience.
  • Contribute to engineering standards, strengthen the reliability of the frontend infrastructure, and build resilient tooling.

Calendly provides a platform that millions of people rely on for scheduling. They are in a period of exciting product growth and offer opportunities to learn and grow alongside talented colleagues.

Europe 5w PTO

  • Lead the global platform team and set the technical direction.
  • Modernize the stack, consolidate legacy systems, and scale the platform.
  • Build and operate everything with AI-native engineering at the foundation.

Docplanner connects patients with doctors and integrates smart tools to provide quicker, more precise diagnoses and treatments. They are leaders in 13 countries with over 2,500 employees.

Global Unlimited PTO

  • Help self-managed customers run GitLab reliably.
  • Make GitLab easier to deploy and more secure by default.
  • Improve installation, upgrade, and day-to-day operations.

GitLab is the intelligent orchestration platform for DevSecOps. They enable organizations to increase developer productivity, improve operational efficiency, reduce security and compliance risk, and accelerate digital transformation. More than 50 million registered users trust them.

Global

  • Contribute to our core product, working across our stack primarily in Go, on services that power our applications.
  • Design and refine technical systems, including microservices, customer interfaces, and automated tests.
  • Collaborate closely across disciplines to explore problems, prototype ideas, and iterate quickly.

Humanitec is at the forefront of the Platform Engineering revolution, as enterprise companies across the globe re-shape how they manage their cloud infrastructure. Their mission is to help platform engineering teams build Internal Developer Platforms that unlock true developer self-service.

$170,000–$190,000/yr
US

  • Own the evolution of major subsystems, including GraphQL APIs, event-driven service communication (EventBridge/SQS), and data scaling.
  • Deliver primary technical contributions across Ruby/Rails APIs, SvelteKit/TypeScript frontends, and AWS serverless infrastructure.
  • Optimize our serverless background processing framework, currently supporting 400+ Lambda-backed workers.

KnowBe4 is a cybersecurity company that puts security first and provides an AI-driven Human Risk Management platform, empowering organizations to strengthen their security culture. They have unusually high customer retention rates and recognition as a Leader by G2 and TrustRadius.

$102,029–$130,618/yr
Canada

  • Designing and building scalable backend services in Go, working with PostgreSQL and DynamoDB, implementing event-driven architectures with RabbitMQ, and owning production systems end-to-end
  • Building exceptional user experiences across our mobile app (Angular/Ionic), web app (React), and admin tools
  • Owning the full implementation of features, from database schema design and API development to implementing the corresponding UI changes, eliminating handoffs and shipping complete solutions

KOHO's mission is to make financial services better for every Canadian by offering transparent, user-friendly products. They foster a remote-first, high-trust environment that values work-life integration and bold thinking.

$128,000–$200,000/yr
US Canada UK

  • Lead the design and delivery of platform services and libraries that teams across Jane adopt and rely on, balancing transformational work with new capability building.
  • Drive improvements to the main Rails monolith - upgrading dependencies, improving architecture, and raising code quality standards so teams can move with confidence.
  • Partner with feature teams to understand their needs, propose scalable solutions, and mentor them through implementation, removing blockers along the way.

Jane is a founder-led, high-growth SaaS company that builds products and tools for clinics to run their businesses and care for their patients. They are a team of more than 700 people working remotely across Canada, the US, and the UK, and embrace the possibilities of AI.

$103,174–$117,720/yr
Canada

  • Lead efforts to scale and improve our infrastructure.
  • Develop and support internal team tooling.
  • Troubleshoot, debug and resolve issues as part of a shared on-call rotation.

Lillio, formerly HiMama, empowers early childhood educators through innovative tools. They are a Series B, private-equity backed company recognized as an industry leader and selected in 2025 by Time Magazine as one of the world's top EdTech companies.

Canada

  • Design and implement scalable, secure, and maintainable backend systems primarily using Ruby on Rails.
  • Lead the architecture and development of backend services with a strong focus on performance, reliability, and long-term maintainability.
  • Identify systemic technical debt, architectural constraints, or operational inefficiencies that slow development or impact customer experience, and lead cross-team efforts to address them.

NovoEd is an enterprise learning platform that helps organizations build critical capabilities at scale through collaborative and experiential learning. Founded in 2012 out of Stanford’s Social Algorithm Laboratory, NovoEd has grown into a trusted partner for many of the world’s leading companies, executive education providers, and training organizations.