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Top Senior Full-Stack Engineer Jobs in Seattle

173+ Job Results
23 Hours Ago
Seattle, WA
Hybrid
4,800 Employees
3-5 Years of Experience
4,800 Employees
3-5 Years of Experience
Fintech • Mobile • Software • Financial Services
Seeking a highly motivated and experienced Senior Fullstack Engineer (Contract) to join the Account Creation team at a next-generation financial services company. Responsible for full stack development, front-end and back-end development, architecture and design, testing and quality assurance, continuous improvement, code review and mentorship, and documentation.
Top Benefits:
401-K
Child Care Benefits
Commuter Benefits
+45 More
4 Days Ago
Seattle, WA
Hybrid
4,800 Employees
3-5 Years of Experience
4,800 Employees
3-5 Years of Experience
Fintech • Mobile • Software • Financial Services
Seeking a highly motivated and experienced Senior Fullstack Engineer to join our Account Creation team. Responsible for designing and implementing end-to-end solutions, both front-end and back-end. Strong sense of ownership, self-starter, and mentor. Collaborate with cross-functional teams to deliver high-quality software applications.
Top Benefits:
401-K
Child Care Benefits
Commuter Benefits
+45 More
7 Days Ago
Seattle, WA
Remote
350 Employees
7+ Years of Experience
350 Employees
7+ Years of Experience
Artificial Intelligence • Legal Tech • Professional Services • Software
Ontra is seeking a Senior Full Stack Software Engineer to build and maintain web-based applications using Ruby on Rails and Ember.JS. The ideal candidate should have 7+ years of experience as a fullstack software engineer and a strong foundation in software development fundamentals.
Top Benefits:
401-K
Commuter Benefits
Company Equity
+39 More
11 Days Ago
Seattle, WA
Remote
12,000 Employees
139K-245K Annually
3-5 Years of Experience
12,000 Employees
139K-245K Annually
3-5 Years of Experience
eCommerce • Fintech • Hardware • Payments • Software • Financial Services
As a Senior Full-Stack Engineer, you will be responsible for designing, building, and owning sophisticated underwriting services to expand access to credit for Square's sellers. You will work on backend systems with contributions to the frontend, collaborating with product, data science, and other teams to innovate new lending products.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
23 Hours Ago
Seattle, WA
Remote
1,400 Employees
138K-252K Annually
3-5 Years of Experience
1,400 Employees
138K-252K Annually
3-5 Years of Experience
Aerospace • Artificial Intelligence • Hardware • Robotics • Security • Software • Defense
Anduril Industries is seeking a Senior Full Stack Software Engineer to work on building out the software ecosystem supporting an electronic warfare platform. Responsibilities include architecting new features end-to-end, testing web app features, turning requirements into web application features, and collaborating with developers across the stack.
Top Benefits:
401-K
Adoption Assistance
Child Care Benefits
+56 More
5 Hours Ago
Seattle, WA
5,000 Employees
139K-188K Annually
5-7 Years of Experience
5,000 Employees
139K-188K Annually
5-7 Years of Experience
Gaming • Software • Virtual Reality
Seeking a Senior Full-Stack Developer to work on the decoupled CMS architecture for Unity websites. Responsibilities include building/maintaining CMS, migrating features, collaborating with distributed teams, and enabling experimentation on websites. Strong web development experience with ReactJS, CMS knowledge, and Agile methodologies are required. Additional experience in A/B testing, Storybook, Tailwind CSS, and automated testing is a plus.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
16 Hours Ago
Seattle, WA
Remote
4,800 Employees
155K-178K Annually
7+ Years of Experience
4,800 Employees
155K-178K Annually
7+ Years of Experience
Fintech • Mobile • Software • Financial Services
Research, design, and develop computer and network software. Update and enhance existing software capabilities. Work on full-stack development including front-end and back-end technologies. Collaborate with engineering and product stakeholders to build financial products and tools. Mentor other engineers, support technical culture, and help grow the team.
Top Benefits:
401-K
Child Care Benefits
Commuter Benefits
+45 More
7 Days Ago
Seattle, WA
2,700 Employees
180K-225K Annually
7+ Years of Experience
2,700 Employees
180K-225K Annually
7+ Years of Experience
eCommerce • Fintech • Payments • Software • Financial Services
The role involves leading the technical strategy and systems of the Customer Success Technology engineering team, designing and implementing frontend components using React or Angular, developing responsive user interfaces, contributing to software architecture, and maintaining engineering standards.
Top Benefits:
401-K
401-K Matching
Commuter Benefits
+48 More
23 Hours Ago
Seattle, WA
Remote
10,000 Employees
115K-175K Annually
5-7 Years of Experience
10,000 Employees
115K-175K Annually
5-7 Years of Experience
Cloud • Information Technology • Sales • Security • Cybersecurity
Seeking a Full Stack Engineer with 5-7 years of experience in software development for SaaS environments. Must have expertise in backend and frontend coding, UI technologies, high-level programming languages, automation, and database technologies. Strong understanding of object-oriented programming, distributed systems, and scalability is required. Bonus points for knowledge of IoT/ICS systems, Linux, cloud services, and endpoint security.
23 Hours Ago
Seattle, WA
Remote
12,000 Employees
168K-297K Annually
5-7 Years of Experience
12,000 Employees
168K-297K Annually
5-7 Years of Experience
eCommerce • Fintech • Hardware • Payments • Software • Financial Services
Square is seeking a Senior Backend Software Engineer for the Payment Pricing & Cost Platform team. This role involves designing scalable systems related to pricing and costs, collaborating with cross-functional teams, and contributing to Square's global payments strategy. The ideal candidate should have 5+ years of experience, be curious, and interested in creating highly available, scalable data systems.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
137K-233K Annually
3-5 Years of Experience
20,000 Employees
137K-233K Annually
3-5 Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Build high-quality, clean, scalable, and reusable code, work with product owners to understand requirements, mentor colleagues, contribute to new products and features
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
9 Days Ago
Seattle, WA
Remote
45 Employees
3-5 Years of Experience
45 Employees
3-5 Years of Experience
Logistics • Productivity • Software • Analytics
Seeking a Senior Fullstack Engineer to take ownership of projects spanning various systems, work closely with Product and Design teams, drive best practices in Frontend development, and mentor other engineers.
Top Benefits:
401-K
Company Equity
Company Outings
+20 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
137K-233K Annually
5-7 Years of Experience
20,000 Employees
137K-233K Annually
5-7 Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Build high-quality, clean, scalable and reusable code by enforcing best practices. Work with product owners to deliver high-quality products. Mentor colleagues and promote knowledge-sharing. 5+ years of software engineering experience with JavaScript, Java. Experience with UI frameworks like Angular, React, or Vue. Analytical and design skills.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
9 Days Ago
Seattle, WA
Remote
45 Employees
157K-190K Annually
3-5 Years of Experience
45 Employees
157K-190K Annually
3-5 Years of Experience
Logistics • Productivity • Software • Analytics
Senior Fullstack Engineer role at Logixboard, a white-labeled customer experience software company revolutionizing the freight forwarding industry. Responsibilities include owning projects, system integrations, data modeling, collaboration with Product and Design teams, mentoring team members, and driving best practices in Frontend development. Required experience in software engineering best practices, frontend development, modular JavaScript applications, and working with 3rd party data providers. Curiosity and willingness to learn new technologies.
Top Benefits:
401-K
Company Equity
Company Outings
+20 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
143K-250K Annually
5-7 Years of Experience
20,000 Employees
143K-250K Annually
5-7 Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Build high-quality, clean, scalable, and reusable code, work with product owners to understand requirements, design software for customer customization, contribute to product design and implementation, mentor colleagues, manage projects with technical risk.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
11 Days Ago
Seattle, WA
Remote
Hybrid
12,000 Employees
139K-245K Annually
3-5 Years of Experience
12,000 Employees
139K-245K Annually
3-5 Years of Experience
eCommerce • Fintech • Hardware • Payments • Software • Financial Services
Design, build, and own sophisticated underwriting services leveraging data and machine learning technologies to originate and approve lending products for Square sellers. Collaborate with product, data science, and engineering teams to enable innovative lending initiatives and products. Modernize underwriting processes to be cloud-first and scalable for future growth. Ensure security and compliance standards are met for customer data.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
9 Days Ago
Seattle, WA
Remote
45 Employees
3-5 Years of Experience
45 Employees
3-5 Years of Experience
Logistics • Productivity • Software • Analytics
Senior Fullstack Engineer responsible for owning projects spanning across systems, system integrations, data modeling, and collaborating with Product and Design teams to deliver high-quality user experiences. Must have 3-5+ years of experience with software engineering best practices and expertise in React, Node.js, and TypeScript technologies.
Top Benefits:
401-K
Company Equity
Company Outings
+20 More
11 Days Ago
Seattle, WA
Remote
Hybrid
12,000 Employees
139K-245K Annually
3-5 Years of Experience
12,000 Employees
139K-245K Annually
3-5 Years of Experience
Blockchain • eCommerce • Fintech • Payments • Software • Financial Services • Cryptocurrency
Design, build, and own sophisticated underwriting services leveraging data and machine learning technologies to originate and approve lending products. Collaborate with product, data science, and engineering teams to enable innovative lending products. Modernize underwriting processes to be cloud-first and maintain highest standards of security and compliance.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
11 Days Ago
Seattle, WA
Remote
12,000 Employees
139K-245K Annually
3-5 Years of Experience
12,000 Employees
139K-245K Annually
3-5 Years of Experience
Blockchain • eCommerce • Fintech • Payments • Software • Financial Services • Cryptocurrency
Design, build, and own sophisticated underwriting services for Square's Credit Underwriting Team. Collaborate with product, data science, and engineering teams to enable innovative lending products. Work on modernizing the underwriting process and building secure systems for customer data.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
159K-278K Annually
5-7 Years of Experience
20,000 Employees
159K-278K Annually
5-7 Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Join the UX Engineering group at ServiceNow as a full-stack software engineer to drive a metadata-based UX framework for next-gen experiences on the NOW platform. Responsibilities include building high-quality, scalable code, working with product owners, designing user-friendly software, contributing to new features, and mentoring colleagues.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
3 Days Ago
Seattle, WA
Remote
Hybrid
12,000 Employees
153K-270K Annually
1-3 Years of Experience
12,000 Employees
153K-270K Annually
1-3 Years of Experience
eCommerce • Fintech • Hardware • Payments • Software • Financial Services
As a staff software engineer on the Web Payment Experience team at Square, you will mentor and teach other engineers, set technical direction for the team, develop JavaScript APIs and UIs, work on tokenization platforms, and build reliable and delightful experiences for developers and merchants.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
181K-317K Annually
7+ Years of Experience
20,000 Employees
181K-317K Annually
7+ Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Build high-quality, clean, scalable and reusable code by enforcing best practices around software engineering architecture and processes. Work with product owners to understand requirements, design, implement, and deliver high-quality products. Mentor colleagues and promote knowledge-sharing.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
5 Hours Ago
Seattle, WA
Remote
12,000 Employees
139K-245K Annually
5-7 Years of Experience
12,000 Employees
139K-245K Annually
5-7 Years of Experience
eCommerce • Fintech • Hardware • Payments • Software • Financial Services
As a Senior Software Engineer on the Square Credit Card Team, you will be responsible for expanding access to Square Credit Card for sellers and designing features to differentiate the product. You will work on building sophisticated financial systems and highly available services, collaborating with team peers, cross-functional partners, and adjacent engineering teams.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+55 More
16 Hours Ago
Seattle, WA
Remote
20,000 Employees
143K-250K Annually
5-7 Years of Experience
20,000 Employees
143K-250K Annually
5-7 Years of Experience
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
Seeking Staff Software Engineer with 6+ years of front-end software development experience to design and develop a data analytics platform using cutting-edge technologies. Responsibilities include leading product design, standardizing processes, and researching new technologies for scalability and productivity. Must have expertise in JavaScript, ReactJS, NodeJS, Java, and BI tools.
Top Benefits:
401-K
401-K Matching
Adoption Assistance
+42 More
9 Days Ago
Seattle, WA
Remote
45 Employees
3-5 Years of Experience
45 Employees
3-5 Years of Experience
Logistics • Productivity • Software • Analytics
Senior Fullstack Engineer responsible for owning projects spanning across various systems, developing system integrations, modeling and normalizing data, collaborating with product and design teams, driving best practices in frontend development, and mentoring other engineers. Required 3-5+ years of experience with software engineering best practices, strong attention to detail, experience in JavaScript applications, working with 3rd party data providers, and common technologies in the tech stack.
Top Benefits:
401-K
Company Equity
Company Outings
+20 More
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