Senior Backend Developer jobs in Longmont, CO

Remote or Hybrid in Washington, District of Columbia

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Today

Job Title: Senior Backend Developer Location: Washington, DC (Remote) Type: Contract About the Role: We re seeking a hands-on Java backend developer (5-8 yrs experience) to design, build, and maintain APIs and integrations for identity/security systems. Experience with IBM ISIM, SailPoint, or similar tools is a plus. Responsibilities: Develop and maintain REST/SOAP APIs and integrations for IBM Security Verify Governance Suite (ISIM/ISAM). Support existing services and build new security system

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Contract

BASED ON EXPERIENCE

Sr. Backend Developer - Java

Remote or Hybrid in Chicago, Illinois

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Today

Senior Backend Java developer 3 months Full remote Interview process: 2 rounds Expected start date: December 1, 2025 Requirements: Proficiency in Java 17+ and related frameworks (Maven, Gradle, Spring, Springboot) Experience working with distributed systems (communication patterns, observability, event-based architectures) Experience working with Kafka Experience with relational databases (MySQL, PostgreSQL) Experience writing unit and integration tests using the Junit framework Good understa

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Contract

$50 - $55 hr

Remote Senior Backend Developer | New Gen AI Product Development Oracle Health

Remote

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Today

Job Description As a Senior Member of Technical Staff, you will be a key contributor to the development and success of our next-generation CDA platform, which leverages the power of generative AI and cloud-native technologies. Your expertise in data platform engineering will drive the creation of a robust and intelligent system, enhancing the healthcare experience for patients and clinicians alike. Responsibilities Responsibilities: Design and implementation of the CDA data platform, ensurin

Full-time

USD 79,200.00 - 178,100.00 per year

Senior Software Engineer, Backend (Developer - x402)

Remote

•

Today

Ready to be pushed beyond what you think you're capable of? At Coinbase, our mission is to increase economic freedom in the world. It's a massive, ambitious opportunity that demands the best of us, every day, as we build the emerging onchain platform - and with it, the future global financial system. To achieve our mission, we're seeking a very specific candidate. We want someone who is passionate about our mission and who believes in the power of crypto and blockchain technology to update the

Full-time

USD 186,065.00 - 218,900.00 per year

Senior Backend Java Developer VP

Remote or Irving, Texas

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Today

The Applications Development Technology Lead Analyst is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to lead applications systems analysis and programming activities. Responsibilities: Partner with multiple management teams to ensure appropriate integration of functions to meet goals as well as identify and define necessary system enhancements

Full-time

USD 125,760.00 - 188,640.00 per year

Senior Software Engineer, Backend (Developer - Foundations)

Remote

•

Today

Full-time

USD 186,065.00 - 218,900.00 per year

Senior Python Back End Developer

Remote or Toronto, Ontario

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Today

Our client seeks an Senior Quality Engineer for a Full Time project in Toronto, ON. Below is the detailed requirement Title: Senior Quality Engineer Location : Toronto, ON Duration: Full Time Job Description: Bachelor's degree preferably in Computer Science, Information technology, Computer Engineering, or related IT discipline or equivalent experience with 12+ Minimum Experience QA Engineer with solid mobile testing and API testing & Banking experience . 6+ years of software testing experienc

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Full-time, Third Party

$DOE

Senior Node.js Microservices Backend Developer

Remote

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11d ago

Title- Fullstack Node JS Developer Location- REMOTE Must skills- node js+ typescript+ react js, algorithms and data structure. Title: Senior Node.js Microservices (Backend) Developer We are looking for a highly skilled Senior Node.js Microservices Developer with expertise in building microservices using Node/Java and GO. The ideal candidate will have a minimum of 6 years of experience in Node.js development, with expert-level proficiency, and a strong understanding of building highly scalable sy

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Contract

Depends on Experience

Senior .NET Developer / Boulder, CO

Boulder, Colorado

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Today

A leading technology company based in Colorado is seeking a Senior Software Engineer to join their team. This role is ideal for an experienced backend developer passionate about building scalable, high-performance systems using modern Microsoft technologies. You'll be responsible for designing and developing robust APIs, optimizing database performance, and driving backend architecture for core business applications. The ideal candidate will bring 7+ years of hands-on experience in backend devel

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Full-time

150k - 180k

Senior-Staff Backend Engineer

Remote

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Today

Senior Staff Backend Engineer Location: Remote (US or Canada : EST Time Zone only)Type: Contract to Hire (C2H) There is no sponsorship available. No agencies or C2C. Please do not submit candidates. Join a team reshaping how people invest. Our client is an established player in the alternative investments space, empowering individuals to access private markets through an intuitive and powerful digital platform. They're passionate about simplifying private investing, making it smarter, faster, an

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Contract

$10 - $90 per hour

Sr. Full Stack Developer

Hybrid in Boulder, Colorado

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29d ago

Candidates must be authorized to work in the U.S. on a permanent basis.Visa sponsorship is not available for this position. About the RoleWe re looking for a Senior Backend Software Engineer who s excited to get their hands dirty, solve real problems, and move fast. You ll play a critical role on a small, highly collaborative team working on products that directly impact our partners and customers. This isn t a siloed role we want someone who s not just comfortable, but energized by jumping into

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Full-time

$140,000 - $170,000

Senior Backend Engineer / Remote / Go / GraphQL / AI Startup

Remote or Los Angeles, California

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Today

Job Description An early-stage startup is hiring a Senior Backend Engineer (Go) for a full-time remote role to help build a next-generation communication platform from the ground up. The product is designed to make team collaboration faster, smarter, and more focused by deeply integrating AI into the core user experience. This is a rare chance to join a well-funded founding team with a strong track record in scaling products used by millions. You'll be part of a small, fast-moving engineering gr

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Full-time

180k - 220k

Sr. Backend Engineer C++ - (Hybrid)

Remote or Chicago, Illinois

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Today

FreeWheel, a Comcast company, provides comprehensive ad platforms for publishers, advertisers, and media buyers. Powered by premium video content, robust data, and advanced technology, we're making it easier for buyers and sellers to transact across all screens, data types, and sales channels. As a global company, we have offices in nine countries and can insert advertisements around the world. Job Summary FreeWheel is looking for passionate Sr. Backend Engineers to help design, build and suppo

Full-time

USD 126,788.71 - 190,183.07 per year

Backend Java Senior Software Developer - Remote Opportunity

Remote

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Today

Job Description We are seeking a Senior Software Developer to work on the Backend of the next generation Oracle Health Clinical Applications. Help architect and operate the core services behind Oracle Health's mission-critical platforms. You'll design highly available, multi-tenant microservices and versioned enterprise APIs, engineer data models across SQL/NoSQL systems, and deliver rock-solid reliability at scale. From performance tuning and observability to security-by-design and automation-

Full-time

USD 79,800.00 - 178,100.00 per year

Senior/ Principal Member of Technical Staff - Backend Developer - Remote

Remote

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Today

Job Description We are seeking a back end developer to work on the front end of the next generation Oracle Health Clinical Applications. Help architect and operate the core services behind Oracle Health's mission-critical platforms. You'll design highly available, multi-tenant microservices and versioned enterprise APIs, engineer data models across SQL/NoSQL systems, and deliver rock-solid reliability at scale. From performance tuning and observability to security-by-design and automation-first

Full-time

USD 96,800.00 - 223,400.00 per year

Mid Back End Developer

Remote

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Today

Job Number: R0227431 Back End Developer, Mid The Opportunity: As a back-end developer, you know that a good site or system needs the right combination of clean code, APIs, analytics, and infrastructure to develop a user-focused solution. We're looking for an experienced back-end developer with the software engineering skills it takes to identify potential risks, contribute to solution development, and create efficient and effective systems for our clients. As a back-end developer at Booz Allen,

Full-time

USD 69,400.00 - 158,000.00 per year

Senior Backend Engineer (MTS 1)

Remote or Austin, Texas

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Today

At eBay, we're more than a global ecommerce leader - we're changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We're committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts. Our customers are our compass, authenticity thrives, bold ideas are welcome, and everyone can bring their unique selves to work - every day. We're in this together, sustaining the futur

Full-time

USD 115,200.00 - 199,700.00 per year

Blockchain Senior Backend Engineer - Innovation Labs

Remote or New York, New York

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Today

Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you'll have the opportunity to grow your career, give back to your community and make a real impact. Job Overview An Innovation Labs Digital Assets Application Senior Engineer must be a highly motivated and proactive hands-on software engineer (Back End, JavaFocus), have a proven ability and experience working wit

Full-time

USD 142,320.00 - 213,480.00 per year

Senior Node.JS Backend Engineer Data Engineering

Remote

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7d ago

Client: EdTech Organization Title: Senior Node.JS Backend Engineer Data Engineering Location: 100% Remote Duration: Long Term Ideal Profile: seeking a strong developer with recent experience developing in AWS environment using JavaScript/Node.js along with BIG DATA - this team is ALL ABOUT DATA optimization. They seek a software engineer with a recent and strong experience developing in AWS environment using JavaScript/Node.js. Seeking an engineer who will also work on test automation and aroun

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Contract

$70 - $80

Senior, Software Engineer - Backend

Remote or Bentonville, Arkansas

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Today

Position Summary What you'll do Immigration sponsorship is not available for this role. This is a full-time, onsite role at our Bentonville, AR office. This position is not eligible for remote work. About the Team Our team partners closely with Walmart International, which operates more than 5,900 retail units across 26 countries under 55 banners - including Africa, Argentina, Canada, Central America, Chile, China, India, Japan, and Mexico. We're part of the International and Omni Tech organ

Full-time

USD 90,000.00 - 180,000.00 per year

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Senior Backend Developer jobs in Longmont, CO, USA