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Top Full-Stack Engineer Jobs in Denver & Boulder, CO
Fintech • Information Technology • Insurance • Financial Services • Big Data Analytics
Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.
Top Skills:
.NetAgileC#Ci/CdGitJavaScriptJestNode.jsNunitReactSdlcSQL ServerTypescriptWeb Apis
Cloud • Fintech • Food • Information Technology • Software • Hospitality
Build and ship customer-facing products across backend services, APIs, data models, React web interfaces, and Android point-of-sale applications. Learn unfamiliar platforms quickly, collaborate with product and design, deliver resilient code, and own testing, instrumentation, on-call support, and cleanup. The role emphasizes 0-to-1 product development, customer-focused decision-making, rapid experimentation, and using AI tools to improve development velocity and quality.
Top Skills:
Ai ToolsAndroidAPIsAsynchronous CommunicationDistributed SystemsEvent-Driven ArchitectureJavaKotlinReact
Edtech • Fintech • Payments • Social Impact • Financial Services • Big Data Analytics
Build and maintain scalable e-commerce and marketplace features across Node.js, React, MySQL, and MongoDB. Own complex features end to end, design backend services and APIs, integrate PunchOut procurement systems, improve platform security and reliability, conduct code reviews, and mentor engineers. The role requires strong full-stack JavaScript and TypeScript expertise, e-commerce domain experience, and the ability to work autonomously on high-volume transactional software.
Top Skills:
CoupaCxml PunchoutGraphQLJaggaerJavaScriptMongoDBMySQLNest.JsNext.JsNistNode.jsOciOracle ProcurementPci-DssReactRestSap AribaSoc 2Typescript
Information Technology • Productivity • Software • Infrastructure as a Service (IaaS)
Build scalable, data-intensive products from the ground up, focusing on Java/Kotlin backend services, REST or GraphQL APIs, data access, and React/TypeScript interfaces. Responsibilities include architecture, performance optimization, testing, observability, production troubleshooting, technical documentation, and end-to-end feature ownership. Collaborate with data, reporting, design, and product teams while using AI-assisted development tools to accelerate delivery.
Top Skills:
APIsCaching LayersCSSGraphQLGrpcHTMLJavaJavaScriptKotlinObservability ToolsReactRelational DatabasesRestSQLTypescript
Cloud • Fintech • Food • Information Technology • Software • Hospitality
Develop fullstack web applications, enhance platform performance, collaborate on high-impact opportunities, and ensure stable, scalable solutions. Engage in rapid iterations and be a committed team player.
Top Skills:
AWSBootstrapCSSDockerFigmaGitJavaJavaScriptKotlinNode.jsReactSketchTailwind
Computer Vision • Fintech • Hardware • Internet of Things • Machine Learning • Software • Transportation
Build and maintain the full-stack platform connecting Blissway hardware to drivers, partners, and agencies. Own public user surfaces, partner integrations (DMVs, mailhouses, fleet vendors, ACH), platform/deployment tooling, service infrastructure, and internal access management. Ensure secure, robust, production-ready systems and tooling that support a fast-moving, small engineering team.
Top Skills:
Ach Payment ProcessingAuthentication/Identity ManagementDevOpsIotPythonSaaSTypescript
16 Days AgoSaved
Easy Apply
Easy Apply
Big Data • Fintech • Mobile • Payments • Financial Services
Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.
Top Skills:
AndroidiOSJavaScriptKotlinReact Native
Aerospace • Artificial Intelligence • Computer Vision • Software • Analytics • Defense • Big Data Analytics
Design, develop, test, deploy, and support scalable full-stack cloud-native applications using Java, Spring Boot, Vue.js, Python, and FastAPI. Build secure APIs and operate AWS applications with Docker, Kubernetes, and Infrastructure as Code. Collaborate with product, systems, and architecture teams to deliver features end to end. Apply AI-assisted development throughout coding, testing, debugging, code review, and documentation while validating quality, security, and maintainability.
Top Skills:
AngularAWSAws CdkCi/CdCloudFormationDevOpsDockerFastapiGCPInfrastructure As CodeJavaKubernetesPostgresPythonReactRest ApisSpring BootTerraformVue
18 Days AgoSaved
Easy Apply
Easy Apply
Cloud • Security • Software • Cybersecurity • Automation
Leads technical direction and develops fullstack purchase experiences using Ruby on Rails and Vue.js. Designs resilient transactional flows, integrates billing and CRM systems, improves reliability and rollout safety, mentors engineers, reviews code, reduces technical debt, and participates in incident response. Partners with Product, Design, Billing, and Support to improve GitLab’s purchase, subscription, discount, and upgrade workflows.
Top Skills:
Ruby On RailsVue
23 Days AgoSaved
Easy Apply
Easy Apply
Sales • Software • Travel
Own the specification, design, and implementation of features for FareHarbor’s large-scale web application. Collaborate with product team members, develop scalable and performant full-stack solutions, improve automated testing, resolve technical challenges, and participate in code reviews. The role requires strong Python and JavaScript skills, experience with front-end and back-end frameworks, relational databases, performance optimization, and agile development.
Top Skills:
AngularjsDjangoJavaScriptPythonRelational DatabasesVue
Aerospace • Artificial Intelligence • Hardware • Machine Learning • Software • Defense • Manufacturing
Own end-to-end full-stack feature development across React/TypeScript interfaces and Elixir backend services for spacecraft modeling, simulation, and ground-control software. Drive architecture, technical debt reduction, performance, reliability, testing, API design, and production deployment. Mentor engineers, establish coding standards, collaborate with product, design, QA, operators, and astrodynamics teams, and deliver complex data-dense, real-time applications.
Top Skills:
BeamCSSElixirExunitFigmaGitGrafanaGrpcHTMLJavaScriptOpentelemetryOtpPostgresPrometheusReactReact Testing LibraryReact Three FiberRestThree.JsTypescriptVitestWebsocket
Aerospace • Artificial Intelligence • Hardware • Machine Learning • Software • Defense • Manufacturing
Contribute to full-stack features for spacecraft mission control and distributed ground control systems. Build React/TypeScript frontends and Elixir backend services, write maintainable and testable code, collaborate with operators, designers, and engineering specialists, and participate in design and code reviews. The role involves smaller, well-defined tasks under senior guidance during a three-month temporary engagement with potential conversion.
Top Skills:
CSSCss-In-JsElixirErlangExunitFigmaGitGraphQLGrpcHTMLJavaScriptJestPostgresReactReact Testing LibraryReact Three FiberRestStorybookThree.JsTypescriptVitestWebsocket
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Software • Defense
Own technical strategy and architectural decisions across multiple engineering squads. Design scalable distributed systems, APIs, data models, and cloud-native platforms while building shared systems that improve delivery. Partner with product and engineering leadership, resolve ambiguous technical challenges, establish AI-assisted development practices, and mentor engineers through design reviews and cross-team collaboration. The role requires full-stack expertise and strong influence, communication, and technical leadership in a high-stakes B2B SaaS environment.
Top Skills:
AbacAWSCi/CdCsvExcelJwtKeycloakKmlKubernetesNode.jsOauth 2.0Openid ConnectPdfPostgresReactRedisRestSaml 2.0Secure Api GatewaysTerraformTypescriptVite
Aerospace • Cloud • Digital Media • Information Technology • Mobile • News + Entertainment • Generative AI
Develop and optimize high-scale Adobe Commerce ecommerce platforms using PHP, JavaScript, Node.js, GraphQL, REST, and MySQL. Separate business logic from presentation layers, improve database and caching performance, build CI/CD validation, monitor production systems with New Relic, and create endurance load tests. Integrate identity, payment, and tax systems while mentoring junior engineers and leading offshore teams.
Top Skills:
Adobe Commerce (Magento) 2.4.XComposerDockerElasticsearchGitGitlab Ci/CdGraphQLJavaScriptMySQLNew RelicNode.jsOpensearchPhp 8.2/8.3PhpcsPing IdentityRabbitMQRecurlyRedisRest ApisSQLVertex
Reposted 26 Days AgoSaved
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Big Data • Fintech • Mobile • Payments • Financial Services
Lead technical direction and delivery for the Acquisition & Onboarding full‑stack team. Build and maintain mobile (React Native/native) and web experiences, backend services at scale, and operational tooling. Drive architecture, mentor engineers, ensure reliability/monitoring/on‑call readiness, collaborate with product and design, and improve dev processes, testing, and release practices to impact conversion and retention.
Top Skills:
Analytics InstrumentationAWSCi/CdExperimentationFeature FlaggingJavaScriptKotlinKubernetesMySQLPythonReactReact NativeSwiftTypescriptVue
Logistics • Software • Transportation
Build and scale backend-focused systems supporting truckload freight operations, including high-volume carrier quotes, automated transactions, distributed services, and APIs. Design scalable data models and architectures, contribute across the React and TypeScript stack, make key technical decisions, mentor engineers, and collaborate with product leadership. The role also involves developing AI-powered logistics tools and maintaining reliable, secure infrastructure on Kubernetes and GCP.
Top Skills:
APIsBigQueryClaude CodeDistributed SystemsDjangoDjango Rest FrameworkEvent-Driven ArchitectureFastapiGithub CopilotGoogle Cloud PlatformKubernetesMaterial UiMicroservicesNext.JsPostgisPostgresPython 3ReactRedisTypescript
Healthtech • Social Impact • Telehealth
Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.
Top Skills:
C#Css ModulesMongoDBNode.jsReact NativeReactScala
Artificial Intelligence • Information Technology • Software • Cybersecurity
The Senior Fullstack Software Engineer will design, implement, and maintain features for Conveyor's SaaS platform, involving both backend and frontend work, while collaborating closely with team members and mentoring juniors.
Top Skills:
AWSPostgresPythonReactRestful ApisRuby On Rails
Artificial Intelligence • Information Technology • Software • Cybersecurity
Design, build, and maintain AI-powered B2B SaaS products across frontend, backend, and AI. Own projects end-to-end, collaborate with product and design, ensure maintainability, mentor teammates, and inform roadmap and implementation decisions.
Top Skills:
Ai Coding ToolsAWSLlmsPostgresPythonReactRestful ApisRuby On Rails
Information Technology • Professional Services • Consulting
Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.
Top Skills:
.Net 6+AngularAzure App ServicesAzure DevopsAzure FunctionsAzure Key VaultAzure Service BusAzure SqlBlazorC#Ci/CdCosmos DbDockerGraphQLGrpcJSONKubernetesOauthReactRest ApisSQL Server
Big Data • Fintech • Mobile • Payments • Financial Services
Develop and ship full-stack web and mobile experiences across Affirm’s consumer app and website. Collaborate with product, design, analytics, and engineering teams to break down projects, make technical decisions, write tested and extensible code, launch scalable APIs, monitor service health, support on-call operations, review code, and participate in team development and interviewing.
Top Skills:
APIsKotlinPythonReactReact NativeVue
Artificial Intelligence • HR Tech • Conversational AI • Automation
Join as an early founding full-stack engineer to architect, build, and deploy a scalable platform serving AI-driven voice applications. You will own frontend and backend development, design infrastructure with the CTO, and deliver reliable production systems for enterprise customers.
Top Skills:
FastapiNextjsPythonReactTailwindcss
Healthtech
Own end-to-end product features for a SaaS platform serving HR, therapists, and employees. Build, scale, and evolve frontend and backend components, lead architecture and standards, collaborate with design and product, and incorporate customer feedback and QA. Work in an early-stage startup environment with product-focused ownership.
Top Skills:
Next.JsPythonReact
Insurance • Legal Tech • Social Impact
As a Fullstack Engineer, you'll design, build, and operate web applications, collaborating with product teams and mentoring peers while ensuring best practices in coding and system architecture.
Top Skills:
AWSCircleCICloud ComputingCSSDockerGCPGoGraphQLHadoopHTMLJavaJavaScriptKubernetesMapreducePythonReactRestRubyScalaSQLWebpack
Aerospace • Artificial Intelligence • Machine Learning • Robotics • Software
Design and implement full‑stack, low‑latency web-based Ground Control Station and C2 systems (map-centric UIs, real-time telemetry, video streaming), lead architecture and APIs, mentor engineers, support field tests and mission deployments, and ensure interoperability with C2 standards.
Top Skills:
A-GraCC++CesiumjsDockerFfmpegGoGstreamerHlsK3DK3SKubernetesLeafletMaplibre GlMavlinkNode.jsOmsOpenapi/SwaggerOpenlayersPostgisPostgresPythonReactRtspSerialization/IdlStanag 4586TcpTypescriptUciUdpWebrtcWebsocket
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