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$75k
...O’Fallon, IL Job Summary Mid Software Developer – Backend Software Developer to modify existing GOTS code and integrate open‑source solutions... .... Experience with TypeScript, Node.js/Express, ASP.NET Core Web API, Swagger (OpenAPI), C#, and Postgres. Familiarity with REST...SuggestedWork at officeWork from homeHome officeChenega MIOS SBU
O Fallon, MO4 days ago- ...Backend Developer Requirement/Must Have: ~6+ years of experience in backend development using Java. ~ Strong expertise in Core Java, Spring Boot, and REST APIs. ~ Hands-on experience with Kafka / event streaming platforms. ~ Solid understanding of event-driven...Suggested
Cynet Systems
O Fallon, MO1 day ago - ...in enterprise-grade Java applications, design patterns, and performance optimization. # Microservices and REST API Proficiency: Skilled in developing web services, particularly microservices architectures, and REST APIs. This indicates a strong understanding of how...SuggestedFull time
Veracity
O Fallon, MO2 days ago - ...experience with either some lead experience or multiple senior developer roles. ~ Extensive experience as a full-stack Software Engineer... ..., with strong knowledge of microservices architecture, RESTful API design, and integration patterns. ~ Advanced SQL knowledge...SuggestedHourly payH1bWork at officeRelocation3 days per week
Veracity
O Fallon, MO1 day ago $140k - $231k
...the architecture and design of microservices responsible for both API and web authentication authorizations. This role requires deep... ...modular design, and maintainability • Build and enhance internal developer platforms using Backstage or similar frameworks, leveraging...SuggestedFull timePart timeWorldwideFlexible hoursDynamic Yield
O Fallon, MO4 days ago- ...applications, system to system interfaces and complete software solutions. Design and develop test automation scenarios to validate system to system interfaces and complete software solutions (for API and UI tests). Interact with business and development stakeholders to define...Suggested
Samprasoft
O Fallon, MO20 hours ago $92k - $147k
...our customers. We are looking for talented software engineers to develop advanced technologies and applications that are revolutionizing... ...that can code and build high quality secure front end and REST API/backend that is modular, functional, and testable. Contribute...SuggestedWorldwideDynamic Yield
O Fallon, MO4 days ago- ...skills? Data engineer/SDET # Knowledge of Microservices and scaling techniques # Experience using web service APIs # Ability to create good acceptance and integration test automation scripts and integrate with Continuous integration (Jenkins/...Suggested
3B Staffing LLC
O Fallon, MO4 days ago - ...Java Lead Experience Required - 6+ Years Must Have Technical/Functional Skills Object-oriented Programming Web services & API standards (REST/OAuth/JSON) Programming & Scripting Languages (2 or more of Java, C++, Scala, JS, Python, Shell*) Spring,...Suggested
ClifyX
O Fallon, MO20 hours ago - ...Technical solution & application architecture & design Development, review & ownership of architecture & design artifacts (SAD, API Specification etc.) Actively find ways (new technologies, tools, frameworks) to improve software solutions Establish design, architecture...SuggestedLocal area
Zortech Solutions
O Fallon, MO4 days ago - ...Lead Day one ONSITE; O'fallon, MS Sound knowledge of: Java stack (including Spring framework, Spring Batch, etc), React, Rest APIs, SQL (with solid experience working with Oracle) Job Role: Should be capable of responding to customer queries and resolving technical...Suggested
Futran Tech Solutions Pvt. Ltd.
O Fallon, MO4 days ago $87.1k - $157.45k
...an Intelligence Community customer. In this role, you’ll design, develop, and deliver modern software solutions that enable critical... ...functional development teams to build and maintain microservices, APIs, and web-based applications that support GEOINT data access, visualization...SuggestedContract workLocal areaImmediate startLeidos
Ballwin, MO4 days ago$140k - $231k
...business priorities. Key Responsibilities Lead, coach, and develop a high-performing engineering team, fostering a culture of... ...Provide technical leadership in architecture (microservices, APIs, scalable design) and system design decisions Oversee execution...SuggestedDynamic Yield
O Fallon, MO4 days ago$212k - $339k
...SLAs, observability, and incident management. • Build, lead, and develop a high-performing organization of engineering managers and... ...• Deep expertise in modern application architectures, including APIs, microservices, event-driven systems, batch processing, and data...SuggestedFull timePart timeWorldwideFlexible hours3 days per weekMasterCard
O Fallon, MO2 days ago$63 - $90 per hour
...Partners is currently seeking a talented Senior .NET Full-Stack Developer. Do you have experience building large-scale distributed... ...with Entity Framework, Dependency Injection, and cloud-hosted APIs. Experience with AWS services: Lambda, S3, SQS, SNS, Kafka, Step...SuggestedTechnology Partners
Wildwood, MO1 day ago$152k - $258k
...as Code solutions using platforms like Terraform, Ansible, Chef to automate provisioning across cloud and on prem environments. • Develop reusable modules, playbooks, and automation libraries that standardize infrastructure deployment patterns. • Engineer and enhance...Full timePart timeWorldwideFlexible hoursMasterCard
O Fallon, MO1 day ago$140k - $231k
...software engineering experience. - 3+ years leading large-scale distributed system initiatives. - Expert-level Java, Spring Boot, REST APIs, microservices architecture, and distributed systems expertise. - Strong software architecture and software design leadership...Full timePart timeWorldwideFlexible hours- ...reliability, and performance to deliver solutions that delight our customers. We're looking for talented software development engineers to develop advanced technologies and applications that are revolutionizing payments. Are you passionate about software engineering? Do...Work experience placementFlexible hours
Samprasoft
O Fallon, MO20 hours ago $115k - $184k
.... Role As a Senior Software Engineer, you will: • Design, develop, and maintain scalable test frameworks and automation solutions... ...improvement All About You • Experience building applications and REST APIs using Java, Spring Boot, and Spring Data JPA • Strong...Full timePart timeWorldwideFlexible hours- ...Insight Global is looking to add a Full Stack Java Developer to our client's team in the St. Louis, MO area. This person will be supporting... ...'s Ordering Integration Services (OIS) which is the set of APIs that facilitate a client to retrieve backend data as well submit...Remote work
Insight Global
Maryland Heights, MO3 days ago $305k
...and development of mission-critical systems, and champion modern engineering practices, including cloud-native design, microservices, APIs, DevOps, and CI/CD. You will build and mentor high-performing teams, foster a culture of innovation and inclusion, and collaborate...Mastercard
O Fallon, MOmore than 2 months ago- ...AI Engineer We are seeking a talented and motivated AI Developer to design, build, and deploy AI-driven solutions that enhance marketing... ...and analysis (SQL, Pandas, etc) ~ Understanding of APIs and system integration ~ Strong problem solving and analytical...
APC Integrated
O Fallon, MO2 days ago - ...development # Strong background in test automation with a focus on APIs. # Experience with JUnit and/or TestNG and Selenium... ...Space. As part of an exciting, fast paced environment developing payment solutions in the mobile and e-commerce space, this position...Work experience placement
3B Staffing LLC
O Fallon, MO4 days ago - Azure Platform Engineer Location: O'Fallon, MO Duration: Long Term Contract Number of opening: 1 Project Scope: System Integration, CI/CD Pipeline Development, User Provisioning, LDAP Integration, System Resiliency Testing, Security practices Role & Responsibilities...Long term contract
Keylent Inc
O Fallon, MO4 days ago - ...to meet the needs of those we serve. Job Summary The Full Stack Developer serves as the primary developer supporting Moneta Central, the... ...including React and React Native frontends, Node.js backends, RESTful APIs, and PostgreSQL databases—with TypeScript used throughout. The...Temporary workWork at officeShift work
Moneta Corporation
Clayton, MO1 day ago - Mastercard Python Contractor Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using secure...For contractorsH1bWork at officeLocal area
Samprasoft
O Fallon, MO20 hours ago - ...C++ Developer – Replacement Location: OFALLON, MO – DAY 1 Onsite (hybrid) Duration: Long Term Number of openings: 1 Roles and Responsibilities: Need someone who can analyze C/C++ code and find performance bottlenecks. Proficient in C/C++ Proficient...
Zortech Solutions
O Fallon, MO4 days ago - Global Credit Card Authorization Team Opportunity This is an exciting opportunity for you to join the global credit card authorization team. The system facilitates billions of transactions among issuers, acquirers, and service providers. We are looking for engineers...
Samprasoft
O Fallon, MO20 hours ago $115k - $184k
...Remote Payment and Presentment System) platform team. This team develops and supports critical software solutions that enable payment processing... ...who enjoys building modern applications, designing scalable APIs, solving complex technical problems, and contributing to high-...Full timePart timeRemote workWorldwideFlexible hours$115k - $184k
...is a senior individual contributor responsible for designing, developing, and supporting highly scalable distributed systems. This role... ...Strong hands-on experience with Java, Spring Boot, Kafka, REST APIs, JPA, and distributed systems. •Strong understanding of software...Full timePart timeWorldwideFlexible hours
