Senior Full Stack Php Developer Jobs in O Fallon, MO

Senior Full Stack JavaScript Developer
Hybrid Role
Compensation: $65 - $85 per hour
ABOUT THE ROLE
Our client, a Fortune 300 pharmaceutical company, is seeking a Senior Full Stack JavaScript Developer to join a high-performing engineering team supporting enterprise-scale applications for one of the world's leading life sciences organizations. This role is ideal for a seasoned software engineer who enjoys building scalable, cloud-native applications while partnering closely with product and engineering teams to solve complex business challenges. You'll play a key role in designing, developing, and enhancing modern applications that directly impact critical business initiatives. The position offers the opportunity to work in a dynamic, innovative environment and collaborate with global teams to deliver high-impact solutions.
WHAT YOU'LL DO

• Design, develop, and maintain full-stack applications using JavaScript, Node.js, React.js, and TypeScript
• Build and enhance scalable REST APIs and cloud-native applications hosted within AWS
• Develop modern, responsive user interfaces utilizing React, HTML5, CSS3, and JavaScript
• Design and optimize PostgreSQL databases to support high-performance applications
• Write clean, maintainable, and well-tested code following engineering best practices and coding standards
• Collaborate with product managers, architects, and global development teams in an Agile environment to deliver innovative software solutions
• Contribute to continuous improvement by identifying opportunities to enhance application performance, scalability, and user experience

WHAT YOU BRING

• Bachelor's or Master's degree in Computer Science or related technical field, or equivalent professional experience
• 10+ years of professional JavaScript development experience
• 10+ years of experience developing applications with Node.js
• 5+ years of experience building front-end applications with React.js
• 4+ years of experience developing cloud-native applications in AWS (e.g., Lambda, S3, SQS, SNS, Kafka, Step Functions)
• 5+ years of experience designing and developing PostgreSQL databases
• Experience with unit testing frameworks such as Jest and React Testing Library
• Strong understanding of Agile software development practices
• Proficiency in building and enhancing scalable REST APIs
• Ability to develop modern, responsive user interfaces using React, HTML5, CSS3, and JavaScript
• Excellent collaboration skills with product managers, architects, and global development teams
• Commitment to writing clean, maintainable, and well-tested code following engineering best practices

WHAT'S IN IT FOR YOU

• 401(k) Matching Plan
• Medical, Dental, & Vision Plans
• Relationship-driven process to find your best fit
• 6 Paid Holidays
• Regular meetings to ensure quality in your engagement
• Employee Assistance Program (EAP) with services like virtual counseling, financial and legal services, and life coaching
• Flexible hiring models including contract, contract-to-hire, and direct placement
• Competitive medical, dental, vision, Health Savings Account, Dependent Care FSA, and supplemental coverage options
• Paid time off, sick time, and paid company holidays

ABOUT US
At Brooksource, relationships are the foundation of everything we do. Since 2000, we've built lasting partnerships with clients, consultants, and internal teams to deliver an exceptional experience across every engagement. As a trusted IT and Engineering services provider, Brooksource supports Fortune 500 organizations through Experience-Driven Staffing, Professional Services, and Elevate, our proprietary Workforce Transformation program. We are a certified partner of leading platforms, including Salesforce, AWS, Microsoft, and Google Cloud, enabling us to deliver scalable, end-to-end technology solutions. With a growing national footprint, Brooksource is redefining expectations in IT consulting, engineering services, and technology workforce solutions.
EEO STATEMENT
Brooksource is an equal opportunity employer that does not discriminate on the basis of actual or perceived race, color, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth, lactation and related medical conditions), gender identity or gender expression, sexual orientation, marital status, military service and veteran status, physical or mental disability, protected medical condition as defined by applicable state or local law, genetic information, or any other characteristic protected by applicable federal, state, or local laws and ordinances.
PAY DISCLAIMER
The pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
Disclaimer: Brooksource, Medasource, and Calculated Hire are part of the Eight Eleven Group family of companies and operate under Eight Eleven Group, LLC. All employees receive the same benefits, policies, and terms of employment.
EEO:
We are committed to creating an inclusive environment for all employees and applicants. We do not discriminate on the basis of race, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, ancestry, age, disability, genetic information, marital status, military or veteran status, citizenship, pregnancy (including childbirth, lactation, and related conditions), or any other protected status in accordance with applicable federal, state, and local laws.
Benefits & Perks:
Brooksource offers competitive medical, dental, vision, Health Savings Account, Dependent Care FSA, and supplemental coverage with plans that can fit each employee's needs. We offer a 401k plan that includes a company match and is fully vested after you become eligible, paid time off, sick time, and paid company holidays. We also offer an Employee Assistance Program (EAP) that provides services like virtual counseling, financial services, legal services, life coaching, etc.
Pay Disclaimer:
The pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.