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Api Developer Jobs in Delaware (NOW HIRING)

Nityo Infotech

.Net developer with Loan IQ

Wilmington, DE · On-site

$100K - $135K/yr

... API oModularized design for reusable common services oClear separation of client-specific logic ... engineers, ensuring adherence to standards and architecture. · Collaborate and provide clear ...

New

Apton inc

Senior Java Microservices developer

Wilmington, DE · On-site

$55.50 - $70.75/hr

Java, J2ee, spring, spring boot, Microservices, API Qualifications Need strong consultant with microservices and spring boot apis Additional Information All your information will be kept confidential ...

Apton Inc

Senior Java Microservices developer

Wilmington, DE · On-site

$55.50 - $70.75/hr

Java, J2ee, spring, spring boot, Microservices, API Qualifications Need strong consultant with microservices and spring boot apis Additional Information All your information will be kept confidential ...

Saransh Inc

SDET - Java Coding

Wilmington, DE · On-site

Selenium, Automation, Java Coding exp is must, API Automation, Mainframe Testing, TOSCA * Design, develop, and maintain scalable test automation frameworks and Automation background is must, get SDET ...

BC Forward

Senior Full Stack Java Developer

Newark, DE · On-site

$65.05/hr

Senior Full Stack Java Developer Location: Newark, DE Duration: Contract - 8 months Pay Range: $65 ... App Prog IV & V (Java, Java Spring, REST API/SOAP/Spring Boot). Please omit photos, images of ...

Nastech Global

Solution Architect

Wilmington, DE · On-site

$61.25 - $80.50/hr

... reverse engineering, BDD, Gherkin Desired Skills: Architecture Design & Strategy Scrum Agile ... REST API & SOAP - API design, integration, and security.

Photon

Tech Lead (Fullstack - React & Nodejs)

Newark, DE · On-site

$57.25 - $73/hr

Run day-to-day delivery of the offshore senior developer team: sprint commitments, code review, real-time unblocking, and hands-on work on critical or time-sensitive pieces. Report delivery status ...

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How much do api developer jobs pay per hour?

As of Jul 14, 2026, the average hourly pay for api developer in Delaware is $59.94, according to ZipRecruiter salary data. Most workers in this role earn between $54.62 and $67.36 per hour, depending on experience, location, and employer.

Will AI replace APIs?

As an API developer, AI is more likely to augment API development by automating tasks like testing, documentation, and integration rather than replacing APIs themselves. APIs serve as essential interfaces for software communication, and AI tools can enhance their creation and maintenance but do not eliminate the need for APIs. Skills in API design, security, and AI integration remain valuable in this evolving environment.

What does an API developer do?

An API developer designs, builds, tests, and maintains application programming interfaces (APIs) that enable different software systems to communicate. They work with programming languages like Java, Python, or JavaScript and often use tools such as REST or SOAP to create reliable and secure data exchanges. Their role involves understanding system requirements, writing clean code, and ensuring APIs are scalable and well-documented.

How much does an API developer make?

An API developer's salary varies based on experience, location, and skills, but typically ranges from $70,000 to $130,000 annually. Senior developers with expertise in RESTful APIs, security, and cloud platforms can earn higher salaries, especially in competitive markets.

What does a typical workday look like for an API Developer?

A typical workday for an API Developer involves designing, coding, and testing APIs to ensure they meet business requirements and function optimally. You’ll frequently troubleshoot integration issues, review code for security and performance, and collaborate closely with front-end, back-end, and product teams to address evolving project needs. Daily tasks may include updating API documentation, participating in agile sprint meetings, and responding to technical support queries from other developers or partners. The work environment is often dynamic and collaborative, with a strong emphasis on continuous learning and adapting to new technologies.

Are API developers in demand?

API developers are in high demand due to the increasing reliance on web services and integrations across industries. Skills in REST, SOAP, and API management tools are particularly valuable, and the role often requires knowledge of programming languages like Python, Java, or JavaScript. The demand is expected to grow as digital transformation accelerates businesses' need for efficient data exchange and automation.

What does an API Developer do?

An API Developer is responsible for designing, building, and maintaining application programming interfaces (APIs) that enable software applications to communicate with each other. They ensure APIs are secure, scalable, and efficient, often working with technologies like REST, GraphQL, and SOAP. API Developers collaborate with front-end and back-end teams to integrate systems and improve functionality. Their role also involves debugging, optimizing performance, and documenting API usage.

What are the key skills and qualifications needed to thrive in the Api Developer position, and why are they important?

To thrive as an API Developer, you need strong programming skills in languages like JavaScript, Python, or Java, as well as a solid understanding of RESTful and SOAP API protocols. Proficiency with tools such as Postman, Swagger, and familiarity with API security, cloud platforms, and relevant certifications (like AWS Certified Developer) are commonly required. Excellent problem-solving abilities, attention to detail, and clear communication skills help you collaborate effectively and navigate complex development challenges. These capabilities are crucial for building reliable, scalable APIs that enable seamless integration between diverse systems and deliver value to users and teams.

What are the most commonly searched types of Api Developer jobs in Delaware? The most popular types of Api Developer jobs in Delaware are:
What are popular job titles related to Api Developer jobs in Delaware? For Api Developer jobs in Delaware, the most frequently searched job titles are:
What job categories do people searching Api Developer jobs in Delaware look for? The top searched job categories for Api Developer jobs in Delaware are:
What cities in Delaware are hiring for Api Developer jobs? Cities in Delaware with the most Api Developer job openings:
What are popular job titles related to Api Developer jobs in DE? For Api Developer jobs in DE, the most frequently searched job titles are:
Api Developer jobs near you
Infographic showing various Api Developer job openings in Delaware as of July 2026, with employment types broken down into 50% Full Time, and 50% Contract. Highlights an 100% In-person job distribution, with an average salary of $124,674 per year, or $59.9 per hour.
Lead .Net Platform Engineer (Payments Ingestion) - Senior Vice President

Lead .Net Platform Engineer (Payments Ingestion) - Senior Vice President

Citigroup, Inc.

New Castle, DE • On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 2 days ago

Job description

About the Role
We are seeking an experienced, hands-on Senior .Net Lead to contribute to the development of our engineering frameworks, with a strong focus on microservice architecture. This senior engineering leadership role merges hands-on technical contribution with organizational accountability. The ideal candidate will remain deeply involved in the code and architecture while simultaneously owning the platform strategy, defining engineering standards, and guiding a scrum team in developing core functionalities within the payments lifecycle.
Key Responsibilities
1. Hands-On Technical Contribution & System Design
  • Actively code in .Net developing reusable frameworks while performing system design, architecture reviews, and code reviews for the core cheque payment platform.
  • Contribute to the design of distributed, fault-tolerant, real-time systems for high-volume, low-latency transaction processing.
  • Write, review, and refactor production-grade code in .Net setting a high technical standard for the team.
  • Independently design event-driven, microservices-based architectures utilizing REST APIs, .Net. React knowledge is a plus.
  • Apply hands-on experience with Kafka, including message schema design, topic partitioning, consumer group strategies, and fault-tolerant processing.
  • Design and govern data architecture across Oracle (SQL) and MongoDB (NoSQL), covering schema design, indexing strategies, query optimization, and data consistency patterns.
  • Champion continuous development, feature flags, and progressive delivery, contributing to the design and optimization of CI/CD pipelines.
  • Produce and review Architecture Decision Records (ADRs) and technical design documents for key platform components.

2. Engineering Excellence & Quality
  • Maintain and enforce engineering standards within the scrum team, including Test-Driven Development (TDD), reusable framework development, CI/CD, secure coding, and observability.
  • Conduct code reviews for critical platform components, providing detailed technical feedback to enhance team quality and capacity, ensuring the development of scalable and reusable services.
  • Drive the adoption of AI-powered quality practices, including leveraging tools like GitHub Copilot for coding, utilizing LLMs (Gemini experience preferred) to improve payment processing quality, and implementing automated test script generation and vulnerability remediation.
  • Lead performance engineering initiatives, including profiling JVM-based applications identifying performance hotspots, and optimizing critical settlement processing paths.
  • Own the security and compliance posture of the cheque payment platform by participating in threat modeling, vulnerability assessments, and secure design reviews.
  • Ensure all engineering delivery aligns with Citi Engineering Excellence Standards, including CI/CD, DevOps, cloud-native practices, and modern ways of working.

3. Platform Strategy & Domain Ownership
  • Define and own the engineering roadmap for modernizing the cheque payment platform, migrating global components from monolithic mainframe and legacy applications to a reusable microservices architecture.
  • Develop strong domain knowledge in the payment lifecycle, settlement, and cheque image processing to inform sound engineering decisions.
  • Own the platform's SLA commitments, driving architectural decisions to meet availability, throughput, and latency targets.
  • Develop cross-platform integration by governing API contracts, data flows, and system dependencies across the Payments, Settlements, DDA, and Data Lake ecosystems.
  • Drive capacity planning and investment prioritization, making informed decisions on platform scaling, technology refresh, and resource allocation.
  • Partner with Operations, Risk, Compliance, and Business teams to ensure the platform meets all regulatory requirements and business needs.

4. Leadership & Stakeholder Engagement
  • Act as the primary engineering point of contact for the core Cheque Processing pillar, engaging with senior business, technology, and operations stakeholders.
  • Clearly communicate platform health, delivery progress, engineering strategy, and risks to senior leadership.
  • Partner with Product, Operations, Risk, Finance, and Compliance teams to align engineering priorities with business and regulatory needs.
  • Demonstrate the ability to pivot direction to meet timelines and delivery commitments with tactical solutions, while maintaining a clear vision for strategic platform development.

Skills and Qualifications
1. Core Programming & System Architecture
  • .Net: 10+ Extensive hands-on experience in high-throughput, production-grade .Net engineering, including JVM performance tuning.
  • API Development: Hands-on experience building RESTful APIs with frameworks such as Spring MVC or Spring Boot.
  • Microservices Architecture: Proven experience designing microservices ecosystems, including service decomposition, API design, inter-service communication, and cloud engineering.
  • Event-Driven & Messaging Systems: Deep, hands-on expertise in Kafka, including topic design, partitioning, consumer groups, exactly-once semantics, and high-throughput stream processing.
  • High-Performance Computing: Hands-on experience with profiling and optimization, including JVM tuning, garbage collection (GC) optimization, thread management, and memory profiling.
  • High Availability & Fault Tolerance: Practical experience designing resilience patterns such as circuit breakers, bulkheads, failover, and disaster recovery.
  • Databases: Hands-on expertise in Oracle (SQL) and Microsoft SQL for schema design, query optimization, and indexing, as well as MongoDB (NoSQL) for document modeling, aggregation pipelines, sharding, and replica sets.

2. Cloud & DevOps
  • Cloud-Native Engineering: Hands-on experience with OpenShift/AWS, Kubernetes, and Docker for container orchestration, autoscaling, and cloud-native deployment.
  • CI/CD & DevOps: Experience designing and owning CI/CD pipelines aligned with enterprise-level Engineering Excellence Standards. Experience with tools like Jenkins and Gradle/Maven.
  • Observability: Hands-on experience with distributed tracing, intelligent alerting, and AI-driven observability using tools like Grafana.
  • Secure Engineering: Practical experience with threat modeling, vulnerability assessments, and secure design reviews.
  • Agile at Scale: Experience with Agile/SAFe delivery at the program level, including PI planning, cross-team dependency management, and delivery governance.

Good-to-Have Skills
  • ML Integration: Hands-on experience with real-time ML model serving, including feature stores, online inference, and model monitoring.
  • AI Frameworks: Familiarity with Retrieval-Augmented Generation (RAG) patterns, vector databases (e.g., Pinecone, Weaviate), or agentic AI frameworks (e.g., LangChain, AutoGen).
  • MLOps: Knowledge of MLOps practices such as model versioning, deployment pipelines, and production model monitoring.
  • Resilience Testing: Experience with chaos engineering and resilience testing, including fault injection and production readiness reviews.
  • Financial Systems: Knowledge of reconciliation and exception handling patterns in settlement workflows.
  • LLM Experience: Familiarity with prompt engineering and LLM fine-tuning in a regulated enterprise context.
  • Python: Hands-on expertise in Python for data pipelines, AI/ML integration, scripting, and automation.
  • Legacy Modernization: Experience with large-scale transformation projects, including migrating mainframe components (COBOL, Assembler) and legacy systems (C++, .NET) to a microservices architecture.
  • Strategy: Experience with technology investment governance and engineering budget management.

What We Are Looking For
  • A hands-on leader who actively contributes to code, frameworks, reviews, and technical problem-solving.
  • A strategic thinker who is equally comfortable at the code/architecture level and the platform strategy/stakeholder management level.
  • A pragmatic innovator who identifies practical, high-value opportunities to apply AI/ML without losing focus on engineering fundamentals.
  • An accountable owner with a strong sense of ownership for platform quality, reliability, and delivery.
  • A mentor committed to developing engineers and managers, building technical capability and leadership depth across the team.
  • An effective communicator able to translate technical complexity into clear, concise updates for business and senior leadership.

Why Join Us
  • Lead engineering for a central global payment platform while remaining deeply technical.
  • Drive AI and engineering transformation on a high-visibility modernization initiative with significant business impact.
  • Work at the intersection of high-throughput financial systems and modern AI capabilities.
  • Build and mentor a strong engineering team with access to state-of-the-art tools, platforms, and talent.
  • Be part of an engineering culture that values technical depth at every level of seniority.

Education:
  • Bachelor's degree/University degree or equivalent experience
  • Master's degree preferred

Job Family Group:
Technology
Job Family:
Applications Development
Time Type:
Full time
Primary Location:
New Castle Delaware United States
Primary Location Full Time Salary Range:
$156,160.00 - $234,240.00
In addition to salary, Citi's offerings may also include, for eligible employees, discretionary and formulaic incentive and retention awards. Citi offers competitive employee benefits, including: medical, dental & vision coverage; 401(k); life, accident, and disability insurance; and wellness programs. Citi also offers paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays. For additional information regarding Citi employee benefits, please visit citibenefits.com. Available offerings may vary by jurisdiction, job level, and date of hire.
Most Relevant Skills
Please see the requirements listed above.
Other Relevant Skills
For complementary skills, please see above and/or contact the recruiter.
Anticipated Posting Close Date:
Jun 22, 2026
Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.
If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.
View Citi's EEO Policy Statement and the Know Your Rights poster.

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