Explore 4 backend java developer jobs from 2 hiring companies in Sanford, ME, US. Filter by remote, salary, experience, and company, then open any listing to apply.

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Backend Java Developer

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Backend Java Developer Jobs

DEKA Research & Development

Onsite

Remote

<h3>This is a remote position; however, the candidate must reside within 30 miles of one of the following locations: Portland, ME; Boston, MA; Chicago, IL; Dallas, TX; San Francisco Bay Area, CA; and Seattle/WA.</h3><h3></h3>As a Staff Backend Engineer, you will be the primary architect and execution lead for the transformation of our Digital Credit Application. We are pivoting from a Salesforce-centric monolith to a high-performance, pluggable API ecosystem. Your mission is to decouple core adjudication logic, enable rapid A/B testing of the customer journey, and lay the technical foundation for future AI-driven chat and automated decisioning experiences.This is a high-impact role designed for a &#34;builder&#34; who can manage the duality of supporting a live Salesforce environment while aggressively migrating mission-critical services to a modern, micro services based backbone.Core Responsibilities<ul><li>Architectural Migration: Lead the &#34;Strangler Fig&#34; migration of credit application logic out of Salesforce and into a scalable, cloud-native Java/Spring Boot microservices environment.</li><li>Pluggable Adjudication: Design and implement a modular adjudication layer that allows the business to swap or update credit rules and third-party data providers without impacting the core application flow.</li><li>API-First Ecosystem: Build and maintain robust, versioned REST/gRPC APIs that support a multi-channel experience (Mobile, Web, and future AI Chat interfaces).</li><li>A/B Strategy Enablement: Engineer the backend infrastructure to support dynamic routing and experimentation, allowing Product teams to test various application flows and UI treatments in real-time.</li><li>Operational Excellence &amp; Ownership: Transition the platform by establishing rigorous standards for CI/CD, observability (OpenTelemetry), and automated testing.</li><li>AI Readiness: Partner with Data Science teams to ensure data pipelines and backend schemas are optimized for LLM integration and real-time credit decisioning models.</li><li>Provide technical mentorship and guidance to mid-level and senior engineers, fostering a culture of high engineering standards.</li></ul>Key Qualifications:<h3></h3><ul><li>10&#43; Years of Engineering Excellence: Proven track record in backend architecture, specifically within Fintech, Lending, or Credit systems.</li><li>Salesforce Integration Mastery: Significant experience integrating Salesforce with external AWS/Cloud microservices. You understand how to extract business logic from Apex/Flows into external services.</li><li>Modern Java Stack: Expert-level proficiency in Java 17/21, Spring Boot 3.x, and Spring Cloud.</li><li>Complex Adjudication &amp; Rules Engines: Experience building or implementing rules engines (e.g., Drools, Camunda, or custom JSON-logic) for automated decisioning.</li><li>Event-Driven Design: Deep experience with Kafka or RabbitMQ for maintaining data consistency between the new API layer and legacy systems of record.</li><li>Contract-First Development: Strong belief in API contracts (OpenAPI/Swagger) to ensure seamless collaboration with frontend and mobile teams.</li><li>Migration Strategy: Demonstrated ability to migrate high-volume traffic from legacy systems to new stacks with zero downtime.</li><li>Excellent analytical skills and capability in identifying and resolving complex, cross-functional problems.</li><li>Strong written and verbal communication skills, able to present complex technical concepts clearly.</li><li>Bachelor&#39;s degree in Computer Science or a related field.</li></ul>The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non-sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan. WEX's comprehensive and market competitive benefits are designed to support your personal and professional well-being. Benefits include health, dental and vision insurances, retirement savings plan, paid time off, health savings account, flexible spending accounts, life insurance, disability insurance, tuition reimbursement, and more. For more information, check out the "About Us" section.Pay Range: $140,600.00 - $173,100.00

Software Development Engineer 4

10+ years backend engineering in fintech or lending; Salesforce integration; Java Spring Boot; microservices; API design; CI/CD; observability; AWS.

This is a remote position; however, the candidate must reside within 30 miles of one of the following locations: Boston, MA; San Francisco Bay Area, CA; Dallas, TX; Salt Lake City, UT; Seattle, WA; and Portland, MEAbout the Team/RoleWe are seeking a seasoned Sr. Staff Software Engineer in the WEX Mobility Engineering organization. This role will sit in the Mobility team that caters fleet management and mobility payments solutions to our large customers and partners in the North America region. Mobility development team spans across USA, India, and Brazil. Our Mobility systems provide SaaS, Mobile and API solutions to various customers. WEX Mobility products enable credit issuance to fleet companies and their workers in the form of WEX or cobranded credit cards, usable at fueling stations and select other merchants. At WEX, we provide fleet managers and operators with discounts, and a flexibility to configure spend controls that restrict fleet members to use their cards at configured merchants, for configured amounts and velocity.​How you’ll make an impact:<ul><li>Respect what came before, and yet influence the org with net new ways of solving problems</li><li>Be comfortable in dealing with ambiguity, and help define problems, and then devise solutions for these problems.</li><li>Design, develop, and maintain robust, scalable, and high-performance object oriented code in our backend services.</li><li>Design and implement distributed systems including public REST APIs using Java and internal gRPC APIs for inter-service and inter-system communication.</li><li>Craft systems designs, lead design decisions, and drive alignment with other senior engineers.</li><li>Epitomize writing and generating unit tests, integration tests, end-to-end tests, concurrency tests, load/performance tests. </li><li>Analyze existing systems to identify bottlenecks, tech debt, and implement scalability, and stability improvements.</li><li>Implement automation for testing, monitoring, healing, and scaling applications, continuous integration and deployment to reduce time to market</li><li>Collaborate with cross-functional teams, including product managers and other engineers, to define and implement new features.</li><li>Conduct code reviews (comment, approve, seek revisions, merge), mentor senior engineers, and actively promote engineering best practices.</li><li>Dive deep and troubleshoot complex issues, devise fixes, author root cause analysis documents, and ensure lasting performance and reliability.</li><li>Conduct objective and comparative analyses of competing technologies to advise the team of pros and cons of a technology solution</li><li>Devise mechanisms to create robust documentation (design docs, run books, change management docs, and readiness plans) </li></ul><ul><li>Design tech strategy for live-site support by designing monitoring systems via code, ensuring rapid incident resolution, and driving continuous improvement.</li><li>Drive cross-team projects as a single-threaded-owner (STO) or tech lead, and actively unblock other engineers to make progress.</li></ul>​Experience you&#39;ll bring:<ul><li>Master&#39;s degree in Computer Science or Software Engineering</li><li>10&#43; years of professional experience in software engineering.</li><li>Strong understanding of data structures and algorithms, object-oriented design, and problem-solving skills.</li><li>Expertise in designing and developing internet-scale services with scalability, availability, security, and reliability design tenets.</li><li>Excellent written and verbal communication skills, and a collaborative and empathetic mindset.</li><li>Proficiency in backend development, with proficiency expertise in Java or C#, and frameworks like SpringBoot, building and optimizing RESTful APIs, ODATA framework, and SQL</li></ul>Preferred Qualifications<ul><li>12&#43; years of experience in software engineering. </li><li>Experience with event-driven architecture using AsyncAPI and efficient internal service communication methods</li><li>Expertise in working on card payments (ISO8583) and PCI DSS compliance</li><li>Expertise in APIs’ scalability</li><li>Ability to work on existing codebase, contribute improvements, and adapt to legacy systems’ constraints.</li></ul>The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non-sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan. WEX's comprehensive and market competitive benefits are designed to support your personal and professional well-being. Benefits include health, dental and vision insurances, retirement savings plan, paid time off, health savings account, flexible spending accounts, life insurance, disability insurance, tuition reimbursement, and more. For more information, check out the "About Us" section.

Sr. Staff Software Development Engineer

Senior software engineer with 10+ years experience; MS in CS or Software Engineering; strong Java/C#, SpringBoot; REST APIs; scalable backend; leadership responsibilities.

Please note: This role is open only to candidates located in Chicago, IL; Dallas, TX; New York City, NY; Boston, MA; or Portland, ME.We are currently unable to provide immigration sponsorship or support, either now or in the future.At WEX, we simplify the business of running a business. Our WEX Benefits solutions reduce complexity and help employers manage the cost and administration of employee benefits.We are looking for passionate technologists, collaborators, and problem solvers to join our Benefits Technology team as we build the next generation of employer benefits platforms and services.As a Senior Software Engineer, you will work closely with Product Managers, customers, and engineering peers to understand the challenges employers face in the evolving benefits landscape. You will design and deliver scalable, high-quality solutions using modern engineering practices, including test-driven development and cloud-native architectures.You will have the opportunity to contribute to mission-critical systems, influence technical direction, and help shape engineering standards across the team.<h2>How You’ll Make an Impact</h2><ul><li>Partner with Product and stakeholders to understand customer challenges and translate them into technical solutions</li><li>Design, build, test, and deploy scalable, secure, and high-quality software solutions</li><li>Use data to measure outcomes, validate assumptions, and drive engineering decisions</li><li>Develop and maintain microservices and event-driven architectures</li><li>Strengthen engineering practices including TDD, BDD, and CI/CD automation</li><li>Support production systems through monitoring, incident response, and continuous improvement</li><li>Identify performance bottlenecks and optimize systems for scalability and reliability</li><li>Mentor peers and contribute to a culture of technical excellence and continuous learning</li><li>Take ownership of work, operate independently, and deliver high-quality outcomes with minimal supervision</li></ul><h2>Experience You’ll Bring</h2><h3>Software Engineering &amp; Systems</h3><ul><li>7&#43; years of software engineering experience</li><li>Strong background in backend development, distributed systems, and scalable architecture</li><li>Proficiency in modern backend technologies such as C#, .NET, Java, or Python</li><li>Strong understanding of data structures, algorithms, and object-oriented design</li><li>Experience building and consuming REST APIs</li><li>Hands-on experience with React or modern UI frameworks</li><li>Experience with relational and NoSQL databases (e.g., SQL Server, PostgreSQL, MySQL, MongoDB)</li><li>Strong knowledge of CI/CD pipelines and Git-based workflows</li><li>Experience with cloud-native development in AWS or Azure</li><li>Understanding of software security principles and OWASP guidelines</li><li>Experience writing unit tests and maintaining high test coverage</li><li>Familiarity with Agile development methodologies</li><li>Proven ability to deliver complex projects on time</li></ul><h2>Cloud, DevOps &amp; Infrastructure</h2><ul><li>Experience with cloud services (AWS or Azure), including IAM, compute, storage, and API services</li><li>Familiarity with containerization using Docker and orchestration using Kubernetes</li><li>Exposure to CI/CD tools such as GitHub Actions, GitLab CI, or Jenkins</li><li>Basic understanding of Infrastructure-as-Code (Terraform preferred)</li><li>Familiarity with observability tools (Prometheus, Grafana, CloudWatch, Azure Monitor)</li></ul><h2>AI, Agentic Systems &amp; Emerging Technologies</h2><ul><li>Familiarity with LLM concepts and frameworks such as LangChain, LlamaIndex, LangGraph, or CrewAI</li><li>Exposure to Retrieval-Augmented Generation (RAG) and interest in evolving toward Agentic RAG systems</li><li>Understanding of agentic workflows including tool use (function calling) and state management</li><li>Awareness of vector databases (e.g., Pinecone, Milvus) and semantic search concepts</li><li>Interest in emerging protocols such as Model Context Protocol (MCP)</li><li>Experience or curiosity in building AI-native features and LLM-based automation in CI/CD pipelines</li></ul><h2>Leadership &amp; Collaboration</h2><ul><li>Bachelor’s degree in Computer Science, Software Engineering, or related field</li><li>Strong collaboration skills in agile, cross-functional, and distributed teams</li><li>Ability to communicate technical concepts and trade-offs clearly to both technical and non-technical stakeholders</li><li>Proven ability to work effectively in geographically distributed teams</li><li>Self-driven, proactive, and highly accountable for deliverables</li><li>Continuous learner with strong interest in evolving cloud and AI technologies</li></ul><h2>Technology Must-Haves</h2><ul><li>C# / .NET (or equivalent backend language such as Java or Python)</li><li>React</li><li>REST API development (ASP.NET or equivalent frameworks)</li><li>Docker</li><li>Kubernetes</li><li>SQL &amp; NoSQL databases</li><li>Cloud platforms (AWS / Azure)</li><li>CI/CD pipelines</li><li>Event-driven architecture</li></ul><h2>Nice to Have / Learn Quickly</h2><ul><li>Terraform</li><li>Helm / ArgoCD</li><li>GitHub Actions</li><li>GraphQL</li><li>Kafka</li><li>Azure advanced services</li></ul>The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non-sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan. WEX's comprehensive and market competitive benefits are designed to support your personal and professional well-being. Benefits include health, dental and vision insurances, retirement savings plan, paid time off, health savings account, flexible spending accounts, life insurance, disability insurance, tuition reimbursement, and more. For more information, check out the "About Us" section.Pay Range: $121,500.00 - $145,500.00

Senior Software Engineer (C#/.NET & AI)

Senior Software Engineer

Senior software engineer with 7+ years of backend experience, strong C#/NET/Java/Python, REST APIs, React, databases, CI/CD, cloud (AWS/Azure).

We're looking for a Machine Learning Engineer who can operate at the intersection of backend engineering and applied machine learning. If you want to design distributed systems, deploy production ML models, and architect scalable data pipelines that make a measurable difference &#8212; this is your opportunity, and it starts with the software you design and deliver at DEKA. This role is on-site at DEKA in Manchester, NH. Relocation is not available, local candidates only. How You Will Make an Impact:<ul><li>Design and implement scalable backend services and microservices powering data-intensive, real-world applications</li><li>Build and deploy production ML models across the full lifecycle from feature engineering and training through evaluation, deployment, and monitoring</li><li>Develop and maintain event-driven distributed pipelines using Apache Kafka, Apache Spark, and related technologies</li><li>Architect systems that integrate ML models with rule-based decision engines for automated, real-time decisioning</li><li>Collaborate across disciplines to translate complex requirements into reliable, elegant engineering solutions</li><li>Contribute to AI/LLM-driven workflows and orchestration systems that push the boundaries of what software can do</li></ul>Required Experience/Knowledge:<ul><li>M.S. in Computer Science, AI, or a related field</li><li>6+ years in backend software engineering and distributed systems</li><li>Strong proficiency in Java (Spring Boot, Spring MVC, Hibernate) and Python</li><li>Hands-on experience building and deploying production ML models (PyTorch or equivalent)</li><li>Experience with distributed systems and streaming technologies: Apache Kafka, Apache Spark, ZooKeeper</li><li>Solid understanding of microservices architecture, REST/SOAP APIs, and object-oriented design</li><li>Experience with relational and NoSQL databases (Oracle, IBM Db2, MSSQL, MongoDB)</li><li>Familiarity with AWS or equivalent cloud platforms</li></ul><ul><li>Strong problem-solving skills </li><li>Intrinsic drive to understand how things work and make them better</li><li>Excellent communicating and collaboration across engineering, data, and product teams</li></ul>

Machine Learning Engineer

MS in CS or AI; 6+ years backend and distributed systems; strong Java/Python; production ML models; Kafka/Spark; microservices; databases; AWS.

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