{"id":1940081,"url":"https://alion.io/job/wex-senior-back-end-engineer","title":"Senior Back End Engineer","company":{"id":2019,"name":"WEX","domain":"wexinc.com","url":"https://alion.io/company/wex","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bengaluru, India"],"countries":["IN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":14000,"max_usd":33000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":132},"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Go","optional":false},{"name":"gRPC","optional":false},{"name":"Java","optional":false},{"name":"MongoDB","optional":false},{"name":"Rest API","optional":false},{"name":"SQL","optional":false},{"name":"Apache Kafka","optional":true},{"name":"Docker","optional":true},{"name":"Kubernetes","optional":true},{"name":"PCI DSS","optional":true}],"status":"live","first_seen_at":"2026-09-01T00:00:00Z","employer_posted_date":"2026-09-01","last_verified_at":"2026-10-10T23:46:26Z","board_verified":true,"closed_at":null,"days_open":40,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":40},"description":"About the Team/Role\n We are seeking a Senior Engineer in the WEX Mobility Engineering organization. This role will sit in the NAM Experiences team that supports the fleet management and mobility payments solutions to our large customers and partners in North America. Our Mobility systems provide SaaS 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 the flexibility to configure spend controls that restrict fleet members to use their cards at configured merchants, for configured amounts and velocity etc.\nHow you’ll make an impact:\nDesign, develop, and maintain robust, scalable, and high-performance code in our backend services.\n\nDevelop public REST APIs using Java and internal gRPC APIs for inter-service and inter-system communication.\n\nCraft systems designs, lead design decisions, and drive alignment with other senior engineers.\n\nWrite automated unit tests, integration tests, end-to-end tests, concurrency tests, load/performance tests.\n\nAnalyze existing systems to identify bottlenecks, tech debt, and implement scalability and stability improvements.\n\nImplement automation for testing, monitoring, healing, and scaling applications, continuous integration and deployment to reduce time to market\n\nCollaborate with cross-functional teams, including product managers, designers, and other engineers, to define and implement new features.\n\nConduct code reviews (comment, approve, seek revisions, merge), mentor junior and mid-level engineers, and actively promote engineering best practices.\n\nDive deep and troubleshoot complex issues, devise fixes, author root cause analysis documents, and ensure lasting performance and reliability.\n\nSupport the objective and comparative analyses of competing technologies to advise the team of pros and cons of a technology solution\n\nMaintain robust documentation (design docs, run books, change management docs, and readiness plans)\n\nProvide live-site support for production applications by monitoring systems, ensuring rapid incident resolution, and driving continuous improvement.\n\nExperience you'll bring:\nBachelor’s degree in Computer Science or Software Engineering\n\n5-8 years of professional experience in software engineering.\n\nStrong understanding of data structures and algorithms, object-oriented design, and problem-solving skills.\n\nExpertise in designing and developing internet-scale services with scalability, availability, security, and reliability design tenets.\n\nProfessional written and verbal communication skills, and a collaborative and empathetic mindset.\n\nPrior mentorship of junior engineers.\n\nExperience with AWS as the foundational cloud infrastructure, encompassing proficiency in its core services, deployment methodologies, observability and monitoring.\n\nProficiency in backend development, with proficiency expertise in Java, Go or C#, and associated frameworks like SpringBoot, building and optimizing RESTful APIs, ODATA framework, and SQL/Mongo\n\nPreferred Qualifications\nMaster’s degree in computer science or software engineering.\n\n8+ years of experience in software engineering.\n\nExperience with event-driven architecture and tools like Kafka.\n\nExperience working on payment solutions.\n\nFamiliarity with cloud-native architecture (containerization using tools such as Docker and Kubernetes).\n\nExtensive API security and PCI DSS compliance exposure.\n\nAbility to work on existing codebase, contribute improvements, and transition legacy systems to modern technologies.","description_format":"text","description_chars":3678,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Fleet Management","Cards & Card Issuing","Payment Processing & Gateways"],"lifecycle":[{"event":"open","at":"2026-10-06T02:14:24Z"}],"visa":[],"liveness":{"score":38,"band":"fade","label":"Fading","p_open":1,"p_active":0.69,"p_room":0.55,"age_days":39,"expected_fill_days":29,"reasons":["conf:1","velocity","win:tail","comp:brand"],"computed_at":"2026-10-10T05:45:15Z"},"pay":null,"html_url":"https://alion.io/job/wex-senior-back-end-engineer","json_url":"https://alion.io/job/wex-senior-back-end-engineer.json","meta":{"generated_at":"2026-10-11T03:37:46Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per 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