{"id":586783,"url":"https://alion.io/job/tillster-dev-senior-software-engineer-back-end-6","title":"Senior Software Engineer – Back End","company":{"id":334099,"name":"Tillster","domain":"tillster.com","url":"https://alion.io/company/tillster","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":95,"open_postings":13,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":145,"computed_at":"2026-10-28T05:59:10Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Los Angeles, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":150000,"max":175000,"currency":"USD","period":"year","gross":null,"usd_annual":175000},"salary_estimate":null,"experience_years_min":6,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Java","optional":false},{"name":"Maven","optional":false},{"name":"PCI DSS","optional":false},{"name":"Rest API","optional":false},{"name":"SOAP","optional":false},{"name":"PassKit","optional":true}],"status":"live","first_seen_at":"2026-07-03T00:14:53Z","employer_posted_date":"2026-07-03","last_verified_at":"2026-10-28T16:27:37Z","board_verified":true,"closed_at":null,"days_open":117,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":117},"description":"Role: Senior Software Engineer - Back End\nHybrid Role, MUST BE BASED IN SAN DIEGO, CA\nAbout Tillster\nTillster, headquartered in the USA, is the global leader in digital ordering and customer engagement solutions. For over a decade we have developed revolutionary self-service, ordering and payments solutions - for mobile, tablet, online, kiosk, call center, and more - creating personalized interactions based on consumer preferences, language, and currency. Our platform is compatible with 15+ unique POS systems, representing over 90% coverage in multi-unit restaurants. We offer one platform; one scalable, enterprise class solution - to create world-class digital engagement solutions.\nOur mission and passion are one in the same: Empower restaurants and consumers to engage and transact anywhere, anytime, and from any device - one consumer at a time, one order at a time, billions of times over. In doing so, together we are transforming e-commerce in restaurants and make the till grow for Tillster and our customers.\nAbout the Role\nWe are looking for a Senior Engineer (bordering on Architect) to own and evolve the payment-terminal platform behind our kiosks: a layer of 40+ integrations spanning card-present terminals, semi-integrated and cloud processors, and cash automation. You will re-architect this into a modular, pluggable SDK so internal teams and external/third-party developers can build new integrations against a stable, versioned contract without forking the core, and you will stay hands-on, implementing new integrations down to the wire-level protocol.\nWhat You'll Do (architecture and ownership)\nOwn the payments domain end to end on the kiosk platform: authorize, capture, void, refund, reversal, settlement (EOD), and reconciliation.\n\nRe-architect the platform into a pluggable payment SDK: design the plugin contract and lifecycle (discovery/registration, versioning and backward compatibility, capability negotiation, dependency isolation, per-integration configuration and secrets) on top of the existing PayTerminal SPI.\n\nDesign a terminal abstraction that cleanly spans integrated vs. semi-integrated vs. cloud/REST processors and cash devices, so callers code to one model regardless of transport or vendor.\n\nBuild the integration test and certification harness (extending the current mock-terminal approach) so a new or external integration can be validated, simulated, and regression-tested before it touches real hardware.\n\nSet platform-wide patterns for correctness in money movement: idempotency, transaction recovery and reversal, timeouts, heartbeat/health, concurrency, and reconciliation, in a system where double-charges and dropped captures are unacceptable.\n\nDesign for PCI-DSS scope minimization: tokenization, P2PE, per-processor TLS/mTLS and certificate/key handling, so cardholder data stays out of in-scope services. Partner with security/QSA on audits.\n\nDrive architecture and design reviews, set technical direction for the integration layer, and mentor engineers building integrations.\n\nWhat You'll Do (hands-on, low to high level)\nImplement new terminal integrations end to end, from byte-level protocol (framing, TLV/BMP/APDU, BCD/LLVAR, checksums, ACK/NAK state machines) up to the high-level PayTerminal API.\n\nWork directly with serial (RS-232 / USB-serial via jssc) and USB (usb4java) transports: port handling, event-driven reads, reconnection, and timing.\n\nIntegrate high-level and cloud processor APIs (REST/SOAP, webhooks, semi-integrated terminal SDKs) with robust retry, polling, and reconciliation.\n\nDebug live hardware: protocol traces, terminal logs, packet captures, and vendor certification cycles.\n\nAbout You (required)\n6+ years back-end engineering with strong Java (the platform is multi-module Maven/Java on Spring) and solid OOP and distributed-systems design.\n\nDemonstrated experience designing extensible / plugin / SPI-based architectures (ServiceLoader, OSGi, Spring plugin models, or public SDKs consumed by other teams or third parties).\n\nHands-on low-level device and protocol experience: serial and/or USB communication and binary protocol implementation (TLV, BCD, bitmaps, length-prefixed fields, state machines). EMV, ISO 8583, ZVT, or OPI a strong plus.\n\nDirect payment-terminal / POS integration experience (Verifone, Ingenico, Adyen, Shift4, FreedomPay, SIX, Nepting, SiTef, Redsys, Worldpay, or comparable), and a clear understanding of integrated vs. semi-integrated models.\n\nSolid grasp of the card transaction lifecycle (auth, capture, void, refund, settlement, reversal) and PCI-DSS boundaries, tokenization, and TLS/mTLS in production.\n\nTrack record of technical leadership: leading designs, setting standards, and mentoring engineers.\n\nNice-to-haves\nCash automation and recyclers (Vynamic Cash or similar), end-of-day and reconciliation tooling.\n\nRegional acquiring experience (LatAm, EU, Middle East) and multi-currency payments.\n\nLoyalty, stored-value, gift, or wallet (Apple Pay / Google Pay) integration.\n\nVendor certification experience with acquirers and processors; 3-D Secure / SCA, fraud/risk tooling.\n\nThriving at Tillster\nAs a member of Tillster, you will embody our core values:\n· Put Customers First: Prioritize the needs and satisfaction of our customers in all decisions and actions appropriate to Tillster’s stage of development, resources, and stated goals.\n· Collaborate:Work together effectively, leveraging diverse perspectives to achieve common goals.\n· Innovate:Embrace creativity and pursue new ideas to drive progress and improvement.\n· Operate from Data:Use strong critical thinking skills to make informed decisions based on accurate and relevant data.\n· Drive Results:Focus on achieving tangible outcomes and delivering high performance.\n· Own It:Take responsibility for your actions and the success of your work.\n· Be Passionate and Have Fun:Bring enthusiasm to your work and enjoy the journey.\nThe Interview Process\nRecruiter interview with a Talent Acquisition Specialist\n\nInterview with Hiring Manager\n\nTechnical Assessment\n\nInterview with our Kiosk-Payment Team\n\nFinal Interview-Head of Kiosk\n\nPay and Benefits (USA)\nSalary is $150,000 - $175,000 DOE\n\nHealth Benefits: All full-time, regular employees and their dependents are eligible for medical, dental, vision and FSA benefits. Additional health benefits include Healthcare and Dependent Care reimbursement programs, Employee Assistance Program (“EAP”) and Optum Care 24-hour confidential medical counseling services.\n\nHolidays: The company observes ten (10) paid holidays per calendar year.\n\nPaid Time Off (PTO): Full-time, regular employees earn 15 days of PTO in the first 12-months of continuous service, and 22 days in subsequent years. Eligible part-time employees earn pro-rated PTO.\n\nRetirement: Effective with your employment start date, you will be eligible to participate in the 401(k) Plan.\n\nEducation, Learning & Development: We offer college tuition and education assistance programs; Udemy Learning courses; and ongoing learning and development opportunities.\n\nLocal Candidates Only\nNo Visa Sponsorship\nPrincipals only - no Agencies or calls please","description_format":"text","description_chars":7149,"description_truncated":false,"requirements":{"experience_years_min":6,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Education assistance"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["POS Systems","Scheduling & Booking Software"],"lifecycle":[{"event":"open","at":"2026-09-10T05:37:31Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 3","filings_12m":3,"filings_prev_12m":2,"green_card_filings_12m":0,"median_offered_wage_usd":182500,"route":null,"cap_exempt":false,"checked_at":"2026-10-15T11:24:14+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)","US Department of Labor: PERM disclosure data (green cards)"],"filings_for_role_12m":2}],"liveness":{"score":50,"band":"ok","label":"Likely open","p_open":1,"p_active":0.84,"p_room":0.6,"age_days":117,"expected_fill_days":145,"reasons":["conf:3","velocity","win:late","crowd:"],"computed_at":"2026-10-28T05:59:10Z"},"pay":{"stated_usd_annual":175000,"is_top_pay":false},"html_url":"https://alion.io/job/tillster-dev-senior-software-engineer-back-end-6","json_url":"https://alion.io/job/tillster-dev-senior-software-engineer-back-end-6.json","meta":{"generated_at":"2026-10-28T17:39:19Z","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 call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":24068,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":334099},"rest":"https://alion.io/mcp/rest/get_company?id=334099"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftillster-dev-senior-software-engineer-back-end-6"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Ftillster-dev-senior-software-engineer-back-end-6"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Ftillster-dev-senior-software-engineer-back-end-6"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/tillster-dev-senior-software-engineer-back-end-6\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftillster-dev-senior-software-engineer-back-end-6"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":586783}},{"tool":"search_jobs","arguments":{"company":"tillster.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":586783},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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