{"id":867727,"url":"https://alion.io/job/perpay-senior-software-engineer-backend","title":"Senior Software Engineer, Backend","company":{"id":687456,"name":"Perpay","domain":"perpay.com","url":"https://alion.io/company/perpay","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"D","score":40,"open_postings":15,"ghost_share":1,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-03T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Philadelphia, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":126000,"max_usd":234000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":2304},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon CloudWatch","optional":false},{"name":"AWS","optional":false},{"name":"Celery","optional":false},{"name":"CI/CD","optional":false},{"name":"Datadog","optional":false},{"name":"Django","optional":false},{"name":"Docker","optional":false},{"name":"Kubernetes","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"Redis","optional":false},{"name":"Flask","optional":true},{"name":"JavaScript","optional":true},{"name":"React Native","optional":true},{"name":"React.js","optional":true},{"name":"Redux","optional":true}],"status":"live","first_seen_at":"2026-04-23T21:25:31Z","employer_posted_date":"2026-04-23","last_verified_at":"2026-10-04T01:08:50Z","board_verified":true,"closed_at":null,"days_open":163,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":162},"description":"About Us:\nPerpay is a certified B Corp and Philadelphia’s most impactful growth-stage startup. We are driven by a mission to significantly improve the financial stability of everyday Americans. For the past decade, we have established strong product-market fit and a profitable, efficient operating model across a suite of products, positioning Perpay as the premier financial partner for consumers with subprime credit.\nWith over 500,000 customers who have utilized more than $1 billion in spending power, we are at a pivotal moment. We are scaling our operations, building new offerings, and deepening our impact. We are looking for teammates eager to join us on this journey.\nOur venture partners include First Round Capital and L Catterton.\nProducts we’ve built to make an impact:\nPerpay Marketplace: Combines interest-free payments and modern e-commerce to reduce cost of ownership and promote healthy repayment behavior.\nPerpay+: Leverages Marketplace repayment history to help members monitor and build credit with all 3 credit bureaus.\nPerpay Credit Card: Expands access to the flexibility and benefits of a World Mastercard by removing common barriers like high security deposits and low approval odds.\nOur team thrives on in-person collaboration, operating from our unique center-city Philadelphia office. This comfortable \"home away from home\" space offers river views and fosters rapid product development, strong relationships, and career growth. The energy from achieving big wins is palpable here. While we primarily work in the office, we offer sensible flexibility for personal needs, such as sick children or urgent errands, and coordinate official remote weeks around major holidays. If you are passionate about a meaningful mission, collaboration, equity, and generous perks, Perpay is the best place to be in Philadelphia right now.\nAbout the Role:\nWe are looking for senior backend engineers passionate about backend technology, excellent user experience and system reliability. The ideal candidate has helped lead the technical design and implementation of backend features on at least one sizable production application within the past year. A senior backend engineer at Perpay will spend their time writing code, reviewing PRs, mentoring engineers, and helping scope & design new features. We are looking for people who can bring backend technical expertise to push our technology forward - whether it’s hosting a lunch-and-learn on a new backend technology or directing a large refactor. We value engineers who demonstrate excitement around solving tough problems and delivering solutions in a fast-paced environment.\nMuch of our team is fullstack, so we look for team members excited to learn new technologies and work across all stacks, even if it’s not something you’ve done before! Our tech stack: Javascript, React, React Native, Redux, Python, Django, Flask, Kubernetes, AWS, Docker and more.\nOur greatest strength is our people and we’d love for you to be one of them!\nResponsibilities:\nDesign and evolve RESTful APIs used by our frontend and internal systems\nOwn data modeling decisions across our relational databases with an eye toward performance and maintainability\nImprove reliability, observability, and operational excellence of our backend systems (metrics, logging, tracing, alerting)\nParticipate in architectural decisions around service boundaries, asynchronous workflows, and distributed system tradeoffs\nDiagnose and resolve production issues across multiple services\nContribute to infrastructure-as-code and CI/CD improvements to increase developer velocity and system stability\nPartner with product and stakeholders to translate complex business rules into maintainable backend systems\nWhat You’ll Bring\n5+ years of experience building web applications at scale in at least one modern language / framework (e.g. Python/Django, Rails, etc.)\n2+ years of experience leading technical teams and large, complex projects\nDeep understanding of relational databases (e.g., Postgres), query optimization, indexing strategies, and schema evolution\nExperience operating production systems in a large cloud provider (e.g. AWS)Familiarity with containerized environments (Docker) and orchestration systems (Kubernetes)\nExperience with background job systems and message queues (e.g. Celery)\nWorking knowledge of caching strategies (e.g. Redis)\nExperience with monitoring/observability tooling (e.g. Datadog, CloudWatch)\nStrong understanding of system reliability, failure modes, and operational tradeoffs\nAbility to communicate complex system behavior clearly to non-technical stakeholders\nA solutions-oriented mindset, willing to step outside your primary domain to unblock teammates and ensure successful delivery\nNYC-level total cash-comp (base $160k into the $200’s, plus equity and a discretionary cash bonus)\nWe know not everybody checks all the boxes, so if you’re interested, please apply because you could be just what we’re looking for!\nWhat We’ll Bring to Full-time Team Members:\nMeaningful compensation and equity\nPremium medical benefits (fully paid base plan, and very reasonable premium for the buy-up option)\n5% employer 401k match\nUnlimited PTO policy\nRemote weeks around major holidays + extra holiday on weekends like MDW and LDW\nHigh quality catered lunch by local chefs, 4 days / week\nGym subsidy\nPaid cell phone + plan\nStudent loan repayment match program\nFamily savings match program\nRelocation assistance\nGenerous team member discounts\nThis is not a remote opportunity; it is 100% onsite (#LI-Onsite) (#LI-TH1) (#LI-AK1)\nPerpay is proud to be an equal opportunity employer. We value diversity in all its forms and are committed to creating an inclusive environment. We do not discriminate on the basis of race, religion, color, national origin, gender identity, sexual orientation, sex (including pregnancy), marital status, political affiliation, age, veteran status, disability status or other non-merit factor. Please contact us at  to request accommodation.","description_format":"text","description_chars":6039,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["401k plan","Equity","Relocation assistance","Unlimited PTO"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Buy Now, Pay Later"],"lifecycle":[{"event":"open","at":"2026-09-13T14:43:56Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 5 · green card filings: 1","filings_12m":5,"filings_prev_12m":3,"green_card_filings_12m":1,"median_offered_wage_usd":127500,"route":null,"cap_exempt":false,"checked_at":"2026-10-03T21:08:04+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":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.227,"p_room":0.28,"age_days":162,"expected_fill_days":42,"reasons":["conf:25","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-03T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/perpay-senior-software-engineer-backend","json_url":"https://alion.io/job/perpay-senior-software-engineer-backend.json","meta":{"generated_at":"2026-10-04T01:25:24Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":1837,"day_limit":5000,"remaining_today":3163,"minute_limit":60,"resets_at":"2026-10-05T00:00:00Z"}}}