{"id":3748180,"url":"https://alion.io/job/solflare-backend-developer-5","title":"Backend Developer","company":{"id":2416,"name":"Solflare","domain":"solflare.com","url":"https://alion.io/company/solflare","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"middle","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Novi Sad, Serbia"],"countries":["RS"],"hiring_countries":["HR","RS"],"hiring_countries_total":2,"salary":null,"salary_estimate":null,"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"DigitalOcean","optional":false},{"name":"Express","optional":false},{"name":"GCP","optional":false},{"name":"Jest","optional":false},{"name":"Node JS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Redis","optional":false},{"name":"Solana","optional":false},{"name":"JavaScript","optional":true},{"name":"Machine Learning","optional":true}],"status":"live","first_seen_at":"2026-11-04T10:26:38Z","employer_posted_date":"2026-11-04","last_verified_at":"2026-11-05T00:06:16Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"About us\nSolflare is a Solana self-custody wallet that puts people in control of their digital assets. Around 4 million users control $20 billion in funds through our wallet.\nWhat started as a team of 6 in 2020 building Solana's first wallet, has grown into a team of 150 worldwide. We’re remote-first, but if you happen to stop by in Zagreb, Croatia, or Belgrade or Novi Sad, Serbia, we have an office you can work from if that’s what you prefer.\nWherever we work, we share the same goal: a Web3 wallet for everyone, with financial freedom in their hands.\nThe role\nAs a Backend Developer, you will be responsible for developing and maintaining the backend infrastructure of our applications, ensuring high performance, security, and scalability. You’ll work closely with the rest of the engineering team to tackle complex technical challenges and build solutions that can handle the unique demands of a crypto wallet app.\nCore responsibilities:\nDesign and implement scalable and robust backend services.\nDevelop APIs and integrate third-party services and Solana RPCs.\nManage databases (PostgreSQL, MongoDB) and ensure data integrity and security.\nImplement caching mechanisms using Redis for improved performance.\nWork with PrismaJS for efficient database access and management.\nDeploy and manage applications on cloud platforms (DigitalOcean, Google Cloud Platform).\nUtilize BullJS for background job processing and Cron for scheduling tasks.\nWrite unit and integration tests using Jest to ensure code quality and reliability.\nCollaborate with frontend developers and other team members to ensure seamless integration.\nStay updated with the latest trends and technologies in web development and blockchain.\nDesign and implement a microservices architecture for scalability and maintainability.\n Requirements:\nMinimum of 4 years of experience in backend development with a focus on web2/web3 technologies.\nProficient in Node.js, Express.js, PostgreSQL, MongoDB, Redis, and PrismaJS.\nExperience with cloud services (Google Cloud Platform, DigitalOcean) and DevOps practices.\nExperience with unit and integrations test using Jest.\nKnowledge of event-based architecture, microservices design patterns, and ability to design scalable systems.\nExcellent problem-solving skills and attention to detail.\nStrong communication and collaboration skills.\nNice to Have:\nFamiliarity with blockchain technologies, specifically Solana, is a plus.\nProficiency in machine learning concepts and experience in applying them to real-world problems.\nExperience in designing and optimizing backends to handle large volumes of data efficiently.\n You might not like it here...\nBut you might love it. Working at Solflare comes with trade-offs, and we’re open about them.\nCrypto moves fast, and our priorities can shift with it. We launch new features and rethink existing projects as our users’ needs evolve, in bull and bear markets alike. That means a project you expected to work on may give way to a more pressing priority. We understand this can be energizing if you can adapt and reset as you go, and frustrating if you prefer long-term predictability.\nWe also highly rate how people work together. Yes, individual work matters, but so does helping others succeed. We share responsibility for the outcome, and we share credit for the wins.\nOur remote-first setup gives you flexibility over how you work. It also means owning your role and proactively communicating with your team, not waiting for check-ins or constant direction.\nA Web3 background isn’t a must, but interest in Solflare and the industry is. Using the product, asking questions, and contributing ideas is part of every role.\nYou don’t have to prefer this setup. But understanding it should help you decide whether you’d enjoy working here.\nMillions already use what we build. Help shape what comes next. Apply below, or check out our careers site to learn more about our culture and benefits.","description_format":"text","description_chars":3941,"description_truncated":false,"requirements":{"experience_years_min":4,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Croatia","iso":"HR","kind":"country"},{"name":"Serbia","iso":"RS","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Crypto Wallets","Mining & Staking"],"lifecycle":[{"event":"open","at":"2026-11-04T14:15:45Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":42,"reasons":["conf:1","win:early"],"computed_at":"2026-11-05T01:57:23Z"},"pay":null,"html_url":"https://alion.io/job/solflare-backend-developer-5","json_url":"https://alion.io/job/solflare-backend-developer-5.json","meta":{"generated_at":"2026-11-05T01:57:23Z","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":2477,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-06T00:00:00Z"}},"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":2416},"rest":"https://alion.io/mcp/rest/get_company?id=2416"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsolflare-backend-developer-5"},{"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%2Fsolflare-backend-developer-5"},{"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%2Fsolflare-backend-developer-5"},{"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/solflare-backend-developer-5\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsolflare-backend-developer-5"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3748180}},{"tool":"search_jobs","arguments":{"company":"solflare.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3748180},"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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