{"id":98358,"url":"https://alion.io/job/solflare-backend-developer-4","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":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Zagreb, Croatia"],"countries":["HR"],"hiring_countries":["HR"],"hiring_countries_total":1,"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":"2026-07-17T09:56:07Z","employer_posted_date":"2026-07-17","last_verified_at":"2026-10-17T07:22:45Z","board_verified":true,"closed_at":null,"days_open":92,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":91},"description":"About us\nSolflare is one of the fastest-growing crypto wallets in the world. With around 4 million monthly active users and over $20 billion in digital assets secured through our platform, we’re building a powerful gateway to Web3. Founded in 2021, Solflare now has a team of nearly 150 people, with offices in Zagreb, Belgrade, and Novi Sad, plus remote teams across the globe. Our vision is simple but bold: a world where everyone uses a Web3 wallet and has full control over their assets - achieving true financial independence.\nOur culture\nAt Solflare, we’re on a mission to empower people to truly own and thrive - starting with our own team. We take on bold challenges with curiosity, grit, and a deep sense of accountability. Here, progress means learning fast, solving smart, and showing up for each other without ego. You’ll join a team where we question the status quo, celebrate shared wins, and never settle for “just good enough.” If you’re excited by growth - yours, ours, and society’s - you’ll feel right at home.\n The role\nAs a Senior 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.\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 Personality Traits We Value\nProblem-solvers: You see roadblocks as opportunities and don’t wait around for someone else to fix things.\nSelf-starters: You take initiative, follow through, and deliver with pride - no excuses, no shortcuts.\nTeam players: You thrive in a “we, not me” culture, lifting others up while sharing the load.\nAdaptable minds: You embrace change, question how things are done, and constantly look for better ways.\nOwnership mindset: You own your work end-to-end, communicate openly, and learn from every challenge.\nWhy Solflare?\nMake an impact: Your work will directly shape how people interact with and understand crypto wallets, empowering users around the globe.\nWork with the best: Collaborate with a talented, driven team across design, engineering, and product to build innovative, user-first experiences.\nFlexibility: Remote or office - up to you. Enjoy a flexible work environment based on trust that supports your well-being and fosters creativity, as well as flexible work time - work when you are most productive, with no micromanagement.\nPerks & benefits: individual education budget, cool team buildings, private health insurance, to name a few.\nLearn about Crypto: No crypto experience? No problem! You’ll be part of a team that will teach you the ropes and help you grow into an expert.\nJoin us at Solflare and be part of something bigger than yourself. We’re not just reacting to trends; we’re building the future. If you’re ready to push boundaries, challenge assumptions, and make an impact, we want to hear from you.\nApply now and help us shape the future of decentralized finance.","description_format":"text","description_chars":4673,"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":["Flexible schedule","Health insurance"],"hiring_locations":[{"name":"Croatia","iso":"HR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Crypto Wallets","Mining & Staking"],"lifecycle":[{"event":"open","at":"2026-07-17T09:56:07Z"}],"visa":[],"liveness":{"score":14,"band":"cold","label":"Long shot","p_open":1,"p_active":0.493,"p_room":0.28,"age_days":91,"expected_fill_days":41,"reasons":["conf:3","velocity","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/solflare-backend-developer-4","json_url":"https://alion.io/job/solflare-backend-developer-4.json","meta":{"generated_at":"2026-10-17T10:43:34Z","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":13970,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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-4"},{"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-4"},{"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-4"},{"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-4\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsolflare-backend-developer-4"}]}